RCA Victor -A new dog in the family...... It's Alive!!!!!!!!!!!!!

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Re: RCA Victor -A new dog in the family...... It's Alive!!!!!!!!!!!!!

Post by Bill Cahill on Mon Jan 28, 2013 9:19 am

Thanks. I just hope I'm not too deep over my head on this one. It is definately a challenge.
I know. There is a beautiful rare set on ebay that they had gutted, and, put a small rectangular ss color set in cabinet.
ARGH!
This set is definately a challenge.. Yes, I do seem to enjoy the challenge, but, I get real nervous trying these lemons.......
Boy, was this one a disastor!!!!!!!!
Bill Cahill

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Re: RCA Victor -A new dog in the family...... It's Alive!!!!!!!!!!!!!

Post by Bill Cahill on Mon Jan 28, 2013 8:27 pm

I've now replaced three more capacitors, and, two of them were shorted mica mold caps.
The resistor that is cooked is a 15K 1 watt resistor going to B+.
Bill Cahill

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Re: RCA Victor -A new dog in the family...... It's Alive!!!!!!!!!!!!!

Post by Bill Cahill on Tue Jan 29, 2013 1:02 am

Two more caps, or, is it another three, and, one electrolytic later, I tried it again to see what power supply would do........
I was rewarded with almost 40 volts of B+ at only 25 volts ac, but, rect. was getting very hot, showing me shorted parts are pulling alot of current.
I have manny more caps to go, and, eiight more in two cans near front, and, two low voltage ones underneath.
I've replace three of the five mica molds. They were shot............
It's producing a low bias voltage. I suspect too much current is going through bad electrolytics, and, paper caps.
No circuits are trying to warm up yet, and, I don't want that yet, either.
Bill Cahill

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Re: RCA Victor -A new dog in the family...... It's Alive!!!!!!!!!!!!!

Post by Bill Cahill on Wed Jan 30, 2013 6:16 am

Didn't feel well enough to work on set yesterday. Hope to today....
I think I'll stop posting here on it because there doesn't seem to be that much interest in the set. I understand. More of the same old, same old.
Just as a note, last night I cleanned height control again on Admiral.Was going to try set when I noticed some blind tech didn't properly solder one lead on a capacitor. I'll have to take set apart, and, re solder cap.
Bill Cahill

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Re: RCA Victor -A new dog in the family...... It's Alive!!!!!!!!!!!!!

Post by Guest on Wed Jan 30, 2013 8:09 am

Keep posting on it. There is interest.

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Re: RCA Victor -A new dog in the family...... It's Alive!!!!!!!!!!!!!

Post by Bill Cahill on Wed Jan 30, 2013 10:08 am

O.K. Today I will continue re building, and, then, see as it goes how power supply works. This is to see if there are any new problem areas, such as power transformer.
This set has been through hell, and, not sure what it will do on full power up after rebuilding.
Bill Cahill

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Re: RCA Victor -A new dog in the family...... It's Alive!!!!!!!!!!!!!

Post by Bill Cahill on Fri Feb 01, 2013 8:13 pm

Latest update on progress. See pictures. Crating higher B+ now. I'll be back on it tonight. I have 5 main electrolytics to go, and, alot of paper caps to go.













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Re: RCA Victor -A new dog in the family...... It's Alive!!!!!!!!!!!!!

Post by Bill Cahill on Sat Feb 02, 2013 1:33 am

Replaced more capacitors tonight. Found out a high voltage paper capacitor on horizontal output tube had shorted, and, exploded. One end was blown off. Big burned spot inside where it had blown. I see it was an insulation breakdown.
I have more caps. One more on damper, three more on osciltator, one more agc cap., vertical intergrator caps., radio caps., and, last three audio caps on top of chaasis. Then, finnish electrolytics. I think this old girl is going to play again.
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Re: RCA Victor -A new dog in the family...... It's Alive!!!!!!!!!!!!!

Post by Guest on Sat Feb 02, 2013 1:42 am

I'll bet that was a real show for whoever popped that cap!

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Re: RCA Victor -A new dog in the family...... It's Alive!!!!!!!!!!!!!

Post by Bill Cahill on Sun Feb 03, 2013 8:43 pm

Here are the most recent pictures of progress. Taken today, work done last night.














