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I have the same problem as you,but i have rh150g3.hum, when is all knobs turns down...and guitar unplugged... anyone help?

hi.today i arriwed new valve...try change...still same...is inside fuse for poweramp?because preamp working...i try heads line out with another poweramp and sound is good....

hello. i live in United Kingdom.one week ago i bought in one Ebay shop NEW amp Randall RH150G3WC from Austria for 300 UK pounds + 25 postage.today amp arrived but when i switch this amp on.....silent.panel working,all leds lights,but not sound... i try check valve inside-12at7eh-and one pin is...