This one was interesting. Spotted it at an estate sale on Friday (took a couple vacation days) but went back today on half-price day knowing it would still be there. And yep, it was. Got it for almost nothing :)

Pretty sure this set was a kit of some kind, but more accurately it looks like something used for classroom instruction on TV repair. Every control, every tube, etc is clearly labeled, even on the underside of the chassis. Picture tube is a 19GWP22. Even got a screen mask for the picture tube.

Powered up on a variac, it gets full sound, but almost no vertical sweep.....probably needs a standard recap. Lots of black cats underneath. But man this thing is built well. What it is exactly, not sure. What I'm gonna do with it, same answer :D

very cool nice find.

Looks like an RCA yoke housing.
Hows about a few part numbers off some diferent things & maybe
we can ID it. Looks like nothing I have ever seen.
Nice find......

73 Zeno:smoke:

"What am I gonna do w/it ?"... Like THAT'S ever slowed down or stopped virtually any of the membership of THIS forum...

Build a plexiglass cabinet for it maybe? That'll make it stand out.

Looks like an RCA yoke housing.
Hows about a few part numbers off some diferent things & maybe
we can ID it. Looks like nothing I have ever seen.
Nice find......

73 Zeno:smoke:

I can't find a part number on it ANYwhere. But here's some more pics.....

Couple more. See how it's labeled underneath as well?

Mystery chassis with a RCA yoke, where have I seen that before...

we had a 17" ge color yc chassis i believe with a plexiglass back. and extensions on the back of the plug in modules for making trouble so we could see the trouble and figure it out. that set played all day every day and had one of the brightest and sharpest pictures i have seen on a tv set from that era. it would have been a 1977 or a 1978 model. i would have loved to have that set i am sure it has been long gone for years.

this was a 2 year vocational college course i attended. tv
& radio repair

The pincushion transformer looks an RCA design too. I'd go over the tubes used and go from there to see what's similar. I'm not saying that it's an RCA but the circuitry may be derived from "patented" RCA designs..

It does an institutional look to it for sure. Interesting piece!

"What am I gonna do w/it ?"... Like THAT'S ever slowed down or stopped virtually any of the membership of THIS forum...

Ain't that the truth. :smoke:

The wiring underneath the chassis looks to be very clean and pristine for an older set - especially one from the tube chassis era. Most of the wiring in sets I work on it dusty, dirty and often cracked and slightly melted.

Are any of the circuits labelled on the chassis? It certainly looks like something used for training purposes, though could alternatively just be the product of a very thorough home handyman. :scratch2: I always label the tubes on the chassis when I work on a set, and if I were to build one from a kit, I know I'd take the time to properly label all the tubes, connectors and controls to assist in any future repairs or adjustments.

Chris

This one was interesting. Spotted it at an estate sale on Friday (took a couple vacation days) but went back today on half-price day knowing it would still be there. And yep, it was. Got it for almost nothing :)

Pretty sure this set was a kit of some kind, but more accurately it looks like something used for classroom instruction on TV repair. Every control, every tube, etc is clearly labeled, even on the underside of the chassis. Picture tube is a 19GWP22. Even got a screen mask for the picture tube.

Powered up on a variac, it gets full sound, but almost no vertical sweep.....probably needs a standard recap. Lots of black cats underneath. But man this thing is built well. What it is exactly, not sure. What I'm gonna do with it, same answer :D


That last picture you posted? It increased your Internet Respect Points balance by 1500. I doff my hat to anybody who actually rocks out in a workshop that has purple walls. Actually, it looks like you fed a "violet" color band from a resistor into the magic pigment-my-paint-this-color machine. :king:

Pretty sure this set was a kit of some kind, but more accurately it looks like something used for classroom instruction on TV repair. Every control, every tube, etc is clearly labeled, even on the underside of the chassis.

This tells me that the builder of this set owned a label maker and this set was made to be easily and quickly repaired.

This set reminds me of Johnny Cash's one-piece-at-a-time car, in that the building style reminds me of an early 1950's Conrac monitor, but the parts obviously are from the late 1960's or early 1970's and hint RCA design. I cannot understand why he wired the sweep with green hookup wire and the video with red wire.

Except for Heathkit, I do not remember any other color TV kits during the probable era and this is unlike the Heaths.

With that said, the best potential clue may lie in who built the printed circuit boards.

I noticed a couple of caps that seemed to be just tacked in and not properly mounted. Could this be a testing prototype for a limited run custom production, say a military or NASA contract?

James

Heh :D

My whole basement has purple walls. I keep all of my television madness to one room. And right now, the sucker is PACKED, much beyond my comfort level.

