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In Reply to: RE: Fisher X-101-B posted by reuben on June 04, 2024 at 18:30:56
Excessive heat causes the winding insulation to melt and short out.
Why excessive heat? Could be a lot of factors. Higher wall voltage (125v vs 110-115 specked) The transformer may have been run close to its maximum capabilities which causes excessive heat damage over time. Capacitor failure/higher current draw. Tube failure, etc.
Follow Ups:
After re-reading your post, I do remember that I also needed to stuff one of the big cans with fresh caps. I don't remember if anything was shorted.
This photo is from 'the usual' or 'common' X-101-B in an epay listing.
Tom
Dark energy? Ridiculous!
We live in an electric universe.
I suspect there was a manufacturing defect in the transformer itself. It was like that when I got it second hand. If/when I find the sales receipt, I'll ask the manufacturer, assuming they're still in business, how many of those trannies they built.
BTW, It was about 40 years ago I took the defective part to the TV repair shop, and the old timers there were very helpful. They told me what voltages I needed, and that it was 'standard stuff' and I should be able to find something that would work. I got the X-101-B going with a bigger transformer from a Zenith color TV that had everything I needed and then some, but no center tap on the high voltage secondary. A bridge rectifier and safety ground wire took care of that. The mod required no 'hacking'- the transformer fit perfectly with only two fasteners kitty cornered, and the bridge was fitted with the right size pins to plug into the tube socket. The worst of it all was when turning it on, the tubes got hit with high voltage before the heaters warmed up.
I listened to it for a few weeks and found it very nice and sweet. I will be putting it back to its original configuration.
I started this thread to see if I may have something rare and possibly $ valuable.
Dark energy? Ridiculous!
We live in an electric universe.
I had an old HH Scott 299B where one of the large ceramic resistors failed and took the whole unit down-
Happy Listening
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