Saga on Restoration of RCA Victor tv stillgoing strong.

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Re: Saga on Restoration of RCA Victor tv stillgoing strong.

Post by Bill Cahill on Sun Apr 14, 2013 11:23 pm

Storms prevented me today, but, trhied for ac power tonight. Power trans. appears good.
Tubes light, lights light, power trans. didn't light. Good news.
There appears to be minor leakage from primary to chassis, however.
I'll be doing more testing tommorrow, weather allowing. Bill


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Re: Saga on Restoration of RCA Victor tv stillgoing strong.

Post by Bill Cahill on Sun Apr 14, 2013 11:25 pm

Just about ready to try tv. Pulled hv fuse out to disable it the way I always do on my first real try. Scary. This set uses a quarter amp fuse, and an idiot had put in a 10 A fuse!!!!!!!!!!!

Bill Cahill


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Re: Saga on Restoration of RCA Victor tv stillgoing strong.

Post by Bill Cahill on Sun Apr 14, 2013 11:29 pm

Well, I was going to try it tonight, but,now I lost my all important yoke. I need it because it has the jumper from rect. to first filter. Shoot.
Bill Cahill


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Re: Saga on Restoration of RCA Victor tv stillgoing strong.

Post by Bill Cahill on Sun Apr 14, 2013 11:30 pm

Legs. Aren't they wonderful? My legs were in bad shape yesterday, and after church, I went to bed. Now, I've found yoke, and am thinking of a power up today after getting rest of day's chores caught up...
Hoping I get it playing.
Bill Cahill


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Re: Saga on Restoration of RCA Victor tv stillgoing strong.

Post by Bill Cahill on Sun Apr 14, 2013 11:32 pm

Back on the set after a day checking picture tubes..
Decided to bite the bullet, and start trying hv circuits first.

I am going to install a new hv insulated fil transformer for the damper. After cleanning things up, I'll put the correct fuse back in, and, first, with horiz. out. removed, try the boost, and vertical circuits. Upon success with that, I'll try for hv. When I have some sort of picture on it, I can turn back to my audio problem.
Bill Cahill


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Re: Saga on Restoration of RCA Victor tv stillgoing strong.

Post by Bill Cahill on Sun Apr 14, 2013 11:37 pm

I'm going to check on a couple more things. I may even test the flyback. Then, I'll start powering up the set again.. Plan on doing this today, barring any more disastors.... Wish me good luck.....
Bill Cahill
Who knows? If I get a picture on the bench, I may even snap a picture of it......
Bill Cahill


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Re: Saga on Restoration of RCA Victor tv stillgoing strong.

Post by Bill Cahill on Sun Apr 14, 2013 11:40 pm

Been neatenning up wiring while awaiting parts. Checked toen control pot. It's not actually open, or even flaky, but, according to RCA it should be 2.5 M. It actually checks 3.5 M.Hmmm. I left it in for now. Found a mechanical short in tone circuit. Fixed. Resistors off loudness control to tone circuit are correct in value.This set actually has a loudness control because it has two tone taps. Not bad for a tv...

I replaced micas in horiz. oscilator, and, sync circuits.

I'm leaving micas in IF circuit alone for now because I was getting audio reception....
I suspect that even if I still have to replace yoke, and flyback, I'm getting closer now....
Bill Cahill


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Re: Saga on Restoration of RCA Victor tv stillgoing strong.

Post by Bill Cahill on Sun Apr 14, 2013 11:44 pm

Tech notes:
Good, and bad news....
I now get some hv, and, a very dim something in one corner...
Both sides of horiz. very short. I only see slight life out of vertical.I see picture flashing when I change channels, and, controls in front are all making a difference in what I see on my test tube. I'm going to check hv with my hv meter, then, try another 1B3. Then, I may play with the horiz. osc. slug, and, horiz. lin. slug....I think boost is very low.... I have no present means to check waveforms, which makes it alot more difficult....
I have also again lost my audio reception, though I'm still getting a slight audio hum in the speaker..
Arggh, this set has problems!!!
Bill Cahill


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Re: Saga on Restoration of RCA Victor tv stillgoing strong.

Post by Bill Cahill on Sun Apr 14, 2013 11:46 pm

These top notes I am saving here are from original locked thread at ARF. I am trying to save the archives.
Bill Cahill

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Re: Saga on Restoration of RCA Victor tv stillgoing strong.

