1974x Crazy Noise from Non-Tremolo Channel


My 1974x amp is quiet when nothing is plugged into it, but as soon as I plug my intrument cable into the non-tremolo channel, I get this awful cyclic noise.  Does anyone know what to do?   I replaced the ECC83 tubes one by one (testing it between each tube replacement), but it didn't fix the problem.

Here's a video of my problem.



asked 19 Dec 2019 at 11:10 PM

Brandon Isaak
Check the fan ground and the ground on plug . I use a plug in box with a ground wire going outside to its own ground rod . When playing at different places it’s a must - Kenny Rowe 25 Dec 2019 at 04:04 PM
Answers: 1


Hi Brandon,

Thank you for details on you issue, it sounds like it  could be a power supply issue, have you tried another guitar and lead, we would recommend it is looked at by an engineer to check this over.


Marshall Support

answered 20 Dec 2019 at 09:26 AM

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