I put that old kitchen rug on top the Zenith roundie so the cats wouldn't try to jump on it and slide off and use claws to try to gain traction, but now it's their favorite place to sleep. Oh well.

And yes, that's only one angle :sigh:

I like that space age clock!

It maybe a "Arkay"color kit!, I have a Arkay B&W 19"TV kit built in 1964'
That I'm building from scratch I have the heater circuit done
And trying to find a isolation transformer before I complete it safely
Since it's series string 16 tube HOT CHASSIS!,I need one to complete
It!

A brewsky fridge right next to a bunch of TV sets, hog heaven for many guys. No giant flat panel for the big game, just fire up a bunch of smaller sets as a quick and dirty solution.

...

Nah. If I decide to restore it and keep it, I'll build my own custom cabinet for it. I'm not the best woodworker, but I DO know where there's an empty KCS47 cabinet I can get my hands on.....hm.....

i like it all.

You could always turn it into a built into the wall set.
Thinkin' about that the other day. In the early '60s when I was a kid the neighbors on either side of us and some other friends had their TVs flush mounted into the wall. One used a closet, another stuck into an adjacent room and another the chassis protruded into the garage. Not the best conditions considering the temp swings we get.

I can't find a part number on it ANYwhere. But here's some more pics.....
The pin transformer looks RCA but the part # isnt there style of either part # or drawing #. No EIA number on it either.
The date code is 23rd week 1971. It sure as hell is well built but
it may remain a mystery.

73 Zeno:smoke:

Heh :D

My whole basement has purple walls. I keep all of my television madness to one room. And right now, the sucker is PACKED, much beyond my comfort level.

I put that old kitchen rug on top the Zenith roundie so the cats wouldn't try to jump on it and slide off and use claws to try to gain traction, but now it's their favorite place to sleep. Oh well.

And yes, that's only one angle :sigh:

Now that is cool.

Made some room, sold the Curtis Mathis console stereo on CL this afternoon. Nice little profit. I'm finding that tube record players of any style in working order move pretty fast on CL....

With that said, the best potential clue may lie in who built the printed circuit boards.

After re-reading your post, I looked closer at the circuit boards.

The boards are VERY clearly marked with each capacitor value, and labeled with the banded side. Definitely a kit TV. Maybe a Conar or something? Who knows.....

One thing I did notice on power up was that the 6GF7 wasn't lighting up at all. Tests good on the tester too. Kind of flying blind in doing any kind of restoration on this set without a schematic, and I'm not even 100% sure the sucker ever totally worked....which is the problem with kit electronics.

Tubes are almost all RCA with the newer logo. UHF tuner is stamped MEXICO 0969.

Hm.

No PC board part numbers silk screened on the printed circuit boards? That would have been my hope of identifying the ancestry of the design. It smells like a low-volume training school kit, but I wouldn't have guessed they would go so far to make an unlabeled knock off of a commercial color chassis, and even less that they would design one themselves. That's a huge job.

One correspondence school (the name will come to me) used an unbranded (at least in their magazine ads) Heathkit, and I think later an unbranded Zenith/Heathkit that was less soldering and more snap-together.

COOL! I sure hope you get that set figured out. I love to tackle a mystery like that. It sure does look like some sort of training chassis . I wonder if it would do any good to browse some 60s/early 70s electronics magazines to see if a picture of that chassis shows up in the advertising for any of the technical schools of the day. Although it seems very unlikely, my thoughts keep wandering back to the idea of a homebrew set designed and built by some meticulous engineer.....Just for fun, of course.

Presumably the fasteners are all machine screws/nuts rather than rivets, right?

Correct....the boards are all screwed into place.

The knobs look a lot like the knobs on this NRI Conar TV kit:

http://books.google.com/books?id=8v2VW0V9p8wC&pg=PA33&lpg=PA33&dq=nri+kit+tv&source=bl&ots=ZMwaw1gZaQ&sig=aKsQWxbr8MDJe9Ewfvef9rA5Kp4&hl=en&sa=X&ei=om3WU-TDG8SDogSs64LAAQ&ved=0CB0Q6AEwAA#v=onepage&q=nri%20kit%20tv&f=false

The knobs look a lot like the knobs on this NRI Conar TV kit:

http://books.google.com/books?id=8v2VW0V9p8wC&pg=PA33&lpg=PA33&dq=nri+kit+tv&source=bl&ots=ZMwaw1gZaQ&sig=aKsQWxbr8MDJe9Ewfvef9rA5Kp4&hl=en&sa=X&ei=om3WU-TDG8SDogSs64LAAQ&ved=0CB0Q6AEwAA#v=onepage&q=nri%20kit%20tv&f=false
Me thinks the Conar is a Heath Kit.

