Threshold/ What is the Stasis topolgy?

Write to Nelson Pass at Pass Labs.

He designed it.

Ph.D,

Couldn't find too much on this. However here are 2 links that *might* be of help:-

http://www.threshold-audio.com/discontinued.html

& this one is courtesy member "Mitja" from another thread:
http://www.rsvlonline.net/vintageamp/archiveamps.htm

The 2nd one is hosted by Jon Soderberg (formerly of Threshold) who now specializes in Threshold/Forte repair. He might be another good person to contact, if you haven't already. His home page appears to be:
http://www.rsvlonline.net/vintageamp

FWIW.

Thankyou very much for your input. Bombaywalla, you have especially provided some excellent information. I will call Jon Soderberg to find out more information and to see if this amp can be upgraded however I am reluctant since it may change what is already a very excellent sound. Maybe he can convince me otherwise. PHD

While delving through some of my Threshold archive papers the following was found on the Stasis topolgy.

Single or dual channel, non-phase inverting audio power amplifier employing circuitry to suppress voltage and current variation and enable performance to be dominated by a system maintained in a stasis condition of constant voltage/constant current, linear state operation. No overall negative feedback is employed around the amplifier system. No output protection circuits are utilized. Active constant current sourcing is employed at every gain stage.Power is sourced through a one kilowatt transformer and greater than a 70k microfarads capicitance.

Thats the basics of the Stasis topolgy. Your Threshold S 150 Series II is a further refinement of this technology.

I have an original factory brochure on this power amp I can copy and send you if needed.