11-15-2010, 08:43 AM
I see one problem. It is necessary to have G3/5 connected on the 6A7 since these are the "screen grid" of the tube and I doubt it would function correctly with no screen voltage?
Ditto G2/4 on the 6SB7Y.
Since G2 is tied to G4 on the 6SB7Y, I don't see how you could wire this tube to function as a 6A7 or 6A8.
I can think of one single-ended tube that has its grids arranged like a 6A7 or 6A8...the 7J7. And it actually has a separate triode section for the oscillator, unlike the 6A7/6A8 where the five grids perform both mixer and oscillator functions.
Ditto G2/4 on the 6SB7Y.
Since G2 is tied to G4 on the 6SB7Y, I don't see how you could wire this tube to function as a 6A7 or 6A8.
I can think of one single-ended tube that has its grids arranged like a 6A7 or 6A8...the 7J7. And it actually has a separate triode section for the oscillator, unlike the 6A7/6A8 where the five grids perform both mixer and oscillator functions.
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Ron Ramirez
Ferdinand IN