Notice closeup picture of corner tube soccket. Two particular capacitors. The one mounted on a terminal strip on bakc of chassis goes to horizontal output. Right next to the cahssis by output socket is the replacement for the .047 1KV capacitor that had exploded.
I have three more main filters, and, 15 more paper caps total to replace, yet, plus three low voltage caps., and, two known cooked resistors that had been burned by shorted caps.
This old girl is going to play, again.
Bill Cahill

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Re: RCA Victor -A new dog in the family...... It's Alive!!!!!!!!!!!!!

Post by Guest on Sun Feb 03, 2013 9:33 pm

Better and better.

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Re: RCA Victor -A new dog in the family...... It's Alive!!!!!!!!!!!!!

Post by Bill Cahill on Thu Feb 07, 2013 2:12 am

I'm slowly making progress. I have replaced nearly all the paper in tv. I have replaced two low voltage bias caps in tv. I have to replace some resistors, and, three last main filters, then, onto radio.
Then, last three pieces of paper on top of chassis on vol., and, tone controls. Then, test tubes, and, fire this baby up on variac. Waiting for parts to help finnish set. Hope to try it this week, but, not ready yet.
I know the last fire up at low voltage on variac, surge voltage went up to 80 volts.
That was at 50 volts ac input. Since then I've replaced more paper, and, five more electrolytics.
So far, no smoke, no pops, no bangs, no flames.
Bill Cahill Very Happy


Last edited by Bill Cahill on Thu Feb 07, 2013 2:18 am; edited 1 time in total

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Re: RCA Victor -A new dog in the family...... It's Alive!!!!!!!!!!!!!

Post by Bill Cahill on Thu Feb 07, 2013 2:14 am

Oh. I forgot. I still have to replace paper caps in vertical intergrator chassis, and, last agc paper on agc control in same sub chassis.
Bill Cahill

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Re: RCA Victor -A new dog in the family...... It's Alive!!!!!!!!!!!!!

Post by Bill Cahill on Sun Feb 10, 2013 10:42 pm

Haven't felt good the last couple of days, but, it's getting closer. I have one more main electolytic to replace, eleven more pieces of paper total, and, ONe low voltage electrolytic in radio. Then, I can start trying set in ernest..
I'll post more when I know more.
Bill Cahill

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Re: RCA Victor -A new dog in the family...... It's Alive!!!!!!!!!!!!!

Post by Guest on Sun Feb 10, 2013 11:36 pm

Always keep yourself going good first.

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Re: RCA Victor -A new dog in the family...... It's Alive!!!!!!!!!!!!!

Post by Bill Cahill on Tue Feb 12, 2013 4:15 am

Well, I'm coming 'round the bend. Two days ago, or, was it three?, I replaced last of hv electrolytics.
Tonight, feeling well enough to work again, re capped vert., and, agc sub chassis. Finnis! I only have radio, and, three caps on top of chassis to go, now.
I will start out slowly on initial fire up to look for any booboos I may have made. I will also make sure fuse in hv cage isn't blown.
I will be trying it very slowly. First power up, anything can happen.
Hope to try it say Wed.

Wish me good luck. I'll take pics either tommorrow afternoon, or, wed.
Bill Cahill

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Re: RCA Victor -A new dog in the family...... It's Alive!!!!!!!!!!!!!

Post by Bill Cahill on Wed Feb 13, 2013 2:51 am

Very bad news on tv. First, the horizontal output tube won't light. It appears socket has bammage from overheating.
Radio tubes, and, dial lights also won't light.
Now, the worst of it.
I'm getting 120 volts ac of leakage from line to chassis. I removed the bad line caps, and, reisitor, so, that's not it.
I pulled radio chassis to see if it was leakage on switch. Nope.
It's high enough leakage that my meter will only read it a secind, but, on voltage, I'm getting solid ac voltage, even with set turned off.
I have come to the conclusion the primary of power transformer has broken down insulation causing this.
When I put variac on eithty vlolts when I touch thge chassis, I get a strong shock.
Also, something is wrong with another tube socket.
All pins are very loosae, and, some tubes won't light in it.
So, at this stage of the game I need two tube sockets, and, a power transformer. Not good.
Bill Cahill

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Re: RCA Victor -A new dog in the family...... It's Alive!!!!!!!!!!!!!

Post by Bill Cahill on Fri Feb 15, 2013 5:12 am

I'm going to have to think this nightmare out. I spent two miserable days trying to try this set. I have the following added problems.
Sockets. One 6SN7 socket is worn out, and, I went to tighten socket pins, and, one broke off.
Horiz. out. socket worn. I tried tightenning all pins. At best, fil. lights when it feels like it.
5U4 socket. Old one fell apart. I replaced it. My replacement was bad, and, I didn't know it.
Re replaced it. Still having troubles trying to re wire it.
TV radio filament switch.
Apparently, worn out. Filaments in tv will come on, but, not on radio. Tried cleanning several times with no luck. Radio ca't play if tubes won't light.
Last straw. Power transformer has major leakage. It's putting line voltage on chassis.
I think I may quit, and, junk it.
I really have t think this one over.......
Bill Cahill

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Re: RCA Victor -A new dog in the family...... It's Alive!!!!!!!!!!!!!

Post by Bill Cahill on Sat Feb 16, 2013 11:59 am

Part of my problems should soon be over. I found, and, purchased a box of fifty brand new old stock wafer eight pin tube sockets. Should be coming in about a week.
Haven't touched set sine all the problems, though.
I had tried several times to clean the filament switch, not even knowing if any was getting inside because I can't see any type of opennings.....
I'm most concerned with the power transformer.
Bill Cahill

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Re: RCA Victor -A new dog in the family...... It's Alive!!!!!!!!!!!!!

Post by Bill Cahill on Mon Feb 18, 2013 1:55 am

O.K. After all the bad news, here is some good news........
First, on ebay Sat., I found, and, purchased a package of 50 brand new wafer 8 pin octal sockets.

Tonight, I dipped into radio schematic. I did the obvious, first, looked scjematic over, and, tried cleanning switches. That did no good, so I decided to fnnd the two parallel wired filament droppng resistors. Found them, and, put a temporary jumper wire accross them. GREAT NEWS! The radio tubes, and, dial lights LIT!!!!!!!!!!!!!!

Can anybody help me here? I need two .51 ohm 1Watt wire wounmd resistors.
The originals were the usual cheap wire wound white porcelin that RCA used in focus circuit, which was also open.
Now, I have to wait for the new tube sockets.

Bill Cahill

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Re: RCA Victor -A new dog in the family...... It's Alive!!!!!!!!!!!!!

Post by Tony V on Mon Feb 18, 2013 1:59 am

What about the transformer leakage...thats the biggie of the problems on this set.
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Re: RCA Victor -A new dog in the family...... It's Alive!!!!!!!!!!!!!

Post by Bill Cahill on Mon Feb 18, 2013 2:04 am

I'm looking on my junk chassis's. Hope to find one womewhere.
Bill Cahill

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Re: RCA Victor -A new dog in the family...... It's Alive!!!!!!!!!!!!!

Post by Bill Cahill on Mon Feb 18, 2013 7:39 am

I found I had two brand new .51 ohm resistors in stock. The only small problem was that The originals were one watt, and, mine are five watt. I barely got them squezed in. Tubes are now lighting.
Bill Cahill

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Re: RCA Victor -A new dog in the family...... It's Alive!!!!!!!!!!!!!

Post by Bill Cahill on Mon Feb 18, 2013 7:46 am

I wish to make a note here that may be of interest.
This is how the early switching systems work on RCA. For the tv, it's a simple on-off switch of higher amperage ability.
On radio, It's two wafer switches on two different sides connected in parallel. When you switch the rotary switch to tv, it shuts off voltage on radio filaments, and, connects tv filaments consisting of all tubes except damper, and, both audio tubes.Those tubes are connected all the time.
Bill Cahill


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Re: RCA Victor -A new dog in the family...... It's Alive!!!!!!!!!!!!!

Post by jerryhawthorne on Mon Feb 18, 2013 4:31 pm

+1 for Tony, Bill, have you solved your hot chassis problem? Would like to see you around for years to come. I gave up on working on TVs back in the 60s. I worked my way through college working for Warwick electronics which made TVs for Sears. I got to dislike the nice shocks one could get working on chassis that were plugged into my work station as they came off the line. I maned the first station opposite from the other side of a wide metal bench from the first lady on the other side. I got the sets that did nothing or ones with caps that exploded. Great position for me which really had no real training in repairing TVs. If I couldn't get a raster back in 5 minutes, off to the rack we had behind us. One had to keep up with the testing line. The rack was picked when the line had to shut down for some problem in manufacturing. Most of my few years there while going to UCLA for a degree not related to electronics, was working on their 19" black and white portables (if you were strong). The last year on their 23" color chassis. I really disliked them, they could sure bite! Get anywhere near the HV and they could pull the ashes off your cigarette.
In summary, I hate TVs! Now here I am many years later and back in the hobby liking old radios. Go figure. I admire you going after these old ones. Too complex for my old brain.
Nice thread and the frustration your having and following through on I'm enjoying. Your a better man than me.
Jerry

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