RE: Excessive bias voltage drift

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In Reply to: Excessive bias voltage drift posted by dandaroy on April 19, 2021 at 18:01:03:

The highest grid resistors you can use with fixed bias is 220K on NOS 20 plate dissipation tubes or 180K on newly made tubes. I would use 120K on KT-88, EL34 and 6550 tubes newly made tubes.

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Follow Ups Full Thread

Topic - Excessive bias voltage drift - dandaroy 18:01:03 04/19/21 (6)

RE: Excessive bias voltage drift - sony6060 04/30/2108:33:03 04/30/21 (0)

RE: Excessive bias voltage drift - tubular.well 08:30:07 04/21/21 (0)

Seller has agreed to exchange the two tubes (nt) - dandaroy 19:45:37 04/20/21 (0)

RE: Excessive bias voltage drift - Cut-Throat 07:10:12 04/20/21 (1)

RE: Excessive bias voltage drift - sony6060 07:56:32 04/20/21 (0)

RE: Excessive bias voltage drift - Triode_Kingdom 21:50:25 04/19/21 (0)

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RE: Excessive bias voltage drift - sony6060 04/30/2108:33:03 04/30/21 (0)

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