73 Zeno:smoke:

Arkay kit

The labels look pre-printed, not something you would do yourself with a Dymo labeller or rubber stamps.. So I'd guess this was a limited run meant for instructional purposes, maybe for trade schools, maybe even made BY a trade school. Remember all those old ads in 1960s electronics magazines?

NRI was the National Radio Institute, a trade school of the 1960s. Their ads appeared quite often in magazines such as Popular Science, Popular Mechanics and one or two others. This color TV was included in one of their TV correspondence courses, although I don't recall ever seeing the cabinet included with the set. IIRC, most of these correspondence-school TVs were offered as the chassis only, meant to be installed in a custom cabinet or wall mount. Heathkit also had several TV kits for which the cabinet was optional, but was available directly from them for an extra charge.

Did just a base recap of the set, not including the filters. No change. No vertical sweep....the 6GF7 is still dark, and that's the key to the whole issue here I think.

Now, since I don't know what this set is and nobody else does either with any certainty, suggestions as to where I should go from here? I can do the filters, I just don't feel like it if that won't cure the issue :)

Normally right about now I'd start testing chassis voltages, but God only knows what this TV even IS to try to get a schematic for it.

Why don't you see if you can restore filament voltage to the 6GF7 and go from there? It shouldn't be tough to trace out even without a schematic.

Good luck, it looks like a fun project!

That's kind of what the capacitor replacement was about. There were a whole bunch of black beauties in that section that I replaced.

The problem is, in part, that I have no way of knowing if everything is even hooked up correctly or if there isn't something missing. Who knows if this set EVER worked.

Fun? Pfft. This is ten dollars worth of television hell :D

No vertical sweep....the 6GF7 is still dark, and that's the key to the whole issue here I think.
--------------------------
Normally right about now I'd start testing chassis voltages, but God only knows what this TV even IS to try to get a schematic for it.

Well, for sure you need 6.3 volts on the heater pins of the 6GF7 (Pins 4&5) perhaps a wire is poorly soldered or missing, or the tube socket pin is broken/corroded. I would get some juice to the tube heater and see what happens.

jr

Well, for sure you need 6.3 volts on the heater pins of the 6GF7 (Pins 4&5) perhaps a wire is poorly soldered or missing, or the tube socket pin is broken/corroded. I would get some juice to the tube heater and see what happens.

jr
Ditto that

:deal:

Hows about a few chassis pictures ? Maybe we could ID it.
Could be it never worked, not rare on kits. We wouldnt
touch one even if it worked fine. Definitely get the
6GF7 lit up before doing anything else. Oh if its on a PCB
watch for poor grounds too. Usually where the PCB solders
to the steel chassis.

73 Zeno:smoke:

I'll do that in a couple days. Out of a clear blue sky, my two boys, ages 11 and 14, have decided they want to get into TV and radio restoration like their dad and seem to have a voracious appetite for it. My 14 year old just recapped a Bendix 636C radio, and my 11 year old decided that he wants to take on restoring this Admiral 10" console that I was going to use for parts. I gotta say, these kids have some soldering skills....their work is pretty darn neat :)

We'll see if this lasts, but based on the last week, it just might. I think they're burned out of video games and are looking for a new outlet. Nick, my 11 year old, soldering iron in hand, said "you know Dad, now I get why you do this. This is FUN."

:D

There were a few Tech Schools, like the Conar, advertising kit TVs.
NRI in Scranton and Bell and Howell in Chicago.

Once it works, an RCA design that is hand-wired has to be an improvement.

Once it works, an RCA design that is hand-wired has to be an improvement.

There is a good TV repair quote if I've ever read one.

That's cool that the kids are wanting to get involved! My interest in TV and electronics came form watching our TV repair man(who was a family friend0 work on our CTC-40 (normally a bad power switch, and a UHF tuner or two as Youngstown has no VHF stations) Next get them started on old cars :)

99% of the time one end of the filament goes to ground.
If on a PCB GND usually tied to chassis by the board being
soldered in. If a kit may use nuts, bolts & star washers or
jumper wires to main chassis. Cold joints very possible either
place & the socket pins.
If hand wired it may use twisted pair. Most the time brown or green
wires used for filament.
If miswired just follow the hot end from a near by tube, put in a
clip lead to get the 6.3VAC to the 6FG7. Use meter to be sure you are
jumping the right voltage !
There were a few sets with most filaments in series & a few
in parallel, Maggy IIRC. If so watch for fuse or fusable links.

73 Zeno:smoke:

If miswired just follow the hot end from a near by tube, put in a
clip lead to get the 6.3VAC to the 6FG7. Use meter to be sure you are
jumping the right voltage !

