Postby GuitarBuilder » 04 Jun 2016, 07:14
Linster wrote:I have a JCM1 Head and Combo along with a JMP1 and a JTM1
Both JCM1 amps seem to make noise when cut on without the guitar plugged in where the others are mostly dead quiet. Like the input is not grounded.
Now my JCM1 combo is acting very weird, when plugged in like there is an issue with the input jack.
Any suggestions on what to look for?
Thanks
Can you describe the noise? Is it an AC hum or a hiss? Does the Boost button make it worse?
You can test the input jack by creating a shorting plug (tip and sleeve shorted).
Marshall 6100LM - 1960A Cab/G12T75
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Marshall JMP-1H - 2061CX Cab/G12M20
Marshall JCM-1H - Avatar G212 Cab/Vintage 30
Marshall DSL-1H - Avatar G212 Cab/G12T75
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