main power transformer for Fisher

SharpyWarpy · 28th June 2007, 12:25 AM

Anybody know where to find a main power transformer for a Fisher "Studio Standard" model CA885? The part number is 4-2512-23700, a google search without the dashes turned up one result but, alas, it is no longer available and the site recommends a substitute part which it doesn't provide. I can't find any information about the transformer, either, and neither the shop manual nor the schematic give the output voltage. If I only knew what the output voltage is I could probably find something to replace it with. See the attached pics. Thanks.

XEAGLEKEEPER · 28th June 2007, 11:19 PM

I take it ,it is 117vac primary , what secondary voltages do you need. And what is the pin spacing measurements.

AndrewT · 2nd July 2007, 08:51 AM

Hi,
main power transformer? it looks tiny, is this a pre-amp?
where in the circuit is it fitted?

SharpyWarpy · 2nd July 2007, 12:10 PM

It's called a main power transformer in the schematic, it provides power to the function control, the remote and the main power relay circuits. There's a much bigger transformer -- the sub power one -- for the main amplifier circuit.
This little transformer turned out not to be the problem with this amp, a 5.6 volt zener diode used as a voltage regulator was the problem, apparently a victim of line voltage surge. Thanks for the replies.

XEAGLEKEEPER · 2nd July 2007, 10:53 PM

Zener is a hell of alot cheaper than transformer....Good for you..

28th June 2007, 12:25 AM	#1
SharpyWarpy diyAudio Member Join Date: Dec 2006	main power transformer for Fisher Anybody know where to find a main power transformer for a Fisher "Studio Standard" model CA885? The part number is 4-2512-23700, a google search without the dashes turned up one result but, alas, it is no longer available and the site recommends a substitute part which it doesn't provide. I can't find any information about the transformer, either, and neither the shop manual nor the schematic give the output voltage. If I only knew what the output voltage is I could probably find something to replace it with. See the attached pics. Thanks.

28th June 2007, 11:19 PM	#2
XEAGLEKEEPER diyAudio Member Join Date: Jan 2006 Location: central Iowa	I take it ,it is 117vac primary , what secondary voltages do you need. And what is the pin spacing measurements. __________________ Murphy's Law : $10 transistor will always blow before the 10 cent fuse. Murphy was a optimus. __________________ Ret. USAF

2nd July 2007, 08:51 AM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, main power transformer? it looks tiny, is this a pre-amp? where in the circuit is it fitted? __________________ regards Andrew T.

2nd July 2007, 10:53 PM	#5
XEAGLEKEEPER diyAudio Member Join Date: Jan 2006 Location: central Iowa	Zener is a hell of alot cheaper than transformer....Good for you.. __________________ Murphy's Law : $10 transistor will always blow before the 10 cent fuse. Murphy was a optimus. __________________ Ret. USAF

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2nd July 2007, 12:10 PM	#4
SharpyWarpy diyAudio Member Join Date: Dec 2006	It's called a main power transformer in the schematic, it provides power to the function control, the remote and the main power relay circuits. There's a much bigger transformer -- the sub power one -- for the main amplifier circuit. This little transformer turned out not to be the problem with this amp, a 5.6 volt zener diode used as a voltage regulator was the problem, apparently a victim of line voltage surge. Thanks for the replies.

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