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In Reply to: RE: Could someone summarize all this? posted by Frihed89 on March 13, 2015 at 16:15:31
It wouldn't, despite the fact that the 2.5V filament doesn't vaporize on 5V, lifetime will be drastically reduced.
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But if the filament supply was changed to 2.5 volts and the bias was checked and adjusted to the 300b levels, the JJ 2a3-40 should work well in 300b amplifier circuits.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Has anyone ever compared them to the JJ 300B. They are about the same price.
Vinnie, yes, I've now compared them, though with the 2A3 at an elevated heater of about 3.5v. I'd say the 300b is darker and not as transparent in the highs. I was comparing them yesterday using a variety of music ranging from Allison Kraus to Pines of Rome. I do feel the 300b has a bit more grunt in the low end (even though Pd on both tubes was running about the same). Overall, if you have the speaks for it, I'd use the 2A3. In my "accidental" set up, I am planning now to lower the heater to about 3v and just run the 2A3-40 tube. I don't think I'd try any other 2A3 in these conditions, just to be clear. And, FYI, my speakers are similar to Wayne's tremendous 4pi speakers. JBL 2226 on bottom, B&C 250 on top. About 96 to 97db efficent.
Why not drop the filament voltage to 2.5 volts and see what you get?
You will, of course, have to reset the bias.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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