I telephoned Spectral a couple days ago and was transferred to "Mark" in the service department for a brief but informative conversation. I learned from him: (1) In general, if a Spectral amp seems to be working fine, there is absolutely no need to send it in for evaluation/service. (2) Even a 20-year-old Spectral amp is still quite young; they are designed and built to mil spec standards. And (3) the DMA-90, in particular, is an extremely robust amp, quite bullet-proof!
So, it seems my concerns about maintaining a--another--nearly 20-year-old Spectral DMA-90 would seem to be unfounded, which is terrific news!
So, it seems my concerns about maintaining a--another--nearly 20-year-old Spectral DMA-90 would seem to be unfounded, which is terrific news!