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6SN7 beta follower : effect of cathode bypass cap lower triode section ...

I added a 100uf cap across the lower triode section cathode resistor of 6SN7 beta follower to DC 2A3 finals.

Ran FFT spectrum w/1K sine wave input at 1W output.

There was no significant change in harmonic profile or THD%/THD+N% on the output of the amp with 8 ohm/50W resistor loading.

Ran 20-20KHz bandwidth sweep with FFT and nothing significant changed there either.

I guess a cathode bypass cap on the lower triode in not needed in this circuit.

The Morgan Jones book p.126 shows cheap red led's instead of a cathode resistor.

I'll try the LED's and see if anything changes.



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Topic - 6SN7 beta follower : effect of cathode bypass cap lower triode section ... - deathtube 667 09:41:42 04/06/14 (4)

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