FYI, Bob had recommended not using the (2) 7.5 volt Zener diodes in the biasing network as his opinion of them is that they were of inferior quality. If you overheat them or in my case if they fail on thier own you will indeed experience the plates glowing red hot in the output tubes (6BQ5). He later suggested to me that he recommended a 17 volt 2 watt zener to replace them. I have not yet sourced a replacement diode. Harry
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