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  #46  
Old 06-17-2017, 11:32 AM
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This explains a lot... I made a string of resistors to measure the HV and by my calculations it's only outputting about 3.5KV. (Measured 80 VDC across the 1 meg resistor in a 50meg chain).

Flyback is almost definitely hosed then, despite not looking too bad. Makes sense given the higher resistance readings I got when I first tried to verify the windings.

Picture tube must be in pretty damn good shape if I can get a watchable picture at that low a potential.
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  #47  
Old 06-18-2017, 12:56 AM
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Personally, I wouldn't have hosed it down. Here, there are more chances of water left in the windings.
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  #48  
Old 06-18-2017, 06:43 AM
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Quote:
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Personally, I wouldn't have hosed it down. Here, there are more chances of water left in the windings.
Huh? I never did that...
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  #49  
Old 06-18-2017, 11:50 AM
old_coot88 old_coot88 is offline
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Huh? I never did that...
He's yankin' yer chain. "Hosed" = fubar, irrepairably shafted etc.
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  #50  
Old 06-18-2017, 12:57 PM
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Clearly that went over my head... Looking back I see I used that phrase.
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Flyback is almost definitely hosed then
Very punny
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  #51  
Old 06-19-2017, 10:48 AM
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Smile

That's what made me think that. Sorry. Thanks..........
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  #52  
Old 06-19-2017, 11:25 AM
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Originally Posted by Bill Cahill View Post
Personally, I wouldn't have hosed it down. Here, there are more chances of water left in the windings.
I've cleaned plenty of sets with the garden hose. It don't hurt anything, but I don't apply power for at least 3 days so it can evaporate.
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  #53  
Old 06-25-2017, 02:09 PM
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Good news, looks like my original fly is repairable. It rings out fine, so not shorted internally - just suffers from wax breakdown and arcing. I've got some corona dope now, I'll attempt to remove the old wax and give it a few good coats of dope.
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  #54  
Old 06-25-2017, 07:59 PM
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Be very careful. The windings are very delicate, and,Eacj Turn in it looks like ne wire, but, it's several wires are wrapped into little strains.
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  #55  
Old 06-25-2017, 08:06 PM
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Be very careful. Each winding of the insulated wire is several very tiny wires wrapped into It is done that way so they could weave them in, and, out so they could produce more high voltage.
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  #56  
Old 06-25-2017, 08:10 PM
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if it isn't already damaged the corona dope should be a big help...
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  #57  
Old 06-25-2017, 08:16 PM
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Quote:
Originally Posted by Bill Cahill View Post
if it isn't already damaged the corona dope should be a big help...
Sorry.. The latest page it gives me is page 4.
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  #58  
Old 06-25-2017, 08:22 PM
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Thanks for the warning. I did flake some wax off carefully to see how it went. I think it's probably safer to attempt to melt it off.
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  #59  
Old 06-29-2017, 08:24 PM
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The wax came off very easily (looked like very little wax for the size of the donut), and I found a possible culprit... there was a break in the HV winding about 1/2" from the anode lead. A bit discolored too; looks like that's where it might have been arcing.

There was also a fair amount of bubbling when the wax was melting. The other part of my problem may have been moisture ingress into the coil/wax. With the amount/time of heat given to get most wax off, it should be all dried out now.

Repaired the break, was a little tedious but not too bad. I never thought I'd be soldering something where the surface tension of the solder was going to be a problem

I've also given it a first coat of corona dope, will give it another tomorrow, and we'll see how it looks.

Things are promising!
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  #60  
Old 07-01-2017, 04:46 PM
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Back to the cleaning a chassis with water. Back in the mid 1960s, our organization bought a new Tektronix 'scope (one of those models with 42 vacuum tubes). Part of the purchase price included a class by Tektronix. The instructor started the class talking about cleaning the innards periodically with water. I don't think we ever cleaned it that way. Of course, I don't think the 'scope had a flyback made out of unobtainium.
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