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Due to a slight hum in the lead channel, I've descided to do some experimenting with pre amp tubes. I know there's a lot of writing done, but still, I want to share my experiences. First of all, I'm the proud owner of a 1991 Mark IVa bubinga combo. In the past, I've changed the inner 6L6 power...

FWIW, I had same problem with other amps. Mostly the reason is bad shielding of the cables you are using, or a bad grounded amplifier. Allways make sure that the amp is thoroughly grounded. I know there are amp manifacturers who are putting an RF filter just after the guitar input. It's a...

Hello, I'm new to this board, so, while reading previous post: I've got a Mesa MarkIVa combo, Serialnumber 1995. It has 2 EL34 Svetlana Winged C tubes, 2 Groove Tubes 6L6GC and EV speaker in it. For the rehearsels, I'm using a Sovtek Mig100 with a 4x12 inch original vintage Celestions 12H30...