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    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

6SN7 SRPP

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#21
artosalo said:
I simulated the SRPP again, but with 125A, because I don't know the primary inductance of 125ASE.
With 20k load the gain drops to -6 dB, which means that a pre-amp is required.
The frequency response is still poor, at 20 Hz the drop is 3 dB.

I also run the simulation of the 6SL7_6SN7 with 20k and full primary (15H).
THD is lower, but clipping begins now at 33 mW.
I suggest to use the full primary and select the proper secondary tap by listening test.
This circuit is superior compared to SRPP.
Click to expand...


Ok thanks for all your help. The Hammond 125A is cheaper and will yield better results. I am going to ditch the SRPP topology.
 
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