06-07-2020, 08:07 PM
Murphyv310 Wrote:Hi.
An update on some further tests.
Adding in a diode between D1 anode and ground virtually damps the audio to nothing as does a good low capacitance 2.5Mh choke. Seems the only way this performs is a Diode with no DC path or with very high resistance values where there is a marginal performance gain, distortion is also less. I also found two AA143 diodes that work well except for more distortion. I'll now wait till I have the 1N60P diodes I ordered.
That's really surprising! Just checking, the 'new' diode is the right way round?
All I can think, is with things now 'right' that the 2nd valve is cutting off with the DC form the detector being too much. How about a 10M grid leak, with the AF coupled to it by 0.01uF capacitor, with the detector loaded by 1M (ie across your 100pF)?
