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.
This post is made possible by the generous support of people like you and our sponsors:
Topic - 6SN7 beta follower : effect of cathode bypass cap lower triode section ... - deathtube 667 09:41:42 04/06/14 (4)
- RE: 6SN7 beta follower : effect of cathode bypass cap lower triode section ... - Tre' 10:51:56 04/06/14 (3)
- RE: 6SN7 beta follower : effect of cathode bypass cap lower triode section ... - deathtube 667 11:36:14 04/06/14 (2)
- RE: 6SN7 beta follower : effect of cathode bypass cap lower triode section ... - Tre' 11:45:18 04/06/14 (1)
- RE: 6SN7 beta follower : effect of cathode bypass cap lower triode section ... - deathtube 667 12:10:40 04/06/14 (0)