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RE: 2C22 is indeed much better

Thanks for the info, Andy, but I'm knee deep in the rewiring now. I think I'll stick with the 2C22s for now (I have a box of ~20 of the military versions from WWII in different brands - they are only ~$5-8 each, so it's easy to stock up on them); I'm also in the midst of tearing apart my speakers, so too many projects to do with so little time. No microphonics with the 2C22; you can tap on the glass, rattle the shelf, scream next to them - nothing.

Just curious - did you try the 2C22 with a constant current source on the plate and diode bias? The difference in going from a resistor to a CCS was at least as great as going from the 6SN7 to the 2C22.

I will definitely keep the DHTs in mind though - I'll probably build a preamp from scratch in the future and it will most likely be a DHT preamp, if I can overcome the microphonics issues.

Thanks again for the info.


Edits: 08/19/09 08/19/09
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  • RE: 2C22 is indeed much better - Maxamillion 06:08:31 08/19/09 (0)
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