I sent the information off to Kara and she is going to run some calculations and contact me when she gets home from an audio show.
I do have one more query. Is it possible that the preamp is passing on this signal from a source? My Modwright-Logitech transporter is tube rectified. I have experienced woofer modulation in one speaker with certain tubes. The modulation moves to the other speaker when the tubes are swapped right for left. I just assumed I had a failing tube but these are tubes I was using when all of this started. As I have stated the amplifier modulation has never occurred since the 47k resistor was installed but I can still get the woofer modulation when specific tubes are placed in the transporter. Is it possible that this modulation was being amplified by the preamp and sending the amps in to motorboating? If this is the case does it still point to the preamp being the problem because the circuitry is designed to have such a minimal impact on the signal that it lacks the sophistication to correct this?
I do have one more query. Is it possible that the preamp is passing on this signal from a source? My Modwright-Logitech transporter is tube rectified. I have experienced woofer modulation in one speaker with certain tubes. The modulation moves to the other speaker when the tubes are swapped right for left. I just assumed I had a failing tube but these are tubes I was using when all of this started. As I have stated the amplifier modulation has never occurred since the 47k resistor was installed but I can still get the woofer modulation when specific tubes are placed in the transporter. Is it possible that this modulation was being amplified by the preamp and sending the amps in to motorboating? If this is the case does it still point to the preamp being the problem because the circuitry is designed to have such a minimal impact on the signal that it lacks the sophistication to correct this?