| Help for an acoustic 140 head
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Hi everyone. This is my first post. I have an Acoustic 140 head from to late 70's. It has developed a hum. I still get the bass signal through along with the hum. I believe it's the filter caps in the power supply. I've checked all the basic things like cords and the bass itself, all fine. I was wondering if anyone would have a schematic for the 140. I have checked online and so far no luck. Any help would be greatly appreciated. Thanks in advance. | 
