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In Reply to: RE: Testing a Fisher 300 Amp posted by Zardiw on February 16, 2015 at 16:18:33
Zard
That's a power amp and you really need a preamp to be able to control the volume..Lets assume that you have one and even a solid state preamp will work fine or even a CD player with a volume control..Just bring up the amp slowly on the variac starting at about 20vac..Gradually increase the voltage by 5v to 10v increments.Listen for any significant vibration on the variac as you increase the voltage..If you get it,stop.You may want to wait five or ten minutes between voltage increases but it's not necessary if you plan on recapping the unit.If you want to reform the filter caps,then do the slow thing.Be sure to hook up some cheap speakers while doing this.
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
Follow Ups:
It also maybe the ss integrated amp, he does not say whether it is the SA300 or TX300. Fisher can drive you nutty with their model numbering especially, the receivers.
Don Brian Levy, J.D.
Toronto ON Canada
That's true Brian.The only vintage amps and preamps even are very confusing in their model number assigning.
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
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