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For anyone that might encounter this issue:
Here is a mod I used to mute the power output stage in this amp. The digital board upon power down was creating a really loud 'CRACK" sound.
Replacing the Digit board had no effect. I could find nothing anywhere that would cause this issue feeding the digital pcb, so I stole a ckt from a Marshall to use with the onboard POWER ON mute ckt.
I can't for the life of me recall which Marshall amp I stole the mute ckt from.
I built the ckt on a small breadboard & mounted it on the left front side of the power board. It worked like a charm & I haven't heard back from the cust in months. BTW, he agreed to pay for the ckt as he just couldn't live with the noise at power down.
Find attached the schemo & mod added. It will probably be really huge, so open it in paint & reduce the size. glen
Here is a mod I used to mute the power output stage in this amp. The digital board upon power down was creating a really loud 'CRACK" sound.
Replacing the Digit board had no effect. I could find nothing anywhere that would cause this issue feeding the digital pcb, so I stole a ckt from a Marshall to use with the onboard POWER ON mute ckt.
I can't for the life of me recall which Marshall amp I stole the mute ckt from.
I built the ckt on a small breadboard & mounted it on the left front side of the power board. It worked like a charm & I haven't heard back from the cust in months. BTW, he agreed to pay for the ckt as he just couldn't live with the noise at power down.
Find attached the schemo & mod added. It will probably be really huge, so open it in paint & reduce the size. glen
Attached Files