That's perfect, Ric has probably a whole lot more valuable to say than me.Tim,
I'm sending you a P.M..
My bits and pieces of things read and heard: Problem with the Electracoustic series is not so much obsolescence of parts, but rather lack of circuit documentation/schematics. Walters policies were pretty secretive around his later designs. There are folks who can repair them anyways, but they are few and far in between. (I do know one I would trust).
But, IMHO, 16 years is nowhere near an issue with WW amps. Even though the older MI100-8 amps like mine are a different beast altogether, I have one from 1979 and it works like a charm. It had one bad solder joint last year, but that was an easy fix.
As far as value is concerned, I couldn't begin to guess. All I have heard is that recently, arguably due to the vast competition of mass-produced mini amps with loads of power and no weight, but equally due to Walter getting older and reportedly not as readily available for service as he used to be, the prices began to drop. I have always considered them to be "reasonably premium-priced", meaning "deserved expensive due to sheer and utter excellence". Remember, Walter Woods always was a one-man company, with one guy designing and hand-building any and every single amp, without using ANY prefabricated OEM modules. At the same time being cutting-edge technology for the time. That sure comes at a cost.
Best
Sidecar