F6 Amplifier

I think maybe Papa has hit a roadblock on his design and is looking for ideas from us. :D
If so, then Zen Mod's suggestion of using Enhancement and Depletion N-Jfets [with in-phase driveto their gates] is a possibility. Granted the two devices are exact opposites in characteristics; such that a high symmetry in operation is obtained. Loop feedback will correct for residual asymetry.
 
I realize that this is an incomplete circuit (no input buffer, and no bias circuits), but it demonstrates the drive of the output FETs from the transformer. I have no idea what inductances should be used for the transformer. In this simulation I used a 1:1 winding ratio.

watts Thd
1 0.039940%
5 0.023063%
10 0.017839%
15 0.018988%
25 0.032031%
 

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  • F6-v2.jpg
    F6-v2.jpg
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I realize that this is an incomplete circuit (no input buffer, and no bias circuits), but it demonstrates the drive of the output FETs from the transformer. I have no idea what inductances should be used for the transformer. In this simulation I used a 1:1 winding ratio.

watts Thd
1 0.039940%
5 0.023063%
10 0.017839%
15 0.018988%
25 0.032031%

Please reverse the phase of the transformers above to be like that in thread #1. We look forward to your comparative results.