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In Reply to: RE: CCS for 6SN7 driver tube posted by Michael Samra on June 24, 2016 at 14:07:51
A lot of arguments could be made against what he is proposing.(2 SE amps driven out of phase by means of a input transformer and coupled at the output tubes with a push pull transformer)
But it's what he wants to try.........
BTW the circuit, as drawn, has feedback. Rfb1 and Rfb2 on the schematic.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 06/24/16Follow Ups:
A typical PP amp might have a voltage amp coupled to inverter/splitter coupled to output tubes. One could have the inverter/splitter first if desired (transformer or something else).
I guess I am having a hard time seeing how the finished product can be called "two SE amps" driving a push-pull transformer. Once the SE output transformers are removed (and you have no air gap and core with DC current) you no longer have anything that is "SE" or different from many standard push-pull amps (other than the input transformer doing the splitting).
"I guess I am having a hard time seeing how the finished product can be called "two SE amps" driving a push-pull transformer."
Yes, there's a conceptual error in all this. It makes no sense to me either. Seems somewhat akin to building a bicycle by connecting two unicycles together.
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Buy Chinese. Bury freedom.
"Seems somewhat akin to building a bicycle by connecting two unicycles together."
That's a good analogy of what he wants to do.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
That's where so much of confusion comes in..He will need two separate 6sn7s for each channel and he is splitting the phase via transformer in the beginning with NO voltage amplification before or after the PS trafo.
I think the best way for him to do this is to CCS plate load a 6SN7 for each tube. He already split the phase with the trafo and now just use the first half of each 6SN7 as a voltage amp and the second half as a DC coupled follower to drive each of the output tubes..He will have a voltage gain of 20 but if he only wants to drive the KT88s to 12 watts,he will probably have enough gain but can't be 100% sure.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
"But won't he need four SE amps?"
Yes.
"I guess I am having a hard time seeing how the finished product can be called "two SE amps" driving a push-pull transformer."
I understand what you mean.
It's just that what he wants to do is not a "normal" push pull amp.
A normal push pull amp would have a diff amp for the output stage and the driver stage. He doesn't want to do that. He wants two SE amps coupled at the input with a input transformer and at the output with a push pull output transformer.
And yes, in the end it's a push pull amp but a very different way of getting there.
Why he wants to do it that way, I have no idea.
I think the results might be interesting.
That's all, nothing more, nothing less.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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