Threshold Amps

As far as I know, Threshold was founded about 1974 by Nelson Pass and Rene Besne. In 1988, it was acquired by a big corporation. Besne left the company in 1991 and Pass left in 1992. Thereafter, it appears Threshold's products were designed by Michael Bladelius, Wayne Colburn and others. Later Wayne Colburn became vice president for design at Pass Labs. Why did Threshold fail? The only symptom I see is that beginning with the "e" Series, the fullest realizations of Pass' original designs and introduced in 1990, everything acquired a part number, even the manual! A case of micro-management? Maybe. The later "T" Series amps used IGBT output transistors (as opposed to Mosfets) which are no longer available. As far as risk goes, the prices of Pass era Thresholds appear to be rising.

Rockvirgo: Thanks a million. Do the T versions have the same reputation as the Pass era Thresholds? What models nmight the Pass era be? Is it worth it to by Pass Labs or were the Thresholds just so good its worth the wait for the right one to come up?

See the Threshold Archives at http://www.rsvlonline.net/vintageamp/ Each model from Pass or Threshold has a slightly different twist, not to mention various looks. You must decide what is right for your needs.

I have used a Threshold s/300 for years always worked great never gave any hint of problems.Recently gone tubes still have Threshold amp will sell for the right price! looks and works like new. Not up for sale but e-mail if your interested csarachy@aol.com

I have S/1000 mono blocks, FET ONE & FET TEN pre amps. Which combination will make sound better on Martin Logan SL3 or old B&W 802 series 80?