Question for tube aficionados

Actually on all 3 of these models we do employ grid resistors on all gain stages , typically a 47R5 resistor. All CJ preamps use grid resistors either 47R5 , 100R or 332R.

Thanks, Coppy. Good to know.

That information doesn’t appear to be consistent with the schematics I looked at for the PV-10 and PV-12 at HiFiEngine.com, and 47R5 (i.e. 47.5 ohms) seems much lower than usual for the value of a grid stopper resistor that would be effective in these kinds of designs. But in addition to the high confidence I would have in an answer provided by Mr. Fischel the bottom line would seem to be, as you said, that "their equipment consistently sounds so good."

Thanks again. Regards,
-- Al

I have no idea what you’re talking about, but I can tell you the preamp is terrific,
even after all these years!

Concerning the CJ PV11 amplifier, does anyone know if the two 12 AU7 tubes that drive the line stage have any effect on the phono stage at all, or do they just affect the line stage alone?

I have a Unison hybrid integrated which uses 2 12au7s in preamp end.  I have used two different Mullard 12au7s, RCA Cleartops, and Radiotechnique, but the Siemens 12au7 NOS (got mine from Upscale) beat them all.  Beautiful full bottom end, great midrange, and an open and fantastic top end, no brightness but crystal clear.  Wonderfully dynamic.

rvpiano, Check with CJ, but FWIW I can't think of a single reason why tube selection in the line stage would affect the performance of the tubes in the phono stage, except for the obvious one is that the phono stage signal passes thru the line stage therefor any tonal changes brought about by the line stage tubes will be reflected in the sound from the phono (or any other) source.