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841

I've never really experimented much with the 801A, but can tell you that the 841 sounds very similar to the 10/10Y - just with more gain. Crisp and super-clean with nice frequency extension, it mates well with non-thoriated DHTs like the 2A3 and 300B.

As far as R(p) goes, I'd guesstimate that it's well under 30k as long as you draw some current through them. My op point: B+ of approx 385 vdc, R(k) of 750 ohms, drawing about 5 mA. Full frequency response with a 600 Hy Magnequest EXO-99 plate choke.

NOTE: I have used them successfully with a B+ as low as about 275 vdc, but prefer the higher voltages.

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  • 841 - Jim Dowdy 04/17/0906:47:38 04/17/09 (3)
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