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In Reply to: RE: Another Look posted by Paully on January 03, 2015 at 08:26:18
Looks like a RCA.
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Although I notice that the plate structure is physically split in half. The 2A3s I have it is one continuous stamping.
Which I thought was a bit peculiar. I am familiar with the the phenomenon with 12at7, hadn't seen a triode do that.
You will be a lot happier with any mono plate over a bi-plate. Don't fall for the myth of "Ancestor Perfection" . NOS is a bit like the first pressing noises about vinyl pressings. Sometimes older tubes are better and sometimes they are just worn out or inferior.
Lots of info at Jac's site re. Tube flashing plus many other interesting technical bits and bobs. A must read site for amp builders.
Smart
I agree jacmusic.com is a great site.
Ya so the best I can figure is that it is an RCA 2A3-D type, which has separate plates compared to the more common RCA 2A3-B type which has dual filaments and grids but sharing one plate. (Commonly called bi-plates)I can't comment on the flashing, but I suppose if it is unique to that "D type" tube then it may be OK>
Edits: 01/03/15
Either the amp you're running it in is unstable, or might possibly use a higher B+ than this particular Bi-Plate 2A3 can stand.
Biplates aren't the Cat's Meow. The JJ 2A3-40 is rugged!
---Dennis---
Just to clarify, the tube appears to be a "D" type dual-plate, not a "B" type Bi-plate, if that makes a difference.
Thanks for the help. The flash startled me at first because I wasn't expecting it, then it played wonderfully. So it seems to be good to go. Thanks again!
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