4.2.1 Microphonics and Bad Noises
The overall performance of pre-amp tubes is easily influenced by
externalmechanical factors. Malfunction in these external components will
manifestthemselves by a sudden, high-pitched feedback sound. The input
stage isespecially suspect to these phenomena. If one encounters
microphonic tubebehavior, then the first tube should be checked as a rule.
Pre-Amplifier tubes canalso cause a hum or other bad noises, like crackling or
ticking.
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