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Original Message
4P1L in filament bias
Posted by andy evans on February 15, 2017 at 08:04:56:
I'd suggest using a 4P1L. Just 2 stages - no preamp needed with 2v in and sensitive speakers. Mu of 4P1L is around 11. Much more than 45. Also filament bias is an advantage - no cathode bypass caps.
The 01A Gen 2 preamp design is the best sound I've built or heard for an input stage. Good combination.