Anybody remember my RCA Victor 6T74?

[Bill Cahill]

Actually, now open is more like flaky. I'm still going to replace it, but, I think something else is wrong. I suspect maybe vert. out. transformer may be shorted???

On yoke, this is an exact replacement RCA yoke. It plugs in to a socket on the side of hv cage.
I have now had to replace 15 out of 21 tubes....
I replaced bhe IF transformer I accidentally broke when chassis fell. It's fine. It actually plays better.
Bill Cahill

[Bill Cahill]

Some people have asked, so please see my new Avatar. This, folks, is my latest best friend added to my list of best friends.
This is Mike. He is a Chow mix with some Collie.
He is a very gentle, loving, kind dog, who is also well behaved..
John Folsom met him yesterday, and, ended up falling in love with him. Not hard considering hwo good Mike is.......

Now, on the tv.
John has given me alot of help on the last stumbling areas of the set, and, it looks like with some additional mods., the set will soon play again.
Unfortunately, this includes disconnecting the cathode from the filament of the orig. 6W4 damper socket, and, changing tube to a 6AU4. My new old stock 3,000 volt filament transformer failed, and, was arcing, and, blowing fuses.
Thank you very much for your help John. I look forward to getting it back playing soon.
Bill Cahill

[Bill Cahill]

Now my concern is whether to use it, or, not. I'm afraid it isn't going to be reliable now.. Any opinions??
Bill Cahill

[RetroHacker]

I'd trust it. I mean, it's half new parts at this point. It should be fine. Use it, enjoy it. I mean, what's the point in spending time and effort fixing something if you're not going to use it once it works? (Well, besides the fact that fixing things is fun). If you're just going to let it sit and never turn it on, then it might as well be broken like it was when you found it.

And, you probably have the circuit memorized at this point anyway. It will be easy to fix should something break. It should last for a good long time, and in the meantime, keep your eyes open for spare parts or parts chassis.

Use it!

-Ian

[Bill Cahill]

John Folsom reports in e mails to me he has neatenned up connections by me, someone else, and, company.
Mistakes were made by all, especially me.
He had problems with it also.
Couple nights ago it went with a bang, and, flamed out two resistors.
My 3KV insulation, new old stock fil. transformer for damper failed. It was arcing internally.
He showed me pictures of it playing last night. I don't like the coarseness of the picture, however.
It still has other issues, as well.
He's going to align it today.
Still think something else is wrong.
Anyway, it's progress. Thanks, John.
Bill Cahill

[bgadow]

My 721ts has this sort of problem with the vertical. Neither of the vert transformers test bad with the ohmeter. I've been through that circuit up one side and down the other 20 times and I still can't manage to trace it down. I can get sweep with an external source or by jumping a cap from filament to grid. I'm thinking of getting a new osc transformer just to eliminate it.

[Bill Cahill]

The primary resistance on the blocking transformer should be about 135 ohms, and, secondary, about 1 K ohms.

Check your vertical centering control. If that goes bad, you could also lose your vertical, and, that's a special 4 watt tapped pot.
Bill Cahill

[bgadow]

It seems like that pot had burnt out (too much current going somewhere) and I subbed in some wirewound resistors. Lots of screwy stuff going on in that set. I'm in no hurry to dig back into it!

[Tube TV]

Man , this reminds me of the fun I was last having with a 1955 General Electric utravision , which I still have to finish . It seems like when there was a change in the horizional frequency , it was also causing the vertical line to change . Is your RCA doing this ?
Bill , how is your horiziontal ? does it drop off to a lower frequency ?
Mine was constantly fluxuating from almost the correct freq to was below .
It was very intermittend , almost like a loose connection , or dirty tube socket ect. ect..
I have been over this set and still it causes me the same problems , except with slightly better vertical than you have right now .
Have you checked the resistors in the vertical oscillator ?
Also being that it effects both horizontal and vertical , Could it be in the sync circuit , and the vertical and horizontal oscillator circuits are being effected by a problem in there ?

Interesting , Hang in there Bill , one of these day your going to get it .

[Bill Cahill]

Vertical problem was caused by an open vertical oscilator transformer.
Unfortunately, following the same color codes for putting in new one proved a bad idea.
New one is normal. Red-Blue. Primary.
Green -Yellow, Secondary.

Then I found out from schematic RCA was goofy.
Green-Yellow, Primary
Red-Blue, secondary.

Had to have chassis at odd angle to replace trasformer. It slipped, and nearly fell on floor.
I grabbed it with both hands, and, saved it.
However, two tubes got knocked out with severely bent pins, fixed that, and, it broke the adjustment core in last video I F transformer.I now have to replace that!