This is exactly what I was thinking. Soon as I get some free bench space and a little more ambition, I'll get back on it. I gotta say that with all the radios and TVs I've been working on lately, I'm pooped out :sigh:

That's cool that the kids are wanting to get involved! My interest in TV and electronics came form watching our TV repair man(who was a family friend0 work on our CTC-40 (normally a bad power switch, and a UHF tuner or two as Youngstown has no VHF stations) Next get them started on old cars :)

Way ahead of ya! He's helped me wrench on several 1950s cars. First job he ever did by himself was last summer....he changed the front strut assembly on a 2004 Cavalier for a lady that needed help. All I did was tell him what to undo and explain how to do it, and he did! I just sat in a chair and watched :)

He makes me proud :)

Way ahead of ya! He's helped me wrench on several 1950s cars. First job he ever did by himself was last summer....he changed the front strut assembly on a 2004 Cavalier for a lady that needed help. All I did was tell him what to undo and explain how to do it, and he did! I just sat in a chair and watched :)

He makes me proud :)

I guess he takes after his mom, with hair and all....:D

I started out the same way with my Dad, 'cept I was the "Parts Sorter" - I knew my resistor color code before I even heard of a multiplication table.

Cars took me a lot longer to learn - had to blow an engine before I really got into them..

Back to the thread - there is a 1966 Conar Catalog online, but has only a B/W set. National Technical School was another school that had a kit TV, but they are sparse with details in the ads in magazines. CIE and CREI didn't offer any TV courses, and Bell and Howell offered up a tube B/W set, and later, a Heathkit solid state 23 or 25" set. Can't find any Arkay kit info.

FYI, most 1960's electronics magazines are on the web, and the entire Popular Mechanics/Popular Science library is on Google Books in "full" view.

www.americanradiohistory.com has most of the 60s Electronics Magazines online, save for PF Reporter and Electronic Servicing. Those "Radio Electronics" magazines have Jack Darr's TV repair columns, and lots of ads for schools, kits, parts and more!

Cheers,

I suspect this was a correspondence radio and TV repair school kit myself. Likely a NRI Conar, Bell & Howell, or similar which used an RCA or heavily RCA influenced chassis. Interesting set, would be neat to see it play again.

OH MY GOD !!!

THANK YOU for posting that site--I NEVER knew there was one wiht R_E and EW available to read on-line !! I LOVE Radio electronics--it was--and is--my all-time favorite electronics magazine !!

I LOVE Radio electronics--it was--and is--my all-time favorite electronics magazine !!

Same here - I've spent weeks on that website reliving my youth. My dad had a subscription from the 60's to the mid 70's, then my brother had a subscription, and then I had a subscription until it merged with Poptronix/Hands On Electronics. Electronics Illustrated, Elementary Electronics and Popular Electronics were newsstand buys for my dad - the Navy Exchange had them for a quarter back then.

Radio Electronics had the sexist tag line "For men with ideas in Electronics"
Popular Electronics had a female sailor (WAVE) on it's cover.
Electronics Illustrated had a bikini clad girl (ala Laugh-In) on it's cover in the late 60's.
Elementary Electronics had an article "the birds and bees of connectors" - all about male and female connector types.
Popular Electronics could be counted on for their April Fools column. (contrapolar energy - plug in the soldering iron and it freezes over....)

Ah, my youth....

Cheers,

Man i can't wait til my kids grow up and want to do these things I do. My 2 year old boy is already finding my dvm and turning the knobs. Lol
Tech is a big thing now with almost everything we have or do involves technology of some sorts, our children are growing up using computers and tables on an almost daily basis. My 5 year old daughter uses a Kindle fire in her classroom as a go along e reader.. very impressive when she can sit down, get on the Internet and go to a game website or go to youtube and click on one of her favorite cartoons.
It seems like just yesterday she was standing up using the tuner knob to hold herself up and pulled the power knob to turn on my old CTC-17.
Our kids need to learn this stuff. Soldering and board troubleshooting and repair. I'm teaching them all I can.

On the filament not lighting up, I have a magnavox combo unit that has a flaky vertical oscillator to e socket. Every once In a while I lose vertical deflection. I used deoxit and resoldered all pins on the socket. Problem solved. Check grounds!

Last night I showed Nick how to do the filter cans from underneath on the 1948 twin chassis Admiral 10" console he's restoring. He got a few of them done before I ran out of caps :sigh:

He's got all of the bypass caps done. Doing a damn good job too. His plan is to have the set done over next weekend so he can do another. We'll see what happens. I am DEFINITELY making a youtube video of this one :)

Great that you are getting the kids involved good job.:thmbsp:

Last night I showed Nick how to do the filter cans from underneath on the 1948 twin chassis Admiral 10" console he's restoring. He got a few of them done before I ran out of caps :sigh:

He's got all of the bypass caps done. Doing a damn good job too. His plan is to have the set done over next weekend so he can do another. We'll see what happens. I am DEFINITELY making a youtube video of this one :)

This sort of stuff at a young age can get you into Stanford. (Used
to be Harvard, but as New York Times comments, that's passe.)
It eventually got me there (Hahvahd, the r's had gone to Cuber).

