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tube42
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Post subject:  Posted: Oct Tue 16, 2007 4:28 am |
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Location: Leon Guanajuato, Mexico
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Bill Cahill
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Post subject: Posted: Oct Tue 16, 2007 4:31 am |
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Nice job on Motorola! What you do about rectifiers?
Bill Cahill
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Bill Cahill
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Post subject: Posted: Oct Tue 16, 2007 4:32 am |
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SWR
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Post subject: Posted: Oct Tue 16, 2007 6:27 am |
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Location: Chehalis, WA. USA 98532
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Bill Cahill wrote: Nice job on Motorola! What you do about rectifiers?
Bill Cahill
I have smelled first hand the rotten egg stench of a failed selenium stack so I always replace them and add a dropping resistor to get the voltage reading to spec.
I replaced the 2 original Selenium Rectifiers with 2 1N004 Diodes. The screw holes that held the original Stack is what I used to mount the terminal strips for the E-caps and diodes.
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Steven Reeves
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HuggyBear
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Post subject: Posted: Oct Wed 17, 2007 12:29 pm |
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MinnesotaHam wrote: Huggy: sounds like you might be a Warner Brothers/Looney Tunes fan?
Probably more so than Disney. But one of my all time favorites?
"Just what I always wanted! My own little bunny rabbit!" A wonderful Chuck Jones production from 1961.
http://www.youtube.com/watch?v=ceAwQUdDpco
"Poor old Bugs. But anyway you look at it, it's better he should suffer. After all, it was me or him and it obviously couldn't be me. Its a simple matter of logic. I'm not like other people. I can't stand pain. It hurts me."
---Daffy Duck
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HuggyBear
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Post subject: Posted: Oct Sat 27, 2007 1:24 pm |
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Location: Warren, MI, USA 48093-6744 N42.50973 W83.02633
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Bill Cahill wrote: Latest update..
I have traced where a broken wire that was coroded at the tip connects,and, will be re-connecting it, as well as re-replacing a capacitor I accidentally dammaged. Then, I'll be trying it again. Likely tommorrow......
I suspect I'll be getting further. I'm just not sure the fil. winding for the damper is safe any more. This set seems to have had alot of issues, and, manny years of use.....
The picture tube had been replaced with a new Sylvania.
Bought a small bottle of gold leaf paint, and paint brush. Re-gilded the name placque on the front of the control panel.So, that looks much better.....
Bill Cahill
It wouldn't be original, but...
I have several NOS Amprex 6CJ3 / 6DW4B damper tubes. It shouldn't be too hard to make an adapter to put a novar tube into an octal socket, split the H-K connection and ground the heater (or connect it to B+ if it makes you feel better). It's good for 350 ma, heater is 6.3v / 450ma. I'm not sure what the H-K voltage rating is, but I'm certain it is better than anything availible in 1950.
Or you could always do a hi-pot test on the damper winding of the transformer....
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Don Cavey
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Post subject: Posted: Oct Sat 27, 2007 4:19 pm |
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Bill Cahill wrote: Latest update...
I'm just not sure the fil. winding for the damper is safe any more. This set seems to have had alot of issues, and, manny years of use.....
...Bill Cahill
Bill,
Memories are returning of that same problem with my uncle's set. He had a similar set that had kind of a square box grid in front of the grill cloth and no doors. It had a metal cone kinescope.
Dad had that set on his bench for a couple of years working on it on and off. Don't know what ever happened to it...
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Don
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Bill Cahill
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Post subject: Posted: Oct Sat 27, 2007 10:45 pm |
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Huggy, thanks, but, no thanks. I like originality...
Don, Thanks for the understanding. Watch guys. In just a few min., I am going to show two more pictures. One shows my repair mod work on that corner of the chassis. Other shows a new view of front panel after re-gilding the emblem.. Let me know what you think. Thanks.
Bill Cahill Next job, try it again....... 
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HuggyBear
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Post subject: Posted: Oct Sat 27, 2007 11:06 pm |
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Bill Cahill wrote: Huggy, thanks, but, no thanks. I like originality... Bill Cahill Next job, try it again....... We're both a couple of originals, aren't we?
Very well then, hi-pot the power transformer if you don't trust it. It may not be cheap...or easy...but at least you'll know then.
Or take it out and have it rebuilt, specify the unusual insulation for that winding.
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Don Cavey
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Post subject: Posted: Oct Sat 27, 2007 11:10 pm |
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Bill,
And while they are re-winding that power transformer, don't forget to have them gold plate the bells. At what they may charge, the gold plating would be a drop in the bucket.
(Just fun'n!) 
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Don
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Don Cavey
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Post subject: Posted: Oct Sat 27, 2007 11:25 pm |
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You know, if back in the day when this set was about two years old, can you imagine repairmen and engineers at RCA visualizing anyone going to all of this trouble? I guess that is what we are all about.
I am doing yet another Scott amp and while taking out the coupling and bypass caps, I tested them all. All test 100% good, on value and no leakage. Did I replace them? Yes.
Bill, keep up the good work!
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Don
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Bill Cahill
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Post subject: Posted: Oct Sat 27, 2007 11:42 pm |
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Thanks, Don.
I must admit, I'm nervous on this one. First, this set has had a number of serious isses.
Secondly, my nerves are no to good any more due to all that has happenned in my life, physically, and otherwise..I just don't know what this puppy's gonna do.....
  
Bill Cahill 
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Bill Cahill
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Post subject: Posted: Oct Sun 28, 2007 7:09 am |
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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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Bill Cahill
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Post subject: Posted: Oct Mon 29, 2007 8:30 pm |
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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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Bill Cahill
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Post subject: Posted: Nov Sat 17, 2007 9:31 pm |
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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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Bill Cahill
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Post subject: Posted: Nov Mon 19, 2007 10:03 pm |
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O.K. I've now replaced the bad filament winding for damper with a new hv insulated power transformer. Just have a couple more things to do, then, I can try the set. I'll try the boost, first, then, try for hv.
Still no audio.
I'll post pics. when I have a new set availlable. I've only taken one more, so far.
Bill Cahill
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tube42
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Post subject: Posted: Nov Tue 20, 2007 2:56 am |
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Hey Bill\
Glad to see your updates!
Doesn't sound to me like this TV just "quit". Something bad must of happened.
Anyway hope to read more!
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Bill Cahill
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Post subject: Posted: Nov Tue 20, 2007 3:03 am |
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I'd have to agree with you on this one. Too many things wrong, including someone had put in a ten amp hv fuse. NOT good.
This set has had some serious issues.
Financially, I'm in over my head on this one.
Bill Cahill
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HuggyBear
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Post subject: Posted: Nov Sat 24, 2007 2:11 pm |
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Bill Cahill wrote: Legs. Aren't they wonderful? My legs were in bad shape yesterday, and after church, I went to bed.
My doctor prescribed compression stockings. What a difference. They're expensive, though. Quote: 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 But the yoke's on you!
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knobsrmisn
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Post subject: Posted: Nov Tue 27, 2007 1:59 am |
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Bill wrote, '[However, set still no worky. Remember, right now, I have vert., and hv circuits disabled.
I am trying to get audio, and recption from tuner. But, I'm getting absolutely NO output from the speaker]
IIRC some of the RCA's fed a horizontal pulse to the AGC tube so that could be a problem getting a signal without proper AGC voltage. 
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