I think this set doesn't like me.....
Bill Cahill

[Bill Cahill]

Let's see....
What have I got in this little gem now???
Chassis:
Electrolytics
Capacitors
Resistros
13 tubes out of 21
flyback
yoke
vert. osc. transformer
mica caps
some wiring
Some terminal strips for new filters
A few missing screws replaced
Power cord
Yoke.

Cabinet::
Picture tube
Sime missing screws
Alot of touch up time on finnish dammage
Re gilding plastic emblem on front
Two missing pieces of door hardware from a junker of same model
Cleaning, and, re lacquering door pulls.
Yikes!!!!!!!!!
I've got blood in this gem!!!!!!
:t ears:

[Tube TV]

Wow , more or less a new set

[Bill Cahill]

Hi, guys. Here's the latest on the tv, if interested......


Forums :: Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives :: Books :: Value Guide :: Wiki :: Radio Classifieds
Support This Site: The Souvenir Shop :: Contributors :: Advertise

Forum Rules/FAQ Search Usergroups Profile You have no new messages Log out [ Bill Cahill ]


Restoration continues on RCA Victor tv. See pictures........ Goto page Previous 1, 2, 3 ... 13, 14, 15

Antique Radio Forums Forum Index -> Antique Television Discussions
View previous topic :: View next topic
Author Message
HuggyBear
Senior Member


Joined: 31 Dec 1969
Posts: 4303
Location: Warren, MI, USA 48093-6744
Posted: Feb Tue 05, 2008 5:12 am

--------------------------------------------------------------------------------

Reminds me of that one Bugs Bunny / Yosimite Sam episode:

"I wonder if he's stubborn enough to open all those doors?"

BOOM!!

"Yep, he's stubborn enough!"

I don't think too many people would have been stubborn enough to finish that TV. you went past my stubbornness level months ago. I admire your tenacity and there's a lesson here for the world. I suspect success is closer than you think.

But - Not giving up is not the same as working way past when you should call it a day. Then you do things like miswire things, drop chassis, etc. Know when to say when, it will still be there tomorrow, nobody is going to take it away. Mike will make sure of that.
_________________
"I'd sooner tell Peter on the Last Day about the laffs I had given folks on Earth than try to explain to him about givin' them heart akes."
Cal Stewart, 9/22/1919 (b.1856-d.1919)




M3-SRT8
Senior Member


Joined: 07 Nov 2007
Posts: 66

Posted: Feb Tue 05, 2008 9:19 am

--------------------------------------------------------------------------------

Bill Cahill wrote:
In defiant response to a post in another post meant only for my own good, not as harrassment, here is my reply....
I will take??? off, and, I will be back on it. I'll finnish it if it kills me!!!!
While I admire the work done on the 630 in the other post, and, admire the proffessional work done, I am one stubborn old -6-65-54-=54-=5 of a person, and, I'll fix this thing if it's the last thing I do!!!!!
Thank you.
Bill Cahill


That would be Me.

I just hope it won't be the last thing you do. Everybody here, including Me, knows how good You are, Bill. I've received many good tips from You, and others on this Forum. Just don't let the damned thing do You in...

LJB




Don Cavey
Senior Member


Joined: 31 Dec 1969
Posts: 3457
Location: Baltimore, MD, USA
Posted: Feb Tue 05, 2008 10:39 am

--------------------------------------------------------------------------------

And, ladies and gentlemen, we are on page 15. Who was saying, "....
_________________
Don




Bill Cahill
Moderator


Joined: 20 Apr 2006
Posts: 2864
Location: St. Petersburg, Fl. US
Posted: Feb Tue 05, 2008 12:00 pm

--------------------------------------------------------------------------------

M3-SRT8 wrote:
Bill Cahill wrote:
In defiant response to a post in another post meant only for my own good, not as harrassment, here is my reply....
I will take??? off, and, I will be back on it. I'll finnish it if it kills me!!!!
While I admire the work done on the 630 in the other post, and, admire the proffessional work done, I am one stubborn old -6-65-54-=54-=5 of a person, and, I'll fix this thing if it's the last thing I do!!!!!
Thank you.
Bill Cahill


That would be Me.

I just hope it won't be the last thing you do. Everybody here, including Me, knows how good You are, Bill. I've received many good tips from You, and others on this Forum. Just don't let the damned thing do You in...

LJB


I won't. Thank you. Sorry for the rant. Bad day...
Waiting for some .47 mf 630 v caps to come later this week....
Set on hold until they come.......
Bill Cahill

Oh, Don.. Just going on back, and, forth on this thing. It's been a real thorn in my side.
I've come to realize this is now almost a new tv!
Bill
_________________
"Lady, I told ya don't plug it in with frayed wires!"

