Jadis JPL preamp owners please help

Thanks Rcprice, my JPL has (3) tube sockets in a row towards the front center and (1) tube socket towards the right rear from a view looking down at the layout. You are probally correct about the 12AU7 being near the CD input which I never use, Best Reguards, Johnny

My original JPL only had the three 12AX7s, which are the amplification and cathode follower tubes. I recall that some JPLs also had a buffer tube for their CD input, that may be your 12AU7's function. If there are three tubes in a row and one by itself near the CD input, that would be my guess. You can e-mail Jadis in France (look under ecrans jadis) with your question, just also give them a serial number and a few days to respond.

Incidentally, while that tube buffer may have been nice for early CD players, I don't think you need it now if you have a good recent CD player. The best sound out of the JPL's inputs in my experience was through the tape input; I'd use that for the CD, unless you primarily listen to vinyl, then use that for the phono stage and AUX for CD.