12AX7 tubes for Counterpoint NP400

I have 12ax7 in my phono stage.The sovtek Lps is a quiet tube but a little bright.I had them but bought Telefunkens which are even quieter and sound MUCH better.I bought 2 from Kevin Deal @ upscale audio.$35 each.No you only bias ouput tubes 6550,EL-34 etc.

contact Christian at Electron tube valve.He will be very helpfull.www.electrontube.com

My favourite affordable (relative term I know) 12AX7s are; Amperex, Telefunken and Mullard. Sure they cost more than a Sovtek, but in the context of the price of an amp the money is very well spent. In my system I find the Amperex is best, having warmth and the best dynamics. The Mullards are a little relaxed. The Telefunkens are often considered to be the best but the better dynamics of the Amperex wins out in my view. You do not need to worry about swapping one 12AX7 for another - issues of biasing only apply to power tubes.

The Sovtek 12AX7 is an okay sounding tube at best. If you are looking for good advice and very nice pricing, try Triode Electronics in Chicago. (773) 871-7459. Their hours are quirky, so keep trying. I have been buying vintage tubes from them for years.

I don't know about the counterpoint but I use Special quality Mullard M8137 box anode valves (Tubes)in my Art Audio Tempo Mono blocks,Art Audio VP1 Pre Amp and Sound Audio (from Hong Kong) phono stage with great success. The M8137 is a SQ version of the Mullard ECC83 (12ax7) and was produced by Mullard to the highest military spec although it was available of the industrial market. I have a Mullard Tester and the M8137s have perfectly matched halfs remarkable!! I also have various 12ax7 Telefunkens and to my ears,and importantly in my set up, the M8137s do sound "better" I would also recommend the sister Mullard M8136 which is the Box Anode High Spec ECC 82's (12au7).Look out for the Brimar "Trustworthy" range that is often overlooked again Industrial / Military spec and very fine performers. Hope this helps.