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Original Message
Re. positive feedback and RF oscillation
Posted by sser2 on March 15, 2017 at 17:29:55:
Whether or not Miller capacitance neutralization would cause instability is an open question. With high transconductance tubes like 2A3, RF oscillation is inherent to the circuit. Accordingly, neutralizing capacitors may actually block oscillation rather than promote it. That is the opinion of Mr. Marshall, the author of the Audio Engineering article.