10-16-2014, 12:11 PM
I would probably leave out the .003 uF caps, as you mentioned Ron. They would be an unnecessary risk for failure given the high voltage across them.
The only reason I can think of for using them would be to reduce the RF harmonics produced as each diode suddenly stops conduction on the AC waveform. You sometimes see these caps with silicon diode rectifiers in solid state receivers. I could see the need for them if this radio covered the LF 200-400 Khz band, where the RF noise generated would be the greatest. Perhaps a similar model had a LF band and they carried over the power supply design?
The only reason I can think of for using them would be to reduce the RF harmonics produced as each diode suddenly stops conduction on the AC waveform. You sometimes see these caps with silicon diode rectifiers in solid state receivers. I could see the need for them if this radio covered the LF 200-400 Khz band, where the RF noise generated would be the greatest. Perhaps a similar model had a LF band and they carried over the power supply design?
