Question for tube aficionados

@newbee , you may be right. I traced the PV11 preamp back to at least 1992, so the Ei and Mullard could have been NOS. But CJ is now re-tubing the unit, and $310 is a very low price to include 2 NOS Mullards.

+1 lowrider57. I’m not suggesting that the CJ recommended tube option is a bad one. For that cost I’d would pursue the NOS tube pathway. I like the idea of trying the RCA tubes as earlier considered above. I’d have CJ clarify if their tubes are NOS or current production. Again their choices may be very good sounding. Truth is there are many good tube rolling options for the 12AX7 and 12AU7 family.

Charles

I have a VTL 2.5 preamp
I ran OEM 12AU7 JJ’s up until about 4 years ago.
I went to NOS 12AU7 Amperex Bugle boys - a significant improvement over the JJ’s
I just got NOS Telefunken 12AU7’s - another significant improvement over the Bugle Boys. There’s a new level of openness

I asked CJ what the tubes were, and surprisingly the reply was  the 12AX7 Mullards are NOS, the others are new production.
The question then becomes, which Mullards are included?

One word “ TELEFUNKEN “! I have NOS 12AU7’s ( E82CC, ECC82) in Telefunken , Tesla, Seimens , Mullard , RCA, Tungsram . They all are better than new stuff . They have distinct tonal differences . I use 5 different NOS rectifier tubes which raise or lower the voltage and effect my power tubes . So driver and rectifier tubes are all NOS. They last a long time . Power tubes - I have NOS GEC KT88 and KT66 , NOS Tungsol 6550 ( 3 hole ) , and SED Winged C 6550 and 6L6GC. They are better than current production tubes and more expensive. New production, I have Gold Lion KT88 and KT77 ( very nice sound ), Psvane TI KT88, Tungsol KT120, JJ KT77. Of the new stuff I am fond of the GL tubes . But for your application Telefunken NOS. FYI Brent Jesse’s site gives a very accurate description of SOUND from various tubes . FWIW, I have $3k in tubes for a $1500. Amp , so you see where this can take you 😝. Shoot me a message if you have specific questions . Happy Listening , Mike B.