Quote:
Originally Posted by emeritus
One of the old hands at Plessey once remarked that some designs that worked fine with early production transistors were prone to oscillate with later batches of the same type that had higher gains/frequency responses. The usual cure was to slip a small ferrite bead over one of the transistor legs.
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It's a known issue: power-supplies using the first 2N3055 series-pass transistors could sometimes turn into impressive medium-wave power-oscillators if you replaced failed series-pass transistors with later 2N3055s whose HF gain was higher as a result of improved manufacturing processes.