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Old 12th Aug 2018, 9:49 am   #16
ms660
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Join Date: Apr 2011
Location: Cornwall, UK.
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Default Re: Marshall JTM45 Guitar Amplifier- Mains (Primary)Fuse Blows

Quote:
Originally Posted by 'LIVEWIRE?' View Post
B.t.w., Lawrence, I only mentioned Bias, because I'd been given a message from the owner about the Bias, but didn't know exactly what he meant. After almost 50 years repairing electronic gear I know that grids should be negative w.r.t. cathodes. Perhaps the owner, to whom I haven't spoken personally, suspects there may be a fault in that part of the circuit.
No problem, the -ve supply is due to the diode (-ve out) that you were unsure about.

Lawrence.
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