Post by Bill Cahill on Sun Apr 14, 2013 11:49 pm

Music, please.... Ladies, and, gentlemen, here's the latest.
I have now replaired several problems in the vertical circuit, and, have decided it's time to replace the way off value resistor on the horiz. output cathode. The original was a 100 ohm, 2 watt resistor that had gone up to 150 ohms. That's not a killer yet, but, I'm taking no chances, so, today, I'm replacing it.. I then plan on again trying the set.. Only thing is I just ate a bannanna after taking my blood pressure pill, and, of course, my stomach is furious!

Now, ladies, and gentlemen, stay tuned during this station break for "The tv that wouldn't die"! BRooohhhahahahahahahahaha........

Gee, isn't this somewhat like a sci-fi movie? Sort of like "Fiend without a face", isn't it????
Bill Cahill


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Re: Saga on Restoration of RCA Victor tv stillgoing strong.

Post by Bill Cahill on Sun Apr 14, 2013 11:51 pm

Argh, what a day!!
My 75 watt light bulb burned out today, and, I had to get one from a kind neighbor. I'll be swhopping for new bulbs later next week..
Went to cut resistor out. First lead, simple.
Second lead, oops, cut a half watt resistor lead going to same pin.
Tried again. Got it!
Got first lead connected, tacked. Went to solder other end. Problems.
Decided to pull out horiz. output tube. Oh, great! The plate cap fell off the tube.
Time to repair that...
Cleaned old lead of corosion.
Connected a wire, and soldered it.
Cleanded solder off cap, put wire through it, soldered it in place, and, cut excess off.
Tube's back in..
I am nearly ready to put set back down, set it up, and try it again....
Bill Cahill


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Re: Saga on Restoration of RCA Victor tv stillgoing strong.

Post by Bill Cahill on Sun Apr 14, 2013 11:54 pm

That concludes Page 8 of the locked post.
I will be copying more as time permits. After I get to point of photos, I'll edit posts here, and, copy photos out of my folders.
Bill Cahill

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Re: Saga on Restoration of RCA Victor tv stillgoing strong.

Post by Bill Cahill on Mon Apr 15, 2013 5:34 am

Last night I finnished replacing the resistor on the horizontal output..Still getting strange resistance readings, but, I'll ignore that for now..
Today, found another short. My fault. Fixed. I then turned my attention to the audio output. I just discovered I have an intermittent open on primary of audio output transformer. OH, boy....
I'm stealing another transformer.....
What else can go wrong????
Bill Cahill


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Re: Saga on Restoration of RCA Victor tv stillgoing strong.

Post by Bill Cahill on Mon Apr 15, 2013 5:36 am

Nope. Not fixed. Still no audio, and, still no vertical sweep. Guess I'll have to start checking voltages.
Bill Cahill


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Re: Saga on Restoration of RCA Victor tv stillgoing strong.

Post by Bill Cahill on Mon Apr 15, 2013 5:38 am

After several failed attempts to get vertical, and, audio, I decided to study schematic tonight.
Well, it's not a power supply problem. Here's why..
Sync amp runs off the 250Volt source, as does the First audio.
However, so does the video if strip.
Now, Cathode circuit of the audio output run off the 120volt source. However, so do the brightness, and contrast circuits. They are also working fine.
In the vertical, that leaves the vertical oscilator transformer, and, in the audio, who knows???
Perhaps my new .003 plate bypass cap on audio outpurt haqs shorted?????
I'll do tests tommorrow in those circuits...
Bill Cahill


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Re: Saga on Restoration of RCA Victor tv stillgoing strong.

Post by Bill Cahill on Mon Apr 15, 2013 5:40 am

Checked some resistors. I foound one slightlyencouraging onevery bad, and, one slightly off.
330K half watt B+ 1st audio.
Checked about 470K, with some jumping around.
May not be a sound killer,but, it won't allow much volume, either.
470K half watt. Audio output control grid bias.
This one actually went down to 407K. I'm replacing it.....
Bill Cahill


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Re: Saga on Restoration of RCA Victor tv stillgoing strong.

