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Old 23rd March 2012, 09:57 AM   #1
ryuji is offline ryuji  United States
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Default given choice of low screen voltage or low bias which sounds better or is it equal

i would like to know some opinions given the choice of low(ering) g2 voltage, or supplying a more negative g1 bias, which one is better for sound, or are they pretty much equivalent solutions

guess in less words, adjust gain or adjust driving voltage? from the over simplified statement im thinking that answer might be the gain as it would drop down the noise floor. Guess im a bit partial to this solution, as it has an additional benefit of potentially permitting me to reduce component count as my driver and output screens could be directly driven by the same supply?
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Old 23rd March 2012, 01:26 PM   #2
TheGimp is online now TheGimp  United States
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What tube?

Lowering the Screen voltage will compress the gain and depending on the tube may increase distortion.
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Old 23rd March 2012, 01:32 PM   #3
ryuji is offline ryuji  United States
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gu-50, was thinking of 100~150v

heres all my collected data on them
Index of /data/Datasheets/gu-50

the other affected tube is 6cb6's, but there designed for less then 150v anyways

oh and i only need about 40 mA bias from them

my friend tried the pair i mailed him with very low g1 dc voltage (iirc, about -60v) and said they sounded better then what i am presently using for tubes, so im trying them out =)

oh and if it isnt already evident, this is SE operation

Last edited by ryuji; 23rd March 2012 at 01:39 PM.
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