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RE: 6BQ5 Plate Voltage questions on Heathkit conversion to guitar head

The tube's screen grids get a real beating in a guitar amp - add some 470 Ohm droppping resistors in each screen lead (from screen to transformer if it's still in UL). You'll find these in most guitar amps - screen current jumps much higher when the tube approaches clipping, which you DON'T do (or only do on occasional transients) in a hi-fi amp.


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