Fender Reverb Amp: Hum-elimination

My Silverface Fender Princeton Reverb was humming as soon as I turned on the Reverb. I could exclude numerous sources of error. Then I found out, that the mass-copperplate did not have sufficient contact to the chassis. By tightening the nut of the input I could eliminate this fault. This is the video:

Liked it? Take a second to support Delay Dude on Patreon!