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In Reply to: RE: 6EW7_2A3 Parafeed PP posted by nullspace on October 06, 2009 at 10:50:09
John,
I’ve used a few 6EW7s, but none as a P-P driver like you have. What is your plate to cathode voltage on the high mu triode and the lo-mu triode? I expect there is a bit of voltage drop over your CCS.
You do not show a grid bias on the 2A3, I assume you have cathode resistors, are they bypassed? Why the 8.2uF blocking capacitors between the 2A3 and outputs? If those are stock S-240s you could try pulling those out. And then at some point you could pull out the 2A3 plate chokes and see what that does to the music.
You could try to go straight from the plate of your hi-mu driver to the splitting choke and see what you think. I don’t know what you have as sources but the gain should be enough without the lo-mu triode. If you have a suitable choke, EXO-099, you could pull the CCS and choke load the hi-mu then straight to the splitting choke. You could put the BCP-15 below the lo-mu section and drive the splitting choke from the lo-mu cathode. These are all pretty easy things to do and listen to see if any get you closer to what you are looking for.
Matt
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