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Original Message
RE: Best Quiet Pre-amp 6SN7 New Production Tubes ................
Posted by tubemaze on September 6, 2020 at 15:15:31:
try 6SU7GT tubes, they are supposed to be quieter. Although based on my tests, they also show noise around -86 dB, which is the same as for example as a regular Sylvania 6SN7. New production, showed even worst performance with Full Music at -84 dB and microphonic, but EH Gold did as well as 6SU7, at -86 dB. 5962 didn't help with that either, measuring at -86 dB. Since 6SN7 is a low-gain tube, noise is not a major issue (if the tube is strong, the weaker the tube, the more noise), but microphonics are due to a large plate structure.