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In Reply to: RE: Fisher Amplifier Voltages Questions posted by dls123 on September 19, 2013 at 07:11:30
One of the coupling caps and the cathode bypass where bad. Replaced the coupling caps with Russian PIO's, replaced the pf caps with silver mica's, matched inverter resistors added and dropped in a 200ohm cathode resistor in place of the 120ohm.
Voltages are close to spec and it sounds very smooth with a tighter and fuller bottom end than my 30-A. Power transformer runs cooler too. P/S filter caps are next.
Thanks for all the the tips!
Follow Ups:
Good to hear that all is well. Yes, go through and completely rebuild the power supply. Diodes if there are any too. Try and get all the old sand resistors out of there and replace with good modern 1% or 5% non-inductive ones like Mills or Dales. They are really not very expensive. You will find that the bass will tighten up with the stiffer power supply. Have fun!
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