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Old 14th June 2007, 09:00 PM   #1
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Default Mystery transformer

I've got a small PP output transformer. I'm pretty sure I've identified the primary side. The leads are colored blue, red and brown. DC resistance from blue to brown is 416 ohms. Red is dead smack in the middle.

It seems there may be two (?) secondary windings. One seems to be have green and black leads. It's about an 11:1 turn ratio. The other has a yellow lead and a bare lead. It's about a 48:1 ratio.

I think the yellow/bare might be good for a 9.2k ohm plate load into a 4 ohm speaker. I don't know what the black/green is supposed to do.

The top of the frame is stamped 95-1625, 343832. It allegedly came off a Zenith console amp which used a pair of 6BQ5 for output tubes.

Any ideas what to do with this thing?
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Old 14th June 2007, 10:33 PM   #2
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Zenith used a number of transformers like this (and numbered their transformers 95-xxx). The extra winding was used for feedback. I have a couple, and may try the attached circuit... 6V6 amp
(untested - subject to change!)
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Old 15th June 2007, 12:24 AM   #3
Colt45 is offline Colt45  Serbia
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my bet is on feedback as well.
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