Don Sach's pre amp

I have the same selection of NOS to include WGTB and RCA 5692 and in a previous Modwright Sony 5400 CD Player which utilizes 6SN7s, the CV 181-Z walked all over my NOS tubes; not even close...

Wig

Since the website does not list specs, I have a question. Is Don's preamp using cathode-followers for the 6SN7 gain stage?

Also, if this is a single gain stage, is it sensitive to microphonic tubes? I assume you are all testing for low- noise?

@wig 

In my tests, the NOS tubes walked all over the CV 181-Z. If these tubes were as great as you say, the NOS 6SN7 market would dry up in a New York minute....

@ porscheracer

It's all circuit dependent and my NOS tubes smoked the CV-181Z in my Line Magnetic SET Integrated Amp. A good thing for us is that we do not have to go out and procure these treasures, just choose the ones that best represents our listening pleasure.

The CV-181Z are quite special if used in the right circuit and this has been talked about by some serious tubes critics over the years.

http://www.tnt-audio.com/accessories/shuguang_treasures_cv181_e.html

Wig

I tried them in a preamp and they didn't sound great.....I guess I will see as I have a paired ordered with my Don Sachs preamp.