RE: Fisher KX200 runs too hot

Vintage Asylum

Classic gear from yesteryear; vintage audio standing the test of time.

In Reply to: Fisher KX200 runs too hot posted by MIrving on February 21, 2009 at 05:28:46:

Are you able to bias it normally? You might try a lower idle current. I would drop the 7591 grid resistor value from 270K to 150K and up the output coupling caps from .047 to 0.1 uF. But this won't help unless you have a tube with grid leakage (rumor has it that modern ones have a bit more leakage than the old ones did).

I have a scan of the service manual if you need it... tbavis(at)rochester(dot)rr(dot)com

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Topic - Fisher KX200 runs too hot - MIrving 05:28:46 02/21/09 (4)

Raise the bias voltage - sgmlaw 08:02:59 02/22/09 (0)

RE: Fisher KX200 runs too hot - Tom Bavis 13:10:35 02/21/09 (0)

RE: Fisher KX200 runs too hot - Jon C. 06:23:45 02/21/09 (0)

If all your voltages are within spec. when checked with your meter - 1973shovel 05:44:05 02/21/09 (0)

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RE: Fisher KX200 runs too hot - Tom Bavis 13:10:35 02/21/09 (0)

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