Post by Bill Cahill on Mon Apr 15, 2013 5:42 am

Will Mr. Murphy please stand up, and, LEAVE?????????????????????????????/

I found my audio problem!!!!
Are you ready for this?
Are you sitting??
Are you sure you want to know?
Are you really sure you want to know?
Well, you asked for it.
Here it comes!!
Scroll down...
.......
......
.......
This set has an open, shorted volume control!!!!!!!!!!!!!!!!!!!!
The element is burned out.
When you turn it up, it gets a 59 ohm short from the center tap to the chassis....
The tone control is also dammaged..
Here's what I figure likely happenned....
O.K., you fools that want original capacitors in stuff..Listen up.
This set died in the early 70's, according to the owner's daughter.
There is a coupling capacitor from the plate of the 6AV6 to the tone control.
The ends of the tone control connect through resistors, and, a capacitor to the taps on the volume control.
That capacitor likely shorted, allowing B+ on tone control.
That put B+ on volume control, which didn't like it.
It burned. The tone control is also dammaged...
I never could get much volume on the set. Now, I know why. It just finnished self destructing with normal turning....
It's gonna take at least a day to replace the entire assembly.
Bill Cahill


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Re: Saga on Restoration of RCA Victor tv stillgoing strong.

Post by Bill Cahill on Mon Apr 15, 2013 5:44 am

Well, I'm back on an even playing field. I am now getting Some reception in audio. Not as good, though. Now, the tuner is touchy, and, way out of tume. But, I am sort of getting three stations through speaker on 5' of wire......

I'm going to do some resistance readings in vert. osc. Then, I'll reconnect my pix. tube and, re activate hv to see what it does.
Bill Cahill


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Re: Saga on Restoration of RCA Victor tv stillgoing strong.

Post by Bill Cahill on Mon Apr 15, 2013 5:47 am

Well, I have good news, and, I have bad.

Got my audio back.
Found part of my vertical problem. My "Good 6SN7 vertical oscilatro tubes, both of them, were bad.
I now get Some vertical. Here are two pictures of what it is now doing.....


And, here it is with vert. hold control turned the other way.


Vertical hold is acting more like a height control.
My horiz. is still having phase issues, but, vert. is so far off frequency that it is running up very fast.
Bill Cahill


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Re: Saga on Restoration of RCA Victor tv stillgoing strong.

Post by Bill Cahill on Mon Apr 15, 2013 5:50 am

I've done some preliminary tests on vertical oscilator transformer. It shows to be completely open. I just don't see how it can work at all with an open transformer...
I'm going to check the transformers in the junk chassis's. The picture tube isn't causing the short height. The vertical should still fill that screen. The vertical oscilator is way off frequency......
Bill Cahill


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Re: Saga on Restoration of RCA Victor tv stillgoing strong.

Post by Bill Cahill on Mon Apr 15, 2013 5:53 am

Well, I am looking forward to the day I'll be watching vintage tv on it.
Now, I feel like a song.. Sung to the tune of M-o-t-h-e-r.
I dedicate this song to the original family set, and, this one..


S is for the many shocks you gave me..
H is for the time it really hurt.
O is for the ouch that I felt when my my head hit the basement wall
R is for the rage that I felt.
T is for the time I threw it out..
Put it all together, and, what do you have?
You find you have got a short!


Words, and feelings by:
Bill Cahill


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Re: Saga on Restoration of RCA Victor tv stillgoing strong.

Post by Bill Cahill on Mon Apr 15, 2013 5:57 am

Quote from Oldsmobile Man

There is only one way to sum up your hard work...
Sir, You are the GOD of tv and patients


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Re: Saga on Restoration of RCA Victor tv stillgoing strong.

Post by Bill Cahill on Mon Apr 15, 2013 6:01 am

Quote from Oldsmobile Man.

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


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Re: Saga on Restoration of RCA Victor tv stillgoing strong.

Post by Bill Cahill on Mon Apr 15, 2013 6:10 am

Ah. Here it is. I now have my mother's repaired table lamp on the family tv where it belongs.....

Bill Cahill


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Re: Saga on Restoration of RCA Victor tv stillgoing strong.

Post by Bill Cahill on Mon Apr 15, 2013 6:12 am

Quote from radio rich

Hello Bill
Heck thats sure a nice lamp and one of my either hobbies is restore lamps I few diffrent lamps laying around the house far as my antique Ge 1957 console theirs this tv lamp that Im planing on using with mine I'll take photo of it . also it will be great to beable to start work on my 1951 Philco 12in b/W bakelite .
sincerely Radio Rich
P.S. can't wait to beable watch some of those old classis sitcoms on dvd


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