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RE: JJ 2A3-40

jaderust, hi. The JJ 2A3-40 and JJ 300B may share commonalities: same
size glass, same anode structure but there may be other differences not
easily measured without sacrificing tubes - distance between grid and
anode (which is a major determinate of amplification factor) and grid
pitch. I think the thing to remember is the tube is a dynamic system.
As anode voltage increases the reflected impedance the tube wants to
see as load increases. The Type 50 is very close to 300B but they don't
sound the same. I have not constructed an amplifier so as to compare
JJ 2A3 to JJ 300B. It would be interesting to do. I have an amplifier
where it is possible to directly compare 300B to 50 which prompts my
comment above. Even if what you say is true that tube is going
to behave and sound different operated as an old stock 2A3 rather
than a 300B. The JJ literature states you can operate the JJ 2A3-40 at
300B voltages and currents (for example) they show classic 2A3 voltage and current as nominal. In other words - treat the JJ 2A3-40 like a classic 2A3 and reap the sonic benefits. Capisci?


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  • RE: JJ 2A3-40 - elektron 03/6/1208:59:30 03/6/12 (1)

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