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In Reply to: RE: CCS for 6SN7 driver tube posted by DAK on June 20, 2016 at 17:17:42
It's too bad they don't have an octal version of a 7247 which is half of a 12AX7 and half of a 12AU7..You need to swing at least 100v of signal to drive the KT88s to full power.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Follow Ups:
...is half of a 6SL7 plus half of a 6SN7, in one envelope. MFA Luminescence is the only commercial product that ever used them, so far as I know.
6EM7 is more like half 6SL7 and half 6BX7 with lower mu.
6DN7 is more like half 6SN7 and half 6BL7.
The high mu side of the 6EM7 is very like a 6SL7 half. The low mu side is quite different from a 6SN7 section. Its gm is `3x the 6SN7, mu about a quarter, and it is quite capable of use as the power final element.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
Yes
I forgot about that.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
According to AK simulations the amp puts out 12 watts per channel. Which is decent. Really that is plenty for my speakers and the size of my room.
Now keep in mind that the HF=87 output transformers are in the 5k range where the typical KT88 runs at 3.3k to 3.6k. That will explain part of the lower power rating of the circuit especially if you running below 430v B+.
If that's all you are looking to get out of the amp which is 12 watts,your implementation would be fine.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
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