I want to build a guitar amp that will primarily use 4 x 6V6, but could handle 2 x 6L6. I'm thinking around 290V on the plates. Cathode-biased with P-P pairs having their own cathode resistors and bypass caps.
I'm trying to figure out the best output xformer to use, but I'm not sure.
From tube data sheets class A PushPull plate-plate impedance (pair):
- 6V6 8K, so 4 would be 4K?
- 6L6 5K
Should I go with a Hammond 1650N as the primary impedance is 4K4, even though it's power handling will be overkill?
In another post, dhuebert recommends using the 1650H for a modified BFA 4 x 6V6), but that's fixed bias. Would it work reasonably well under cathode-bias, 290V B+?
(BTW, I need a guitar amp more than a BFA right now, so the iron for that project will be sitting on the shelf for quite a while...let me know if anyone's interested in them, actually...they're brand new 278CX, 1650T, 159M)
Thanks,
Chris