Ghost Notes - Use Scope to Track down ?

[HaroldBrooks]

Sorry, that schematic is the only one for my amp (that I've found) and it's got some serious flaws !

Yes there is a heater ground and it's connected to the cathode resistor to elevate the voltage.

Saw that myself on the schematic, and went to investigate, as that would be a big one for hum, but alas they did that right.

Thanks for pointing that out as that would be big if it was missed in the design.

Even when after I check something and find it OK, later on I forget what I did, LOL.


"Rael Imperial Aerosol Kid, Wipes his gun - he's forgotten what he did"

[soundmasterg]

I had what I thought was ghost notes due to oscillation or bad filter caps, or undersized filter caps on my 1993 Korg AC30 since new, and it was actually cone cry from the Celestion Blue speakers. Some very light doping on the edge of the cone got rid of it. It took my like 10 years to figure that one out and I bought the amp new.

Greg