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squeal

  1. PE9ZZ

    Sugden A21a squeal, utterly baffled

    This amp has an unusual topology. The class A amplifier has a single power rail and as such is capacitor coupled at its output. The A21a is a revised version of the older A21ii and now has a buffer between the input stage and the output stage. There is no VAS, this is taken care of by the output...
    • PE9ZZ
    • Thread
    • parasitic oscillator squeal sugden a21a
    • Replies: 15
    • Forum: Solid State
  2. tusntuk2

    Kenwood KR-5600 Strange Tone Problem - Know what this is?

    I'm rebuilding a Kenny 5600. Original description was "one side out", and all the lamps are out. This improved some with deoxing the controls, but there were two anomalies. The FM had terrible distortion on one side, and while checking a signal thru the AUX, the Treble control, when turned...
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