Author Topic: SS-20 issue  (Read 691 times)

alainsilva

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SS-20 issue
« on: May 13, 2016, 02:37:14 pm »
I have a SS-20. The Clean channel is working very fine. But the Drive Channel (using Crunch and Lead) I have a big problem. The noise is very high and do not allow using the drive. This happening after 3 minutes that guitar preamp is switching on. Anyone know how to help?

alainsilva

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Re: SS-20 issue
« Reply #1 on: June 11, 2016, 02:49:11 pm »
The problem was solved. But was very hard to resolve that.:)

Problem: In the AMT SS-20 the hammer noise is very high (seems sound of rain in the amp) in the Crunch channel and do not allow using the drive correctly. This is happening after 3-5 minutes that guitar preamp is switching on.
Root cause: 1 volt was mixing with audio channel.
Solution: Change the circuit DC with jump to DGC. Include circuit RO47X with GND. Include RO47X and 510PF 500 capacitors.