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Re: Strange Hum

9/4/2005 8:19 PM
Greg	Re: Strange Hum Wild Bill, Thanks, the shorting jacks are obvious and the non-shorting one, was only there as a diagnostic tool. I'm still wondering why I didn't get an open circuit hum, when turning up the volume with nothing plugged into it though. As for the 1meg resistor, I didn't realize that it was in the circuit when using the 'high' input. Now I think about it, it didn't matter which input I plugged into on the '54 Deluxe I used to own. On it though, there was no resistors on the mic input, only on the inst inputs. On Marshall style amps I've built, the 1 meg was only over the 'low' input, with no hum problems. Greg

9/4/2005 8:19 PM

Greg

Re: Strange Hum

Wild Bill,

Thanks, the shorting jacks are obvious and the non-shorting one, was only there as a diagnostic tool. I'm still wondering why I didn't get an open circuit hum, when turning up the volume with nothing plugged into it though.

As for the 1meg resistor, I didn't realize that it was in the circuit when using the 'high' input. Now I think about it, it didn't matter which input I plugged into on the '54 Deluxe I used to own. On it though, there was no resistors on the mic input, only on the inst inputs.

On Marshall style amps I've built, the 1 meg was only over the 'low' input, with no hum problems.

Greg