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In Reply to: RE: CCS for 6SN7 driver tube posted by DAK on June 20, 2016 at 12:38:58
It sounds as tho you are going to use one 6SN7 per output tube as a driver/voltage amp for each KT88 and you are going to split the phase with the Lundahl.Using both sides of each 6SN7 with say a 10M45 will definitely give you more voltage gain,but I'm not sure it will give you a enough.Keep in mind that you will have some losses thru the PS transformer because there is no gain before you split the phase and then you are asking a pair of low mu triodes to handle these duties.Now I see you mentioned in the post below that you are using 100K plate loads and that is set up for high gain..Were you planning on paralleling the triodes in each 6SN7,or using one triode for voltage gain and the other as a driver? I think you could do it the latter way.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Edits: 06/20/16Follow Ups:
I was planning to use 1 half of each 6sn7 to drive each power tube. I realize that the 6sn7 has low gain and i could reconfigure the amp with a 6sl7 for more gain.
I have made this SE amp and really like the sound so i had the "clever" idea of making a PP version using the input transformer splitter.
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
...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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