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RE: How rugged are vintage 2A3 tubes?

"At some later date a biplate or dual single plate version was introduced. This appeared to simply be two single plate versions in parallel inside the same bottle. Since adding tubes in parallel doubles the transconductance and keeps the ยต the same the resultant rP would be 1/2 that of what a 2A3 should be. Parallel tubes also mean that each individual tube would need 1/2 the gm / double the Rp to meet the 2A3 specification when paralleled. This also means that the filament current and plate dissipation would also double. "

Nothing could be less logical than what you already came out with.
Paralleled valves have big advantages, especially in regard to lower shot (random) noise levels.
How do you have any idea, these valves didn't have the entire curves and spec specially re-arranged to make exactly the same parameters as the single anode versions?

Sheer speculation?


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  • RE: How rugged are vintage 2A3 tubes? - ivan_terrible 07:58:35 10/26/20 (0)

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