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In Reply to: RE: Hot 6SN7 Preamp update posted by Triode_Kingdom on August 02, 2017 at 12:42:14
Is there an advantage to raising the voltage on the heater line, if it's already rectified to DC?
There's some rumbling about improved performance with 50-90V of bias on the heaters of indirectly heated tubes. In a tube preamp like that one, one would presume that at least one cathode is quite elevated WRTG, so biasing up the heater supply isn't an impractical precaution to take.
There's probably a cathode follower or pseudo-SRPP where the cathode-heater voltage limit might otherwise be exceeded.
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