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Original Message
In my case, goodbye 2a3, hello 2x4P1L
Posted by andy evans on October 11, 2016 at 12:17:25:
I used 2a3s until I discovered 2x4P1L outputs a few years ago. They sounded better in my system because I could use them in filament bias so no cathode bypass cap. And also being mu=11 I could drive them with another DHT, presently 01A with a gyrator, and just have a total 2 stages of amplification after my DAC.
Very similar to a 2a3 - 250v p-k and 18W dissipation maximum per pair. You can run them up to about 35mA each or 70mA as a pair.
Needless to say, they obliterate all the other output tubes in terms of economy of use. I bought 150 at $4 each back in the day. Never used another type of output tube since. I'm happy!