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I've just completed a (P1 xtreme type) SE EL34 amp with FMV placed between 2nd (non-c/f) triode & master volume. It's super quiet & sounds great......just so long as I keep the treble on max! Roll the treble back & there's a loud buzz at the speaker. The pot itself, wiring connections, & continuity, appear good so what have I missed? Cheers.
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Have you got a scope, to check for ultrasonic oscillation?
If not, how about if you bypass 1 or other or both of the 12AX7 plates to ground with a large-ish cap, say 0.01uF?
I'm assuming that the buzz goes if the 12AX7 is removed?My band:- http://www.youtube.com/user/RedwingBand -
Tone Stack Trouble
Thanks for the advice. All sorted now. It didn't like my coax shield to ground connection at the MV pot on the EL34 grid wire. What a relief & what a sound? Electrically about as silent as you could get yet sonically thunderous. Time to build a cab!Comment
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