Smallbox ground noise issue (preamp tube?)

T

tripstan

New member
So my Smallbox got alot of ground noise on the BE channel out of no where. It was dang near dead silent when I first got it. I'm thinking it's a bad preamp tube? Trying to trouble shoot so what slots are for the BE channel?
 
I had kind of the same issue with my Bogner Atma. It was almost dead silent when I got it but then I started to get a strange ground hum. Turned out to be a bad solder in the speaker out connections. We re-soldered the cables and the hum got alot better, I then replaced the power-tubes and the rectifier tube and now it´s as good as new.

Just a tip, but replacing the tubes is a good and easy way to start i guess.
 
Yes when guitar unplugged. Plexi channel has a tiny bit too. I'll try some different preamp tubes today.
 
Ground noise or is it picking up rf from something. Printer or phone or modem or?? Move the amp around does it change?? Different room?? Different place??
 
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