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In Reply to: RE: Input tube suggestions? posted by Genp on July 11, 2016 at 13:28:37
I would use a different dissimilar dual triode like the 6DE7. The input tube had parameters more like the 6J5.
Follow Ups:
I did check some dissimilar triodes tubes. 6DE7 is used in Woo audio headphones amplifier. It must not be bad...
There are many dissimilar dual triodes with differing parameters for the two sections. I think they can make good sounding amplifiers - the first amp I designed on my own used the 6DN7, a tube of which Paul Joppa has a lot of experience.
PAUL! HEY PAUL!
What do you think of 6DN7 for driving a 300B? :)
I want to thank everyone for all replies until now.. More than I expected!
Many options are "on the table"...
The easy way is...unbypassed cathode resistor for 6EM7 high µ triode for lower gain (a bit over 20dB).
If 6EM7 high µ triode is not used:
Around µ=20: 6SN7, 6J5, 6C5 (similar to 6J5 with slightly higher plate resistance and lower transconductance), 2C22/7193...
Around µ=30: 6DJ8, 6922, 6N23P...
Those two last categories could be used with CCS and LED biasing.
Also, a different dissimilar triodes tube with different specs is possible, like 6DE7. However, how is it linear for an adequate gain?
Finally, some guys suggested a completely different approach. Even if their results are quite good, it wouldn't be my first choice.
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