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Old 2nd August 2003, 05:21 AM   #1
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Default hum in only one channel

I've built this pre-amp. It seems to work well in one channel but the other has a definite hum in it. The hum doesn't seem to be coming from the power-supply, as one channel is fine. It's definitely coming from the pre-amp and not somewhere else along the line. Any idea as to what the likely culprit is?

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Old 3rd August 2003, 05:15 AM   #2
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The link I've got above doesn't seem to be working too well.
Here's a link to an identical schematic, shown in Figure 2, from the ESP website:
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Old 3rd August 2003, 08:37 AM   #3
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Hi BM,

How loud is this hum???

There must be something wrong with that channel.

Have you compared the two PCB's. Place them side by side and check every single component (color codes, polarity etc.).

If you don't find any faults there, I think it must be a bad soldering. Resolder all components.

Please keep us informed.
Free Schematic and Service Manual downloads, Company:, Joint venture:
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