Besides overdrive- and compressor- shootouts, videos with DIY instructions and modifications you will encounter comparisons of numerous analog and digital delays by various manufacturers like Electro Harmonix, Chase Bliss Audio, Fulltone or Strymon.
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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: