re: dc filaments
-
In some boutique ultra high stage gain audio amplifiers
made for guitar players, dc is pretty much a requirement.
Else the circuit would just plain not work. I have built polarity
reversal circuits for friends.
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Debates and discussions on guitar audio amplifier
news groups bring up interesting personal choices.
-
Over voltage filaments and heaters along with dc operation
are reported to slightly reduce the expected 10,000 hour
(claimed by one tube dealer in the group). These "hot
running" amplifiers are judged on their actual output
"tone." Many professional players are willing to change
their tubes once every year or two for that extra _____.
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DC filament / heater operation has a hard core group
of people who swear by it.
-
cheers
skipp
http://sonic.ucdavis.edu
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