I would recommend removing all this talk and photos (:eek:) of children performing dangerous tasks. I'm not saying that I will alert the authorities, but someone just lurking and reading threads might.

Children should be shielded from such danger. At a minimum the child in the photos should be wearing a helmet, safety glasses, knee pads, shin guards, etc. I once had a drip of solder splash on a bare shin, and it hurt very badly. Better that children should watch instructional internet videos and not allowed to to use actual tools until well into their college years. :thmbsp: Encouraging an interest in eco-unfriendly hobbies should be discouraged. It's horrifying to see such a young person turning wrenches (yeach!) on a non-hybrid, fossil fuel car. Hopefully there will be therapy.

Instead I would steer a child towards an interest in more useful careers, such as a deep knowledge of dinosaurs or methods of urban-farming hemp to produce sustainable cloth for processing in economically depressed regions.

As you can see, these children wear helmets. I highly doubt their eco-activities include using lead-based solder, or changing struts on a privately-owned fossil-fuel car. :sigh:

http://www.ecokids.ca/pub/assets/images/lndg_kids_bkg.jpg

The pincushion transformer pictured has a Warwick Electronics part number. With the "80-" prefix, it identifies it as a transformer. It would be interesting to see the part number on the Vertical output transformer and the audio output transformer - the transformer complement would lead to a Sears/Warwick chassis schematic (528.XXXXX chassis). Thordarson has a neat matrix that shows transformer part numbers vs. chassis. Could be useful.

It's not a ATR, Conar, or Heathkit, so maybe NTS, Devry?? Even Andrea, with their chassis that could be slipped into a custom cabinet, didn't use Warwick parts.

One thing is for sure - that is one puzzling TV chassis.


Cheers,

Same here - I've spent weeks on that website reliving my youth. . . . . . .

Popular Electronics could be counted on for their April Fools column. (contrapolar energy - plug in the soldering iron and it freezes over....)


Hee hee! The best impossible Pop Tronics April Fool's project was the one that we see very often today!

The solar powered nightlight!

Back then, economical rechargeable dry batteries and LED Lights had not been invented.

I had earlier done a solar cell project and remember looking at the schematic for about two seconds and thought "No way is that little solar cell going to provide enough amperage for that light bulb --." Then it dawned on me if there was enough light for the solar cell, one would not need the night light.

James

I would recommend removing all this talk and photos (:eek:) of children performing dangerous tasks. I'm not saying that I will alert the authorities, but someone just lurking and reading threads might.

Children should be shielded from such danger. At a minimum the child in the photos should be wearing a helmet, safety glasses, knee pads, shin guards, etc. I once had a drip of solder splash on a bare shin, and it hurt very badly. Better that children should watch instructional internet videos and not allowed to to use actual tools until well into their college years. :thmbsp: Encouraging an interest in eco-unfriendly hobbies should be discouraged. It's horrifying to see such a young person turning wrenches (yeach!) on a non-hybrid, fossil fuel car. Hopefully there will be therapy.

Instead I would steer a child towards an interest in more useful careers, such as a deep knowledge of dinosaurs or methods of urban-farming hemp to produce sustainable cloth for processing in economically depressed regions.

As you can see, these children wear helmets. I highly doubt their eco-activities include using lead-based solder, or changing struts on a privately-owned fossil-fuel car. :sigh:

http://www.ecokids.ca/pub/assets/images/lndg_kids_bkg.jpg


I SINCERELY hope--and PRAY--you were being "funny" in your post. Because..that is EXACTLY the attitude some people had towards me when I was about 13 or so." .Put it on the shelf...pick it up later on..You are too young to do this stuff. You don't know ANYTHING !! " And so on. And FORCING me to get rid of nearly ALL of the few things I had collected up to that point--including an Admiral M20--a set I have NEVER been able to find since , so was an Arvin 21-553 set--another set very difficult to fond today. !!

Such "support"--from people I THOUGHT cared about me...made it a LOT more difficult for me to enhance my knowledge. Had things been different--and a few of the people who COULD have helped me--actually DID so...who KNOWS how things might have gone for me !! I likely would have had a few things on the market by now and a few books published.

I APPLAUD the one who is teaching his children how to work on this stuff !! It WILL help them and get them a lot more interested in technical things....

