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thanks for all the suggestions guys...I've tried a few things

Tried DC on the filaments....didn't help at all, maybe even worse. Rerouted my grounding a bit, maybe helped a tad. One thing I notice is that when nothing is plugged into the input then the hum is lower (in the 3 mV range across the speaker terminals). I have not shielded the wire from the input jack (back of the amp) to the grid of the driver (front of the amp); can that cause hum in both channels? I think I'll put in a shielded cable just in case. Another thing I did which may not have been too smart was to locate the rectifier tube right in between 2 of the 6DN7's (about 1" away from each), looks cool but maybe it's imparting some hum as well. When I play music it's of no consequence so I guess I can live with the hum if I can't get it to go away. Thanks again!


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  • thanks for all the suggestions guys...I've tried a few things - microbe 20:43:51 04/21/07 (1)


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