Originally posted by Enzo
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35+50+12 adds up to 97V, close enough, and a not too large wirewound resistor drops the remaining 13V (these things come from the "nominal 110V" era)
Something I saw now and then was to put a 12V pilot lamp in series to drop those extra volts but bypassed by a resistor, because lamp did not use 150mA (like filaments did) , rather some 40 to 60 mA.
No big deal.
EDIT: classic tube complement in simple amplifiers was: 35W4 , 50C5 (might also be 50L6) , 12AV6
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