2. amps-preamps
  3. 1298234352

Conrad Johnson PV-12A - Remove Phono Board?

Hi,

I have a CJ PV-12 Preamp that I would like to remove the phono board from and turn it into a completely separate phono-stage. Anyone know what exactly might be involved in performing such a project? I love the CJ's phono section but a friend wishes to purchase my PV-12 but does not need or want the phono section; rather just a linestage version.

I would love some technical knowledge and expertise here as I am fairly able to perform minor audio surgery but would love an instructional from anyone who might know how to do this :)

Thanks!
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Showing 1 response by detredwings

detredwings
162 posts
 
Well this would take some work. You would need to build another power supply to start. The power supply will have it's own sound so you would need to copy it. It's been years since I looked at a PV12 but if I remember right the transformer is tapped for the B+ and heaters?

So you would need another transformer, case and parts. You could get another power supply "different" but it would change the sound and character of your preamp. But if you have the skills for DIY give it a go.

If you really want to do this there are schematics available for the PV12. You could send me a couple of pictures and I would be happy to guide you a little.
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