In Reply to: RE: Circuit rev 2.2 posted by Paul Joppa on December 14, 2014 at 11:00:57:
"First change would inject any hum at the cathode of the driver, instead of at the plate and attenuated by the plate choke impedance - so I would expect a lot more hum. It's a fairly easy experiment though ..."
Ultrapath requires a very quiet PS.
"The second change is unclear; you appear to describe moving the 2A3 bypass cap to parallel the existing ultrapath cap?"
The ultrapath cap goes from the output of the PS to the cathode of the 2a3, not ground.
What I am proposing is to remove the 2a3 cathode bypass cap (it's not needed, the ultrapath cap bypasses the cathode resistor) and use it as a cap from B+ to ground in order to reduce the ripple of the PS.
Tre'
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Follow Ups
- RE: Circuit rev 2.2 - Tre' 16:06:32 12/14/14 (3)
- RE: Circuit rev 2.2 - Paul Joppa 18:17:18 12/14/14 (2)
- RE: Circuit rev 2.2 - Tre' 19:14:22 12/14/14 (1)
- RE: Circuit rev 2.2 - Paul Joppa 13:21:51 12/15/14 (0)