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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: RE: Input tube suggestions? posted by Paul Joppa on July 12, 2016 at 21:27:01:
Hi.
Maybe the 6922/6EM7(L-µ section) combo could be interesting.
(Keep in mind 6EM7 H-µ section with an unbypassed cathode resistor)
This is how it looks:
6EM7 Low-µ
operating point: 160V, 42mA, -24V
plate diss.= 160V x 0,042= 6.7W
rp= 900, S= 5.6 mA/V, µ= 5
Rk= 24V/42mA= 571....560R
6922/E88CC (according Telefunken datasheet)
operating point: 90V, 6mA, -2.2V
rp around 4k, S= 8mA/V, µ= 30.5
plate dissipation=(90V x 6mA)= 0.54W
drawing line from 250V leads to 9.3mA...
...giving plate resistor of 27k
Rk= 2.2V/6mA = 367...360R
Gain= (µ x Ra)/(Ra+rp), Ra=22.9k (27k II 150k)
= 26
The 39µF cap should be Solen, Axon or similar
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- RE: Input tube suggestions? - Genp 18:37:21 07/18/16 (0)
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