Help!
I have a Marshall JCM 800 who are rather noisy at High input. I post a video here where you can hear the noise when I put in the guitar at high input. I have tried with 6,3 DC filament for the two preamp tubes, no result. I have change the jack input set at the front. In the video you can see the cables from the input jacks to the tube. They are grounded at the potmeter.
I have a Marshall JCM 800 who are rather noisy at High input. I post a video here where you can hear the noise when I put in the guitar at high input. I have tried with 6,3 DC filament for the two preamp tubes, no result. I have change the jack input set at the front. In the video you can see the cables from the input jacks to the tube. They are grounded at the potmeter.