Defunct Company Gear Value

Jmcgrogan, I noticed nobody is dying to buy the SA-1s at $4750. Asking price is one thing, actual selling price is another. I have been following prices on many items for a couple of decades now and every once in a while a piece of stereo equipment will show up at a ridiculously high price. I know there are some variables in equipment pricing like cosmetics and how the equipment has been maintained, however, based on this site's blue book SA-1s sold new for $8,500 with a used price of $3,170.

Rrog, I got the $6000 list price from a 1986 Stereophile review. Perhaps the price went up and was $8500 when the model was discontinued. Still, even 37% is pretty good for a 20+ year old amp from a company that no longer exist. I paid around 22% for a 19 year old amp from a company that still does exist.

It clearly depends on the company. . . although it may be different between electronics and speakers. Just look at the price of a pair of Rogers LS3/5a.

The aforementioned Dunlavy and Threshold might be a bit unique in that besides having technical and sonic prowess that still compete with more modern offerings, they also have some type of support available.
The Threshold gear still has support through Nelson Pass' recommended ex Threshold tech Jon Soderberg of vintageamprepair.net as well as advice from Mr. Pass himself on diyaudio.com.
The Dunlavy's used mostly off the shelf parts, that for the most part are still readily available.

Unsound, You are absolutely correct regarding Threshold values. Once folks became aware of Soderberg and Pass Labs started up Threshold values immediately started to climb. However, I believe Dunlavy speaker values are strictly based on performance.