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In Reply to: RE: Mullard CV4004 or Mullard ECC83? posted by acass on October 15, 2014 at 10:56:28
I bought a lot of CV-4004 box plates for 50 dollars each and they were driver grade but they sound ok.I have 100s of 12AX7s of all types and my favorites are the Telefunken smooth plates and the RCA black plates and the Amperex DD getter.The 10M Mullards are superb but they are out of reach as are the Telefunken ECC803s.
Vintage Mullards are ok when they work but they turn microphonic at the blink of an eye..The New Sensor 12AX7s along with the 12AX7LPS are getting much closer in the right circuits and now I basically mix old with new to get the best sound.I also like the Raytheon 5751 windmill getter a lot in driver applications.
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Follow Ups:
The Mullard CV4004 besides being of driver grade are also excellent in phono sections. Provides a ultra low noise floor and an uncolored sonic signature.
This was verified with a group listening to various 12AX7 tubes with a highly modified Fisher 400 & 500 series receiver. Listened with JBL L300 speakers, a Garrard 401 with Jelco 750L tone arm, Grado cartridge & a custom 6922 based phono preamp that handily outperformed a Denon AU-340 SUT.
As odd as this reads, the only amp so far that can perform in the highly modified Fisher territory is an upgraded Marantz 8B.
So the RCA black plates are topping the list. Great being I am using them.
I contacted Jim and I'm ordering a backup set of 12AX7's. Tung-Sol
reissued ECC803S gold pins. I likee having a complete backup set of tubes to any amp I use and love.
charles
Excellent tubes you ordered.
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