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1. [Amps] 3-400Z Tube problem (score: 1): Author: ko4nrbs@yahoo.com (Bill Smith); Date: Tue, 18 Jun 2002 07:27:19 -0700 (PDT); I have a 3-400Z tube that has 100ma of plate current when it is supposed to be cut off. I verified this by installing a spare tube. There is a 47K ohm resistor in this Swan Mark 1 that cuts off the t; /archives//html/Amps/2002-06/msg00138.html (6,732 bytes)
2. [Amps] 3-400Z Tube problem (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 18 Jun 2002 10:51:22 -0700; Measure the grid-fil V when the amp is in standby and the fil is lit. If the result is 0v, you probably have a tube that shorts when the fil is hot/expanded. [See *QST*, September, 1990] I have been; /archives//html/Amps/2002-06/msg00142.html (6,868 bytes)

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