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Conrad Johnson PV10AL Tube & Polarity Questions?

I don't have the owners manual for mine but I thought I read somewhere that the CJ's invert polarity? Is this true because it sure sounds that way in my system. I also would like to experiment with changing some tubes around. I listen to Rock & Roll. I have a pair of Tylo Monitors, Mc Cormack DNA-1, Philips 963SA with DH labs cable. I have never swapped tubes & have no idea what should be in there or is what in there at the moment. Where do I begin?
fishwater
czbbcl's avatar
czbbcl
1,699 posts
 
You can contact CJ for a copy of the manual, they will be more than happy to answer any questions. But if I remember correctly the PV-10A does invert polarity which means if you have an odd number of invertions you must reverse your speaker leads. If the unit is line stage only which is designated by the (L) it has no phono stage then there are only two tubes inside. You can acquire access to the tubes by removing the top cover. If you go to the CJ web site there should be information there as to what type of tube is in the unit. Hope this helps

Chuck
herman
1,974 posts
 
It has a pair of 12AU7 tubes and does invert polarity.

Begin by taking out the screws that hold down the top plate. Be sure the unit is unplugged before you do this. To remove a tube, gently rock it a few degrees back and forth while pulling up. Some will tell you to wear gloves to keep oils off the tube but I don't think it makes any difference. The pins are not symmetrical so the tube can go back in only one way. Line up the pins in the holes and gently rock back and forth a few degrees while pushing down.
fishwater OP
178 posts
 
what tubes would anyone suggest to begin my first tube rolling experiment?
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