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SET Asylum Single Ended Triodes (SETs), the ultimate tube lovers dream. |
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SET Asylum Single Ended Triodes (SETs), the ultimate tube lovers dream. |
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In Reply to: Input tube suggestions? posted by Genp on July 11, 2016 at 13:28:37:
Well I've mucked around with a very similar 3-stage cct & here's my 2c worth.
1-The low gain portion of the 6EM7 used as the IT driver sounds best with 25ma + of plate current I see you have that covered great more fulsome sounding. Quite often you see design with plate current <15ma in this configuration - no good. The 6EM7 is a robust valve & happy with AC heaters one of the virtues of IDHT.
2-Found the high gain portion of the 6EM7 used as an input valve to have way too much gain & also a bit bland sounding. Swapping input to a 6J5 requires an additional valve but LC coupled (Lundahl 1667-15ma) at 160V P-k @ 10ma to the low gain section of 6EM7 is excellent sounding. 6J5 can also be run on common 6.3V AC heaters with 6EM7. Way better sounding more character & a lower noise floor to boot. Hum at spkrs was <1mV. If tempted you can use this cct with some of the more robust 300B design made from EML like there 520B or XLS versions.
Cheers Johno.
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Follow Ups
- RE: Input tube suggestions? - Johno 02:56:23 07/13/16 (2)
- RE: Input tube suggestions? - jetrexpro 05:44:31 07/13/16 (1)
- Webster output transformers - wclarson12 08:18:52 11/20/19 (0)
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