Anybody remember my RCA Victor 6T74?

[ohohyodafarted]

Dosent look like you have much verticle amplitude. Have you unhooked one lead of the primary and one lead of the secondary, on the verticle oscilator blocking transformer and measured the DC ohms resistance. If either the primary or secondary on the verticle oscilator blocking trans is open, you will not get the correct signal to drive the vertical output tube which in turn drives the vertical output trans.

What do the waveforms look like going into the grid of the vertical output tube? are they the correct shape and amplitude?

Remember your scope knows all and tells all!

[wa2ise]

Originally Posted by Bill Cahill

I now have a bright horiz. white line accross the screen.
No vertical sweep, however....

I'm going to work oon vertical problem today....
I have a new yoke in it....

It could just be a bad or incorrect connection of the new yoke's vertical coils to the vertical circuits.

Be sure you don't run the set with much brightness without any vertical. Else you could burn a line in the phosper of the CRT.

[Bill Cahill]

Here's the only way I could get a picture in. Here is a picture from my photobucket album.


Bill Cahill

Can anybody help me here?
Polaraman, I'm making headway.

[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......


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

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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




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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

[Bill Cahill]

And, here is my prommissed picture.


Bill Cahill

[Bill Cahill]

Aw, common! When is it gonna end?????
For just a second, I had a tiny amount of vertical sweep, then, it went back to a straight line.
Now I have found out that my vertical hold control is burned out.......Yes, I've tried cleaning it with control cleaner.
Controls from junker, once cleaned, now check good. Guesss I'm putting those in.........
Bill Cahill

[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