"What you mean I let the smoke out?"




y2k Bruce
Senior Member


Joined: 22 Nov 2007
Posts: 290
Location: Valrico Florida
Posted: Feb Tue 05, 2008 12:48 pm

--------------------------------------------------------------------------------

This TV of Bill's is well on its way to becoming one of the most famous ones in American history.

I am real tempted to buy this piece of history from Bill when he gets it playing just like a new one. He's just a short drive over the long bridge from me.

Bruce




Robert Howie
Senior Member


Joined: 21 Feb 2007
Posts: 323
Location: b4e3p4, halifax, ns
Posted: Feb Tue 05, 2008 3:55 pm

--------------------------------------------------------------------------------

Bill, you will have earned lots of bragging rights from this one

Me and others look up to you alot. I have learned alot from you and I wish i had 1/9th the encouragement and knowledge as you do, Good luck on the rest of the restoration

Thanks for all the great things you have taught me over the short time I've been a member here,

Can't wait to see a picture of it working, It is no longer a question of if, but a question of when...

All the best,
Robert
_________________
When life gives you lemons, make orange juice and leave everyone else wondering how the hell you did it...




Bill Cahill
Moderator


Joined: 20 Apr 2006
Posts: 2864
Location: St. Petersburg, Fl. US
Posted: Feb Tue 05, 2008 4:50 pm

--------------------------------------------------------------------------------

y2k Bruce wrote:
This TV of Bill's is well on its way to becoming one of the most famous ones in American history.

I am real tempted to buy this piece of history from Bill when he gets it playing just like a new one. He's just a short drive over the long bridge from me.

Bruce


Nope. Niet..
I have no interest in repeating this nightmare!!! Thanks for the compliments, guys. But, I make alot of mistakes, too, as my posts atest to....
Waiting on caps. May not be here until Friday, though...
If I get it playing, I'll not only show it playing on the test tube, I'll also show it playing on its' own tube.....
Assuming,ofcourse, it doesn't blow up.....
Bill Cahill
_________________
"Lady, I told ya don't plug it in with frayed wires!"

"What you mean I let the smoke out?"




antiqueradiobuff
Senior Member


Joined: 31 Dec 1969
Posts: 642
Location: USA
Posted: Feb Tue 05, 2008 5:06 pm

--------------------------------------------------------------------------------

Howdy Bill Miled out 4 .47 @ 630 voltz today should arrive by fri the latest is sat as i was told by the post office
thanks




hoffies2
Senior Member


Joined: 08 Feb 2007
Posts: 1117
Location: USA
Posted: Feb Tue 05, 2008 6:42 pm

--------------------------------------------------------------------------------

DAILY PLANET YEAR- 2028
READ ALL ABOUT IT!!
Local beach resident digs up an unusual item while metal detecting today.
It appears to be an old TV chassis that was buried deeply in the sand for 20 years.
Cause of death hammer blows to the anode, multiple lascerations to internal parts and what appears to be traces of napalm burns on the upper body.
Finder says this is truly the doings of a frustrated person but he will try and restore it to original being..
Reporter,
Jimmy Olsen




Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First

Antique Radio Forums Forum Index -> Antique Television Discussions All times are GMT - 5 Hours
Goto page Previous 1, 2, 3 ... 13, 14, 15
Page 15 of 15
Stop watching this topic

Jump to: Select a forum ----------------Antique Radio DiscussionsRadio ClubhouseAntique Television DiscussionsTransistor Radio DiscussionsCommunications ReceiversElectrical/Mechanical RestorationCabinet RestorationTest Equipment DiscussionsPhonographsHints & KinksOnline Auctions ForumHomebrew RadiosVintage Audio EquipmentOld Time Radio ShowsRadio Classified

You can post in this forum
You can edit or delete your posts in this forum
You can moderate this forum


Privacy Policy :: Powered by phpBB

Bill Cahill

[Bill Cahill]

Found at least one reason for popping Two resistors in horiz. output circuit were crossing each other. Looks like it happenned from all the mis handling over it's moving, etc.
Still may not have a good flyback in it. I had also been getting alot of corona, and, hv arcing.It appears the donut is failing. I now have a brand new flyback for it.
I think the reason vert. is still not running is because I have to reverse two wires on winding of vert. oscilator transformer. That should bring vertical back.
I accidentally destroyed the 4th video if transformer when chassis nearly fell on the floor. Replaced that. Set's working again, getting better reception than before.
If I can solve the popping, hv problem, vertical problem, and do re tuning, minor issue, I should have set working like new. Then, I'll be able to put it back together, and finnish final adjustments on its' own tube.
I now have put the original family table lamp on top of the set.
I'll get a picture of that.
Bill Cahill

[fujifrontier]

wow... just wow