Mystery transformer

Ty_Bower · 14th June 2007, 09:00 PM

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?

Tom Bavis · 14th June 2007, 10:33 PM

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!)

Colt45 · 15th June 2007, 12:24 AM

my bet is on feedback as well.

14th June 2007, 09:00 PM	#1
Ty_Bower diyAudio Member Join Date: Mar 2007 Location: Newark, DE	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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14th June 2007, 10:33 PM	#2
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	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!)

15th June 2007, 12:24 AM	#3
Colt45 diyAudio Member Join Date: Feb 2002 Location: Canada	my bet is on feedback as well.

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