Brands That Died

FWIW, Threshold Audio still exists, but without Nelson Pass.  After founding Pass Labs, he sold Threshold.  The company is now based in Texas.  They're using STASIS kind of like a product line name (also applying the term to their preamps), but it appears that they did acquire rights to the patent as well.  Some of their power amps specify having a Stasis output stage.

Dynaco Stereo 70

The Dynaco Stereo 70 is a vacuum tube power amplifier introduced in 1959 by Dynaco, designed by David Hafler. It was one of the most famous and widely used tube amplifiers ever made, selling over 350,000 units during its 17-year production run. Marketed primarily as a kit (Dynakit), it offered exceptional value and performance, becoming the gateway to tube audio for generations. The amplifier was available in both kit and factory-wired forms, with the assembled version priced at $130 at launch. 

@kerrybh 

"AI can be useful if its used as a starting point and even then should be taken with a big grain of salt."

You can't even take it with a small grain of salt but that won't stop people from relying on it when its convenient for them!

Acoustic Research AR, was the speaker to have in the 1960’s. I’m still listening to a pair of AR 2ax gems. 

Whatever happened to Boston Acoustics? They were really popular in the 80s/early 90s.