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Stromberg ASR-880 Biasing
Stromberg ASR-880 Biasing
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Old 18th January 2017, 02:09 AM   #21
Lawrk is offline Lawrk
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Re-reading the entire thread, I like your earlier idea about putting the power resistor in the power supply primary. That sounds like a much better idea than what I said about putting it in the secondary.

As a test I can reduce the line voltage to 117 Volts with a Variac and see what I measure on the DC side.

Last edited by Lawrk; 18th January 2017 at 02:11 AM.
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Old 18th January 2017, 02:46 AM   #22
PRR is online now PRR  United States
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> R91 and its Br,R,Gr 1.2M Ohm.

Ah, me wrong, too much squinting. There is a Balance pot and two 150K hung on that. So the string is more like 10K, 5K, 70K, and some others. Given 60V in, about 45V at the grids.

My point remains. If you want the tubes to idle hotter, reduce the to-ground resistor. Try a 1Meg or 500K across the 1.2meg. Get to "a little too hot", then you can trim-back with the trimmer.
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