I have a AD 200 bass mk 3 here with a loud buzz. I can kill it with the MV and by pulling v2 or v3 . The only scem i can find is on prowess amps but its not correct to this amp. This pcb is dated 2006. (ill try calling Orange tomorrow) , I tried clipping in a 50uf filter cap at all the plates v1/2/3 - it doesnt affect the noise unless i clip it to the plates of V1--but then i have almost no volume .
i did find about 18 vdc at the grids of V2 -- that shouldnt be there, yes ?
the shielded cable grounds are good
side note = theres a cap in here , that i think is a coupling ( traces are on both sides of pcb-cant see the bottom) , but its got strange labeling. Can someone decipher this ?
R60 MKT 400 A9 10MRL19
i did find about 18 vdc at the grids of V2 -- that shouldnt be there, yes ?
the shielded cable grounds are good
side note = theres a cap in here , that i think is a coupling ( traces are on both sides of pcb-cant see the bottom) , but its got strange labeling. Can someone decipher this ?
R60 MKT 400 A9 10MRL19
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