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Why does the Schematic not have coupling caps in either of the pre channels before the 470k mixing resistors? (I've never looked inside a 6G6B to tell whether the schematic has a mistake or not. But there ain't any on the Layout pic either). Would it work better or worse without the coupling caps there? Any opinions?
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Building a better world (one tube amp at a time)
"I have never had to invoke a formula to fight oscillation in a guitar amp."- Enzo -
I don't think coupling caps would make any difference in that part of the circuit. Ordinarily you would see some there But ordinarily there is a load prior to the PI coupling. Fender probably just left them out as a matter of Muntz."Take two placebos, works twice as well." Enzo
"Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas
"If you're not interested in opinions and the experience of others, why even start a thread?
You can't just expect consent." Helmholtz -
Yes I had wondered as much.Originally posted by Chuck H View PostBuilding a better world (one tube amp at a time)
"I have never had to invoke a formula to fight oscillation in a guitar amp."- EnzoComment
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The 6g6a has them AND the little cap entering the PI. The 6g6b only has the little one at the PI. I tried the circuit with and without the coupling caps at the preamp and preferred the 6g6b arrangement. At first I thought it was Fender just being cheap, but it does sound noticeably better to me, so that's why my 6g6 circuit turned out to be the (b) version.Comment
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There's nothing like actually trying it to KNOW instead of wonder. The acid test for all this stuff is our ears after all. WRT guitar amps we don't look at things like harmonic distortions or bias imbalances the same as the engineers do. It's a bit alchemetic (I just invented that word!!!).
EDIT: Ah rats! I just looked it up and the proper word does exist. It's "alchemic". Trying to know...Last edited by Chuck H; 08-12-2013, 02:33 PM."Take two placebos, works twice as well." Enzo
"Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas
"If you're not interested in opinions and the experience of others, why even start a thread?
You can't just expect consent." HelmholtzComment
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Well, I believe alchemeticy is way radder!! haha!!Comment
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From one alchemeticist to another, I salute you! Rock on!Originally posted by deci belle View Post
If it still won't get loud enough, it's probably broken. - Steve Conner
If the thing works, stop fixing it. - Enzo
We need more chaos in music, in art... I'm here to make it. - Justin Thomas
MANY things in human experience can be easily differentiated, yet *impossible* to express as a measurement. - Juan Fahey
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Compare the B to the A. In either case, there are just enough caps to block any DC. In the one there are no caps from the preamp plates, the mixing resistors join and feed through a cap into the PI. In the other, there are caps from each preamp plate, then the mixing resistors join to enter the PI without a raincoat. SO the basic decision is, which side of your mixing resistors do you want your caps on.Education is what you're left with after you have forgotten what you have learned.Comment
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