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In Reply to: RE: Input tube suggestions? posted by Genp on July 11, 2016 at 13:28:37
If you're after full power from the 300b I don't think the 6dj8 will give it.
The 6dj8 has a plate voltage limit of 130vdc. Depending on idle current and load line I think there's only about 50 volts peak before it hits 0 grid voltage and grid current.
The 6922 can take a lot more plate voltage.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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Thanks. I realized I didn't make myself clear. Just trying to match the triode 2 of 6EM7 (low rp) with another input tube instead of section 1 (high rp, gain of 64). There is too much swing (around 240V peak) right now. One possible solution is to replace the first section by another tube with lower gain. It could be also a complete different tube but it has to be low rp ( <1.2k) as driver.
!
The Mind has No Firewall~ U.S. Army War College.
I have been using a DIY 91A clone for my main amp for quite a few years and I have tried the 310A, 6sn7, and the ef37a as driver tubes. So far I like the sound of the ef37a the best. It's just a drop in, no design changes required that I recall.
Edits: 07/12/16 07/12/16 07/14/16
What about a 6sn7? It's a very linear tube.
I don't know your circuit but let's say you get a gain of 15 out of the 6sn7 input stage and a gain of 4 out of the driver stage.
That gives you a gain of 60 so 2 volts RMS IN would give you 169 volts peak at the grid of the 300b.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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