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RE: 71A schematic...

Vinnie,

Just a couple of changes I would make to this. The Rp of paralleled 6SL7's would be about 25K. Therefore you may want to up the plate resistor and drop the dropping resistor to like 75K and 25K.

Also the 470k input is not a good idea when you parallel you need to derate the 1M max imput impedance accordingly. I would drop it too say 250K and then grid stop each section with like a 1K or something.

I am not a fan of paralleling tubes. You maybe better off using some of the obscure single triodes.

I love the 71A using it all over the place have like 300 of them now.

Thanks
Gordon
J. Gordon Rankin

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