Fisher Amp with 500C Audio Transformers

sony6060

Super Member
Dying for new project. After all, Fisher has been good to me. Which Fisher amplifiers used the 500C large audio transformers?
 
Others may know better, but I'm thinking it may share transformers with the KX 200. At the very least, I know the transformers in the 200 were a version of the best 7591/7868 transformers Fisher made. I say "version" as some of them mounted through the chassis, or on top of it, or had the wires come out in different locations, etc. -- but all in all, the same basic transformer.

Good luck with your project!

Dave
 
800C used the same transformers as the 500C - except for some of the console versions. I would consult the Fisher Transformer Database, but I haven't gotten around to creating it yet...
 
The KX-200 reuses the original 7591 output transformers that were developed for the X-202-B.
It's the same size as the trannies in the 500-C, but the mounting hardware is different. The X-202-B and KX-200 had cutouts in the chassis that one endbell sunk into for miniaturization purposes. So, on those units, the boltholes were on the side at the end of the laminations. On the 500-C and probably 800C, though I've never paid attention, the boltholes are on the laminations side in the output transformers and the end bells are vertical.
 
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800C used the same transformers as the 500C - except for some of the console versions. I would consult the Fisher Transformer Database, but I haven't gotten around to creating it yet...

I have a pair from an 800-c executive, they are physically smaller than the 500c outputs.
 
Sony6060,
Are you thinking of another receiver, an integrated amp or an amp?

I do not know Fisher well. I want an amplifier to play with. Seeing I have a Fisher 400, I wanted to try an amp with the larger Fisher 500C style output transformers.
 
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There is a console pull on an aluminum chassis that's an amp only.
Here's a link:
http://www.audiokarma.org/forums/showthread.php?t=461654
The console guys may know more.

By the time 1960/61 came around the console business wasn't the focus in the same way and there aren't a lot of 7591 based console amps built to the standard of the SA-100 (7189) or SA-300 (6CA7/EL-34) that had cages n'stuff.

There are, however, a plethora of 7591 integrateds:
X-202-B
KX-200
X-101-B, X-101-C, X-101-D
Maybe a couple of others.

Have you considered salvaging trannies from a beater 500-C and building an amp out of it? I'd like to do that some day. An alternative is to find something like a X-101-D, which is kind of fugly and build something out of that.
There's a schematic for a 500-C trash find built into an amp by Marc Stager on the Fishergroup Yahoo site marked as 500-CA.
 
There is a console pull on an aluminum chassis that's an amp only.
Here's a link:
http://www.audiokarma.org/forums/showthread.php?t=461654
The console guys may know more.

By the time 1960/61 came around the console business wasn't the focus in the same way and there aren't a lot of 7591 based console amps built to the standard of the SA-100 (7189) or SA-300 (6CA7/EL-34) that had cages n'stuff.

There are, however, a plethora of 7591 integrateds:
X-202-B
KX-200
X-101-B, X-101-C, X-101-D
Maybe a couple of others.

Have you considered salvaging trannies from a beater 500-C and building an amp out of it? I'd like to do that some day. An alternative is to find something like a X-101-D, which is kind of fugly and build something out of that.
There's a schematic for a 500-C trash find built into an amp by Marc Stager on the Fishergroup Yahoo site marked as 500-CA.

The 660A console amp has physically smaller OPTs than the 500C / 800C, although it is a very nice sounding amplifier. If you want the true 500C sound w/out the tuner/preamp section, you are better off building the 500-CA amp using donor parts.

Here is the schematic for the 500-CA. Sorry for the large size:

8775970564_3fd9ff58c9_h.jpg


-D
 
I have a pair from an 800-c executive, they are physically smaller than the 500c outputs.

Those are from the 1963 Executive. Exclusive to that unit serials 10001-19999 only. The '64 executive used the regular 500-C/800-C transformers. Hold on to them!!!!
 
Those are from the 1963 Executive. Exclusive to that unit serials 10001-19999 only. The '64 executive used the regular 500-C/800-C transformers. Hold on to them!!!!

You know, Larry, I'm wondering if the Executive used the same OPTs as the 660-A amp. What's the P/N on them?

-D
 
T849-116-1 & 2 for the 660A outputs
T990-116 for the 950 executive.
T991-116-1 & 2 for the 960 Executive and all other 800-C/500C
 
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