Tubes Asylum

RE: Runaway 7581A

74.69.101.65

In Reply to: RE: Runaway 7581A posted by Thermionic27609 on July 02, 2009 at 20:12:22

>> What I also wonder about is why Fender did things like use a 220k grid resistor with fixed bias--over twice the maximum on the tube's datasheet. Isn't that asking for grid emission and bias creep problems? >>

Almost all fixed-bias guitar amps use over-spec grid resistors... makes the output stage easier to drive. You can get away with it if you bias them on the cold side.

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