Call Kevin Deal at upscale audio. He should be able to point you in the right direction. I believe he prefers the Mullard tube. http://www.upscaleaudio.com/index-2.htm
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I used to have the CJ premier 14 pre amp and it too uses the 6gk5. For the premier 14 I prefer the mullard 6gk5. Sylvania was noisy and the GE was too rich in the mid range for my taste. mullard has lots of air, details and very transparent. I do have a pair of mullard 6gk5 and a pair of sylvania 6gk5 that I no longer need. Send me your address and I will send them to you (free). If you like them, keep them. If you don't, then pass them on to the next person who needs them. They tested good in tube tester.
Hi Like the other that preceed me I also use now some mullard that i found at« http://www.tubeman.com/itm00057.htm» and they are better sounding than the original c-j GE and like you i own a pair of Scintilla, C-J premier 10, P-2 D-2, and a pair of Krell Reference Serie mono amp, 770 mit reference for speaker and 330 and Cardas Golden reference for interconnect