1974x Crazy Noise from Non-Tremolo Channel

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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.

https://youtu.be/lN_lhUAu7jA

Tubes noise ECC83 Marshall broken repair 1974x Marshall1974x

asked 19 Dec 2019 at 11:10 PM

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 - 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.

Regards

Marshall Support

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asked 19 Dec 2019 at 11:10 PM

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answered 20 Dec 2019 at 09:26 AM