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In Reply to: RE: I have reread your post on this thread... posted by Tre' on June 21, 2016 at 08:52:33
Hi Tre, and thank you for checking my ideas. One of my concerns was that the input signal since halved for each 6sn7 section would be such a small signal to drive that the tube would be in a bad operating point. Although i have several preamps to drive the amplifier.
Going to an adjustable resistor for one of the cathodes to equalize the AC portion of the drive signal, how would one measure that signal? thank you for your help , regards, DAk
Follow Ups:
You should have enough gain if you have a preamp.
Like you said, your not needing a great deal of power. You're just going for good sound.
You would measure distortion. Adjust for minimum distortion.
Or, with a signal generator feeding the preamp, measure the AC voltage at each 6sn7 plate (between the plate and ground) and adjust until they are equal.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
hI, Tre, so i put a pot on one of the cathodes instead of the a bias resistor, then i can adjust the pot while measuring the AC on the plate and adjust the pot to get equal ACV? Sounds easy enough. cheers, Dak
Yes, wire the pot as a variable resistor. Start with it adjusted to 390 ohms and measure the AC at each plate. Adjust until the 2 plates AC voltages are equal.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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