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In Reply to: RE: It's unusual that 12AU7s in preamps are run as paralleled filaments. posted by firstname.lastname@example.org on March 20, 2014 at 06:36:57
The schematic posted doesn't show how the heater supply is wired.I saw a post on the web forum advising checking heater voltage between pins 4,9.
The filaments are in parallel just by the fact you are checking between pins 4 and 9.. You are ok with 6.7vdc and it wouldn't hurt to drop it s tad.
Honest amplification is better than excessive 2nd order distortion anytime.
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