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RE: grid resistors first stage of amp

I like 100K to 150K. Going up to 0.5M risks grid current biasing.
At 100K versus 500K, the difference in overall db signal loss is pretty darn small, bordering on unmeasurable. The reason for higher value grid leak resistors is to be able to use lower value coupling caps as well as less high frequency degradation with long and higher capacitance interconnect runs. If you don't have those issues, the 100K is peachy.

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