clydeselsor
Lunatic Member
A friend gave to me a set of transformers from a Fisher 500C receiver. One pwr and two opt's. Does anyone have the specs and color codes for these?
Fisher 500C transformer questions
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clydeselsor
Lunatic Member
Thought I would try again.
merrylander
AK Member
Google it, AFAIK there is a copy of the schematic out there somewhere.
Ciscokid
Member
Here's a schematic, however, no wire colors:
Fisher 500C
I have a 500c in storage, if you continue having hard time finding what you need I can break out and shoot some close up pictures and post. Might be awhile though..
ck
Fisher 500C
I have a 500c in storage, if you continue having hard time finding what you need I can break out and shoot some close up pictures and post. Might be awhile though..
ck
pocketchange
AK Member
Slip over to FleeBay, there is an original service manual available..
merrylander
AK Member
Save your money, the manual does not show colors nor even the voltage values.
The power transformer is a voltage doubler, with about 170VAC output. Assuming that it has to supply a DC current of about 150 mA, it would have an AC current rating of about 500 mA. The heater winding(s) can supply about 8A total. the output transformers are about 6K center-tapped to 4 / 8 / 16 Ohms. An ohmmeter can ID the windings - colors are usually per the RMA standard: http://www.nostalgiaair.org/References/rmacodes/pwrxfrmr.htm
http://www.nostalgiaair.org/References/rmacodes/audxfrmr.htm
The speaker taps will be a bit more difficult ('cuz' I'm not flipping MY Fisher over just now...) but you can measure it as described in the article: http://www.radioremembered.org/outimp.htm
http://www.nostalgiaair.org/References/rmacodes/audxfrmr.htm
The speaker taps will be a bit more difficult ('cuz' I'm not flipping MY Fisher over just now...) but you can measure it as described in the article: http://www.radioremembered.org/outimp.htm
clydeselsor
Lunatic Member
Thanks guys! This really helps a great deal. I was wanting to build an amp with these.
Dadbar
Super Member
If you have a voltmeter and a low voltage AC source you can pretty much figure it out. It's been a while since I've seen one...used a set off Ebay a few years ago for a project for a friend...
IIRC correctly for the power tranny:
black leads are 120v power.
red and red/yellow- Secondary power
blue and brown- to full wave bias rectifier
remaining leads are 6v filament power. There is one really short fat gray lead - filament power for the outputs (use your VTVM to find its mate). The other leads (green or yellow IIRC) fed 6v power to the FM section tubes.
The outputs.....from memory...
red-power in
blue and blue/yellow- to plates
black- ground
brown- 4 ohm
green 8 ohm
yellow 16 ohm
Good luck- MAK
IIRC correctly for the power tranny:
black leads are 120v power.
red and red/yellow- Secondary power
blue and brown- to full wave bias rectifier
remaining leads are 6v filament power. There is one really short fat gray lead - filament power for the outputs (use your VTVM to find its mate). The other leads (green or yellow IIRC) fed 6v power to the FM section tubes.
The outputs.....from memory...
red-power in
blue and blue/yellow- to plates
black- ground
brown- 4 ohm
green 8 ohm
yellow 16 ohm
Good luck- MAK
