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In Reply to: RE: Goodbye Type 45 ....... hello JJ 2A3-40 posted by drlowmu on October 10, 2016 at 11:34:51
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!
Follow Ups:
Andy, Any chance you could post the schematic for your 2x4P1L with filament bias? If you don't want to post it, then possibly email it to me.
Thanks,
Pat
banpuku@mac.com
.
Don't doubt you one iota Andy !! Q. : But....were you using a JJ 2A3-40 in your system ???Jeff
Edits: 10/12/16
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