2. amps-preamps
  3. 1303178491

Preamp Suggestions to replace a CJ PV-12AL

I'm looking for suggestions on what route to take in replacing my Conrad-Johnson PV12-AL tube preamp, not having anywhere near the expertise of the members here.

I drive a Classe CA-150 amplifier and Snell D speakers, with an iMac as a digital source and Apple Lossless encoded source data via optical cable into the preamp via a so-so DAC (Keces).

I'm very interested in the Classe CP-800, if it will ever come out so that I can listen to it. I'm also thinking about a McIntosh C50, but am wondering if it would be worth the extra $1500 over the CP-800 (the local audio shop guy says CP-800).

I've also considered getting a better DAC, which would open up many other preamp options.

Thoughts? Opinions?? Anything would be greatly appreciated.
erickjmichel
erickjmichel OP
3 posts
 
Thanks! I talked to Bob, and I might go this route. Which mods did you do? He has a dynamic linearity mod, cap replacement, and two power supply mods.

This leaves the question of what DAC to use, though. Any suggestions? I'll check out the forums.

Oh, and I was looking for an upgrade, not necessarily a new sound. There could be some harmonics with certain tubes when they hit a certain age.
orpheus10
8,668 posts
 
NOS tubes are best for the PV-12, choose your flavor. I prefer the RCA Clear Top 12au7.
sabocat59
98 posts
 
start with the circuitry work and go a step at a time, although depending on the schematics the power supply mod and the circuitry mod may need to be done together.
erickjmichel OP
3 posts
 
Just an update for those that recommended doing the RHB mods. I went with both the circuits and the power supply/Vcap mods (including an iec receptacle for a new Synergistic Research power cable), and it sounds spectacular! The irritating issue I had with the CJ is totally gone after the mods. I dived back into the tube world again, buying a tube tester to get deeper into tube rolling. Which brings me to another question. I've tried some RCA clear tops, and Telefunken smooth plates - any tubes I have to try for the C-J with mods?

Anyway, thanks for the advice - you were right!
markwatkiss
508 posts
 
Playing the devils advocate here.Don't get caught up in the after market mods,when it comes time to sell,and it will,cos that's the nature of this addiction,you'll get back about.25 cents on the dollar.My experience,wait for one that is already modded.
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