Hi Bill,
Clever idea trying the 0.01 uf cap in parallel with the 0.47 uf. That would presumably cause the filtering provided by the cap combo to become more effective at the RF frequencies corresponding to the switching that occurs in the output stage. As you no doubt realize, as a general rule of thumb a smaller cap such as 0.01 uf will tend to act more purely like a capacitor at RF frequencies than a larger one such as 0.47 uf.
And I see no reason to doubt that the improvements you perceived were real. Perhaps the reason is that the greater amount of RF garbage that was previously being put out by the amp had been finding its way to some other point in the system, or even some point earlier in the signal path within the same amp, resulting in effects at audible frequencies via intermodulation or AM demodulation or other such effects that can cause inaudible frequencies to have audible consequences. Although I suppose it's also conceivable that the RF had been directly affecting the speaker's sonics in some manner.
Best regards,
-- Al
Clever idea trying the 0.01 uf cap in parallel with the 0.47 uf. That would presumably cause the filtering provided by the cap combo to become more effective at the RF frequencies corresponding to the switching that occurs in the output stage. As you no doubt realize, as a general rule of thumb a smaller cap such as 0.01 uf will tend to act more purely like a capacitor at RF frequencies than a larger one such as 0.47 uf.
And I see no reason to doubt that the improvements you perceived were real. Perhaps the reason is that the greater amount of RF garbage that was previously being put out by the amp had been finding its way to some other point in the system, or even some point earlier in the signal path within the same amp, resulting in effects at audible frequencies via intermodulation or AM demodulation or other such effects that can cause inaudible frequencies to have audible consequences. Although I suppose it's also conceivable that the RF had been directly affecting the speaker's sonics in some manner.
Best regards,
-- Al