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RE: atkinsonrr PLEASE READ

69.112.49.146

In Reply to: RE: atkinsonrr PLEASE READ posted by atkinsonrr on April 21, 2018 at 09:28:00

Two things.
One is the dac tube stage was running at a different parameter due to DC in the feedback most likely altering the operating voltages. Voltages could be different than the readings you took with the cap out of circuit.
Second thing is a lot of tubes show full B+ voltages until they start conducting so there's a possibility that the 40 or so volts is where the tube settled.Could start out much higher than that.Most designers use caps that are rated for the full b+ for that very reason.

Edits: 04/21/18

Follow Ups:

RE: atkinsonrr PLEASE READ - atkinsonrr 12:39:26 04/24/18 (0)
Thanks for the additonal info Brick. Regarding voltages before the tubes settle in after turn on, I guess I lucked out again. My DAC has a 'warm up' mode during which the outputs are muted. Only once the tubes stabilize are the outputs connected to circuit.
RE: atkinsonrr PLEASE READ - Tweaker456 16:10:08 04/21/18 (0)
Ok, thanks for the answer.
"The needs of the many outweigh the needs of the few or the one"
Vulcan Proverb

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