25-05-2017, 08:32 PM
The contact cooled rectifier in the 2022 may be OK. There was a loud hum when I first switched the amplifier on, having found an ECL86 to replace the missing one. This was due to the reservoir and smoothing caps both being low value (<16uf instead of 32uf) and, perhaps more importantly , having high ESR. The rectifier produces readings on the ohms ranges of my DMM which make no sense to me, but then I've forgotten what readings to expect from such devices!
