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#1
12-19-2007, 06:19 PM
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Anybody remember my RCA Victor 6T74?
Well, after many months of hard work, several mis fires, a few shorts, etc..., here is the latest on it.
Tosay,, connected my test picture tube, speaker, etc., sired her up, and plugged into variac. The good news is I got good sound reception on channel 3 with a 3' lenghth of wire. The bad news is No hv, no vert. Sweep, And, maybe, no boost. I think this has something to do with when someone kept popping fuses, and put a 10 A fuse in it. Me thinks something significan't has been dammaged. That's all I know on it now. Bill Cahill 
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#2
12-22-2007, 03:02 AM
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That don't sound to good , Is that the set that was made in 1950 thay you were working on ?
How many secondary outputs on the power transformer ? Is it just a 6.3 filiment voltage and a B+ ? or are there other outputs ? What Im wondering if it could be possible that there is a power resistor that has died , or the ohms reading is to high ? Sounds like the B+ is OK for the RF IF and sound circuits , but not there for the oscillators or the deflection . I hope you get it sraightened out 
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#3
12-22-2007, 08:01 PM
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I would check for B+ voltage through the damper tube and flyback...remove the top cap from horiz output tube and carefully connect the voltmeter to the disconnected cap lead. If the flyback/damper are passing voltage there should be the B+ voltage present there and this means these components are likely OK.
If this checks out then check for a signal from the horizontal oscillator, check negative grid voltage at the HO tube and plate voltage at the oscillator tube etc. Also there is usually a damper fuse in this age of set so make sure that is OK too. The horizontal output stage/flyback need to be working to develop the boost voltage.
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#4
12-23-2007, 01:43 PM
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Been there, done that. Flyback checked shorted on flyback checker. I found one that barely checks in the green. I need a new flyback. Anyone got a new Fly 45 they can spare???
I simply replaced bad dampter winding with a new hv insulation 6.3 volt, 1.2 A transformer someone kindly gave me. All B+ resistors check good. I may also need a new yoike for this set. They used this set to death. Right into the ground. Out of 21 tubes, I also had to replace 10 tubes, and picture tube... I did get audio reception this week on 3' of wire. Channels 3,and,something on 12 came in. Bill Cahill
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"Tubes are those little glass things that light up orange unless there is a short.. Then they light up all pretty colors..." Please join my forum. http://www.tuberadioforum.com/
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#5
12-23-2007, 06:28 PM
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Quote:
One does not solve the problem of blowing fuses by putting in a higher rated fuse. 
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#6
12-24-2007, 12:36 PM
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Hi Bill
Moyer has a FLY-45. I've taken alittle break from my KCS-47A It's running with a few problems. Even though It's very watchable with a good picture. But will get back to it after the new year. Btw did you get that volume/tone control out for me? Terry
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#7
12-24-2007, 05:11 PM
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I have to check. I just found out they burned the tone control in mine. I'm beginning to think this set wasn't worth fixing. I'm not quiting after all I've done, but, if the truth be known, I'd say this one was totallly junk. I think 60.00 price was 55.00 too much..
Anyone have opiniions? Bill Cahill
__________________
"Tubes are those little glass things that light up orange unless there is a short.. Then they light up all pretty colors..." Please join my forum. http://www.tuberadioforum.com/
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#8
12-24-2007, 07:17 PM
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It's got desent cabinet mine don't
Terry
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#9
12-25-2007, 12:04 AM
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Well, that's the one saving grace. But, that isn't mint, either. It had alot of finnish flaking, and, I had to do some touch ups.....
It's not mint... Well, anyway, I have it semi playing, and, the chassis looks nearly like new, now. Hopefully, I'm getting closer now........ Thanks for the encouragement. Bill Cahill 
__________________
"Tubes are those little glass things that light up orange unless there is a short.. Then they light up all pretty colors..." Please join my forum. http://www.tuberadioforum.com/
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#10
01-01-2008, 08:20 PM
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Since I found my small supply of 1,000 volt silver mica caps, I am going to play it safe, and, also replace micas in horiz. osc., and, on sync amplifier. It don't hurt. I'm finding more, and more micas failing in this old stuff....I'll begin this project tommorrow. Moyer charged me 45.00 for that flyback. What am I? Crazy???? Yes! I found one that checks barely in the green, and, I'm trying it first. But, I'm replacing the mica caps, first.... Wish me luck. Polaraman, I'm not giving up. This set will play if it kills me, and, it might...... Bill Cahill
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"Tubes are those little glass things that light up orange unless there is a short.. Then they light up all pretty colors..." Please join my forum. http://www.tuberadioforum.com/
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#11
01-01-2008, 08:34 PM
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Bill,
I have that exact same set that I picked up in the summer. The cabinet is a little different on the doors but otherwise, the same model. If nothing else, your adventure with yours will serve as an invaluable educational tool to those like myself who have yet to dig into their version of this set. Keep plugging away, I know you will get it working! Roy
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#12
01-02-2008, 08:55 AM
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Quote:
Thanks. Bill Cahill
__________________
"Tubes are those little glass things that light up orange unless there is a short.. Then they light up all pretty colors..." Please join my forum. http://www.tuberadioforum.com/
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#13
01-02-2008, 09:01 AM
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Quote:
Today, I'm replacing mica caps..... Thanks again. Bill Cahill
__________________
"Tubes are those little glass things that light up orange unless there is a short.. Then they light up all pretty colors..." Please join my forum. http://www.tuberadioforum.com/ Last edited by Bill Cahill; 01-02-2008 at 09:04 AM. Reason: Forgot to ask a question.
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#14
01-22-2008, 10:23 AM
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Here's the latest on it...
Well, after replacing the 1B3 yesterday, which checked good, I got full hv. I now have a bright horiz. white line accross the screen. No vertical sweep, however.... Sound died again. I am getting two channels for sure, as I can see movement in the line. People movement, that is. Horiz. osc. is still un stable, but, I want my vert. back first.... May just be adjustment problems on horiz. osc.... I'm going to work oon vertical problem today.... I have a new yoke in it.... I'll post pictures when I get something more interesting than just a white line. Bill Cahill 
__________________
"Tubes are those little glass things that light up orange unless there is a short.. Then they light up all pretty colors..." Please join my forum. http://www.tuberadioforum.com/
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#15
02-01-2008, 10:20 PM
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O.K.
Don't know how to install the picture here, but, If anybody wants to see pictures of my latest point on the tv, please follow this link, and, scroll down to my latest pictures of tv playing. http://antiqueradios.com/forums/view...3266&start=240 I'm having some serious vertical issues, but, I have hv, and, a picture... Please take a look, and, help me if you can. Thanks. Bill Cahill
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"Tubes are those little glass things that light up orange unless there is a short.. Then they light up all pretty colors..." Please join my forum. http://www.tuberadioforum.com/
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