If...and it is a big IF..my health recovers and things change in a major way for me financially...I DO want to help young people who have a technical desire--to not "slip through the cracks" ...As I did so many times...due to so many short-sighted people...

Hee hee! The best impossible Pop Tronics April Fool's project was the one that we see very often today!

The solar powered nightlight!

Back then, economical rechargeable dry batteries and LED Lights had not been invented.

I had earlier done a solar cell project and remember looking at the schematic for about two seconds and thought "No way is that little solar cell going to provide enough amperage for that light bulb --." Then it dawned on me if there was enough light for the solar cell, one would not need the night light.

James
I have now downloaded a WHOLE lot of RE , EW and a few other magazines from the site. I DO wish the years were complete--but some are not. But still--this way--it will be VERY easy to "take them along" with me--on a flash drive and have hundreds of issues to look through !!

I liked the self powered "Atomic Transistor" April fools article. I've got a number of original paper copies of those publications...

"A deep knowledge of dinosaurs'...yeah THAT is a great career to pursue...just like ALL of the liberal arts shit--that ends up being USELESS_-in the real world !!

And BTW_-those kids in that pix look like they are either stoned--or heading to detention !!

A solder splash will not hurt long--and it is part of this hobby-and career--that one has to learn to accept. Just as bruised knuckles are part of car repair...

"A deep knowledge of dinosaurs'...yeah THAT is a great career to pursue...just like ALL of the liberal arts shit--that ends up being USELESS_-in the real world !!

And BTW_-those kids in that pix look like they are either stoned--or heading to detention !!

A solder splash will not hurt long--and it is part of this hobby-and career--that one has to learn to accept. Just as bruised knuckles are part of car repair...

You are correct. I was using sarcasm to illustrate modern absurdity. I actually applaud people who teach their kids a skill vs. expanding their knowledge of dinosaurs and other useless crap.

I knew you had to be joking Carmine. lol good one. I feel a responsibility as a parent to teach my kids everything I know. Even if it's a little of everything, at least when I go I know I served my purpose as a parent.

I just got done fixing my father in laws Vizio 47" flatscreen again.. Bad fuse on the mainboard from it not used to "getting a break" for three years straight running, except today when it was unplugged due to reflooring the house, plugged back in and after a few minutes of me reconnecting the cable tv for him the tv went dead. Vizio's are crap, long story short my daughter watched me do it the whole time and was interested the whole time. She even helped screw back on the back panel.


Kamikari, did you look into that frankenset any further?

You are correct. I was using sarcasm to illustrate modern absurdity. I actually applaud people who teach their kids a skill vs. expanding their knowledge of dinosaurs and other useless crap.
Thank GOD ! You had me going but I didnt think a moon bat would
be in this crowd. But dont get me wrong. We do have our share of
characters but characters are cool.
I agree with the kids, teach them everything & dont worry about a
little risk.
Where I came from we had one of the top schools in Mass. I got
both my sons out fast & into trade school.
#1 son came out with a useful trade & also scored very high
on SAT WITHOUT prep, enuff to apply to MIT but we couldnt put together the $$$.
He did RCA CTC175 etal summers to go to collage. Degrees in
math & meteorology. Then USAF to Capt. Back to collage for his
masters, got it with some latin name.........
Same thing #2 son but only 1 yr of collage, bad experience.
Teacher from GB had open discussion in history class abt the
death penalty. He called us barbarians ! Son politely asked why he
was in a barbaric country. "Couldnt get a job ? the MONEY, or
something else ????". Instant F for the semester.
Dropped out, took an assy job & a year later production manager.
At lowest part of economy some Chinamen started coming around.
Put in apps & had 3 companies bidding for him. Now makes 3 times
what I ever did. It took 4 yrs............
Enuf of that, teach them everything give them lots of your time
& you will be rewarded in the best ways.

73 Zeno :smoke:

BTW not many make $$ on dinosaurs but they are cool & kids love them !

Instead I would steer a child towards an interest in more useful careers, such as a deep knowledge of dinosaurs or methods of urban-farming hemp to produce sustainable cloth for processing in economically depressed regions.

haw :D

That was great!

Reminds me of that commercial for that government website inventnow.org. The announcer says something like EXPLORE AND CREATE YOUR OWN INVENTION, and then in a hushed voice says "or you can just play some games"

Well played, you managed to steer in the Chris Griffins of the world too!

Instead I would steer a child towards an interest in more useful careers, such as a deep knowledge of dinosaurs

https://www.youtube.com/playlist?list=PLaCDmykyjVw_B983AQ2iGuZOA3ZLJ8Sry

Well, for sure you need 6.3 volts on the heater pins of the 6GF7 (Pins 4&5) perhaps a wire is poorly soldered or missing, or the tube socket pin is broken/corroded. I would get some juice to the tube heater and see what happens.

jr

Pin 4 seems to be the common heater voltage, it jumps between tubes. Continuity is good. Pin 5 goes to a disc cap, then to ground......

