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RE: Fisher 80AZ zmatic

Posted by Michael Samra (D) on April 20, 2011 at 11:06:02

In Reply to: Fisher 80AZ zmatic posted by stltrains on April 19, 2011 at 18:06:20:

Mike
That circuit basically works as a gesture to alter feedback for dampening for different speakers.You will notice when the control is fully counter clockwise,you will notice no change in sound when you move the slide switch.I have this circuit on my 100s and my 80az's and I can tell you that they don't bother anything in the circuit.I will check my units but when the switch is fully counter clockwise past the click,it opens the connection just like a normal switch.
You can really make these amps sound incredibly good just with putting a 35uf film cap off the 5v4 and then putting a couple dual 100s for the other filter caps..I then disconnect the volume pot and put a 470k to ground on the grid of the 12at7.Then,you want to rewire the filaments of the 12au7 for a 6cg7 and then of course,put some k40s on the EL37s and the phase splitter and then change the other caps to your cap of choice and enjoy.

"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

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