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Gallien-Krueger MB200

#21
The 200MB was the little steel box 100watt, 12”combo amp that upright players still seem to love. The MB 200 is the little 200watt head that came out as the lower power head only version in the current, class D “MB” line
 
#22
ok, here's an update. I replaced the two 10ohm fuseable resistors which are feeding the two 15 volt regulators. As suspected they burnt out straight away. Both regulators are good. To cut to the chase, the issues seems to be in the pre amp board at the front of the amp. When I disconnect the + and - 15 volt line plug form this board the both 15 volt lines are restored, fusable resistors are running cool. I unplugged every plug on the preamp board and once I put the power plug with the + and - it drags these two supplies down. having spent a few hours on it this morning i'm gonna have a break but im really confident that the fault is now on the pre amp board. Thanks for all your input.
Roger in Wales UK
 

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