I could try replacing that disc cap I suppose.

https://www.youtube.com/playlist?list=PLaCDmykyjVw_B983AQ2iGuZOA3ZLJ8Sry

I can't (don't) watch any videos on my low-tech/speed interwebs service. But I did click, and I see the idea is that toy companies get the "facts" surrounding dinosaurs incorrect.

At the risk of straying further off topic, which I admit I may have caused, I hope I didn't touch any raw nerves by making fun of the American (perhaps worldwide?) obsession with dinosaurs. It simply irritates me because "dino-knowledge"; while utterly useless for 98% of the public, has become a go-to, safe subject replacing mechanical interests for children so predisposed.

As a child, I grew up with immigrant, depression-era adults who were intelligent, but had no clue what was popular for children in the mid 80s. That seems to be about the era when this push for the natural-world vs. man-made world began. Rather than using primitive spell-checks or speak & spells, I was forced to look up any word I misspelled in this old-timey thing called a "dictionary". Said dictionary was embossed with my grandmother's name as 1938 Detroit Spelling Bee champion, so you might imagine that poor spelling and grammar were not tolerated. I learned multiplication tables from flash cards. The only worthwhile public education I received came from my oldest teachers, the rest came at home.

Non-academic subjects were the domain of my grandfather. We didn't study dinosaurs. We fixed cars, lawn mowers, bikes, television sets & radios. We poured cement, finished basements, installed toilets, added electrical outlets, etc. I knew how to use a magnesium float before my friends could ride a bike. I learned all of this during the time my friends raised by hippie parents were watching MTV, listening to rock & roll, learning about dinosaurs and overall becoming good consumers of crap imported by the cargo-ship load.

As such, I find myself rather out-of-step with people of my generation. My sarcasm isn't always understood. When I see a kid who can do something useful at a young age, I tend to be shocked... but in a good way. It gives me a shot of hope for the future.

Pin 4 seems to be the common heater voltage, it jumps between tubes. Continuity is good. Pin 5 goes to a disc cap, then to ground......

I could try replacing that disc cap I suppose.
Dosnt make sense. assuming 4 is "hot" 5 should go right to GND.
Check ohms should be 0 at pin 5 to GND.
May be a miswire here. If not sounds like the SKT.

73 Zeno:smoke:

Dosnt make sense. assuming 4 is "hot" 5 should go right to GND.
Check ohms should be 0 at pin 5 to GND.
May be a miswire here. If not sounds like the SKT.

73 Zeno:smoke:
Gotta concur totally. That's assuming the heaters are parallel-wired and one side of the heater supply is grounded. If pin 4 is hot, then pin 5 has gotta go to ground.

I will go with the correspondence school theory. And on the 6GF7 filament issue, I would check for a miswire before anything else. Great find, as I'm sure most of those sets were junked after completing the class (or giving up :nono: )

Charles

Sadly Carmine, there are a lot of parents with that mentality (heck my dads folks would not let him try to repair a radio as a kid because it 'could be dangerous'), and those that raise their kids like that are what is filling our world with "middle men and phone washers" rather than "thinkers and doers" (hitchiker's guide to the galaxy quotes)...

If not for taking on this hobby at an early age I'm sure I would not be an electrical engineering major (well on his way to graduation)...It's scary to think about how I'd have likely turned out without my hobbies.

I'm glad Carmine was just being the anti-repair guy. Had me going there for a minute.

I started messing around with old radios around 1963, when I was seven.

I replaced a picture tube in a B/W GE console when I was nine, with my dad's help... he helped me sit the CRT in the mask properly, then I took over.

Started doing basic TV repairs for friends of our family when I was eleven.

Got a parts account at the local electronic parts jobber when I was fourteen.

Got a $40 car, a 1960 Dodge, and learned from it by taking it apart and putting it back together again. Today I do almost all of my own auto repair. My mom loves this, as she has never had to take a car to the shop with ME around.

If it had not been for my dad, and my uncle Wayne showing me the basic ways to use tools, and work on electrical things, I sincerely don't know what I would have wound up doing for a living for all of my work career.

I really wish that had been my case.

But MY dad was in sales--and He DIED--when I was 7 years old.

This left my mom to take care of me and my sis. she di her best and I am very proud of her. She did her best to understand--and tolerate--my special interests.

However--some people who COULD have helped me to learn more--and even get into this field early--did NOT help me. At least one was a tv repair man, and for a VERY short time--it looked like he would "take me under his wing" , but he did NOT do so. Another was heavily into computer technology--he too had a chance--but passed on it for whatever reason.

