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In Reply to: RE: Baby-O is ok posted by Gordon Rankin on March 25, 2022 at 13:28:42
My Emission Labs 2A3 look to be a single plate 2A3.
And sound great.
Follow Ups:
They DO sound great! (EML).That's because they're true single-plates,
are built very well, AND ARE MADE FROM
GOOD METALLURGY, with really solid glass
envelopes, and superior internal vacuum.Biplates were made for radios. So were
45's. A single-plate 45 usually has a "W"
or "M" shaped single filament. So do Western
Electric 300B's.While these tubes are indeed pleasantly euphonic,
the skewed filament arrangement changes the
behavior of the tube to accentuating some tones
in music, and compressing others.The original RCA single-plate RCA-Cunningham
2A3 had all of its filament arranged into
straight-vertical strands welded onto horizontal
rods, one at the top of the filament structure,
another horizontal rod at the bottom of the structure.Musically, this tube is linear. They cost RCA
too much to produce (all the welding), so the
BiPlate 2A3 was made from the 45 tube's parts,
and replaced the only GOOD 2A3.Today, EML still builds the vertical, welded,
filament system as Alesa Vaic (AVVT) designed
them. This 2A3 greatly outperforms the original
RCA-Cunningham single-plate!JJ makes a lower-cost (but well designed and built)
version of this, called a JJ 2A3-40. The "40" means
forty watts max plate dissipation rating..This tube uses their 300B plate and glass
envelope, etc. The filament is a single run
of filament wire that runs on 2.5 volts by
itself. The grid system is set up for 2A3
parameters.JJ avoids the serious distortions
that are in the W.E. 300B tubes, and in single
NOS 45 tubes by arranging the single filament
to be squared-off at the top and bottom of
the filament structure, allowing the portions
of it that are exposed to the plate and grid
to run purely vertical.While this is a compromise compared
to the original RCA, and the current EML, it
is the biggest tube bargain out there. You
get excellent glass envelope, superb internal
vacuum, and extremely long life. These tubes
have decent metallurgy-- they're not the soup-can
materials of NOS radio tubes.You also get the same plate-dissipation rating
of their 300B-- 40 max. watts.JJ's 2A3-40 greatly outperforms their 300B, as
they hint at on their website. I KNOW it does
just that because I prefer to listen to them and
have thousands of hours on many examples.Although this tube is a winner, you do have to know
how to use it. It doesn't sound like any other triode--
of any kind. That's not the question, the question
is-- can you build a world-class amp around one of these?YES, and you get a lot for your money. Long life,
fatigue-free listening, superior dynamics, powerful
lows and superb, extended highs.All you have to do is a little work on your power
supply for it, and it will surprise you!-Dennis-
Edits: 03/30/22
Big J
"... only a very few individuals understand as yet that personal salvation is a contradiction in terms."
Come September I'll have 11 years on my JJ 2a3-40.
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