A few even tried to PREVENT me from doing this sort of thing--trying their best to convince my mother to force me to "stop messing around with old tv sets and such". For a short time--they nearly succeeded. But after a short time--mom realized better.

So--I am m mostly self--taught. I had a BIT of help, here and there, but nothing consistent. Then I earned 2 degrees in college--one of which--my AAS degree--HAS helped me to 'get in doors"..

Gotta concur totally. That's assuming the heaters are parallel-wired and one side of the heater supply is grounded. If pin 4 is hot, then pin 5 has gotta go to ground.

I screwed up. It does go to ground. It's hard to raise the chassis up with the picture tube in it, but I got a better look this morning. Going to check continuity on the pins of the tube with the tube pulled out slightly and see where I'm at.

Everything has continuity that should, with the tube pulled from the socket of course. Powered the set up and with the tube elevated slightly in the socket, I get squat for voltage on 4 and 5. Nothing.

Hm.

Perhaps *really* clean the tube socket pins well. Can you prop the chassis up slightly and try to measure the voltage at the bottom of the socket? * Is it a wired or printed circuit connection from the tube base to the source of heater voltage? I assume that you are indeed counting the pins correctly and the correct tube is installed.

jr

edit add:
* perhaps tack solder a couple of wires to the socket, and bring out for measurement?

The tube is correct according to the sticky label on the top and on the bottom of the chassis. I measured voltage topside....all I did was bring the tube very lightly up out of the socket, just enough to get meter probes in there. And the socket pins are numbered :)

Suppose I could prop the set up and measure from underneath, but right now my son Nick and I are finishing up the Admiral 10" :)

Why dontcha try this:
With the set off, remove the tube. Working from the top side of the chassis, stick the meter from ground into lug 5. It should show zero ohms, indicating solid continuity thru the socket to ground.

Do the same thing to lug 4. It should show nearly zero, a small fraction of an ohm (from the paralleled tube heaters and heater winding, to ground).

If you get an open on either lug, that'll show you which track to pursue to find the open condition.

I suspect this fault is why the project was abandoned.

Pin 4 seems to be the common heater voltage, it jumps between tubes. Continuity is good.

Just a WAG, but I suspect that the wire that is connected to pin 4 is *incorrectly connected* at the other end.... what tube and what pin of that tube does it connect to?

This is a real head-scratcher!

jr

Don't discount a bad (open pin) on the tube socket. Predictas are especially prone to this, and it is a possibility in any make/model set.

If its the socket you can bend in the contacts from the top
with a jewelers screwdriver for a temp repair sometimes.
Works good often for sockets that wont clean.
Some sockets you can also replace one pin to fix.
At the next ham flea market look for a set of test sockets,
they plug in between the tube & chassis & have test points.
And dont forget count CW from bottom, CCW from top.

BTW One of the biggest dogs we had was a vert socket.
Maggy color no vert sweep. Road man tried tube then pulled
chassis. I jigged it & poked at it for days, got nowhere.
2 part time EE's tried & 2 other techs. Finally we gave up, it
beat us. I told the shop idiot to wrap it up to send it to a
Maggy dealer. When he went to put the origional tube back
in the end of a pin was on the tube pin. A new socket fixed it.

73 Zeno:smoke:

Tim, I hope you still have this kit TV set. A good friend of mine just gave me an unbuilt tube color-TV kit, and it is likely the same one that you have. I compared things such as part locations on the convergence board and some of the tube layout and numbers on the chassis from your pictures, and they match.

Your set is likely a CTV-20-K made by Commercial Trades Institute in Chicago, Illinois. I have not yet checked everything that I have, but it might include full documentation of the set if we are lucky. The bad news is, we did not yet find the main chassis for this kit. But, I do have the CRT and, with luck, all of the other parts of the kit, as well as most or all of the original lessons and exam materials that were apparently spread over 20 segments, each with its own board or other set of parts as the kit as built. Mine is from late 1973, from the dates on a few of the parts such as the UHF tuner. That is VERY late to be selling an all-tube color TV set, but the logic was probably "This is what your customers will be bringing in for repair". If you never did fix your set's vertical problem, maybe I can find the schematic or other information to help.

How did I find your three-year-old discussion? I did a Google search for the 19GWP22 CRT in the kit. (-:

And to answer one question or comment from the original discussion, the labels were indeed part of the kit. "Practical Assignment 9KC" includes a decal placement sheet for the top and bottom of the chassis. It matches Tim's pictures.

Arkay kit

Eartha Kitt! :D

Unfortunately I don't still have it. In fact, I don't even remember who I gave it to ???

OK, well maybe its current owner will see this discussion and make a comment or two. Thanks for the update.