Had a couple of them myself. Two were 100-125 wpc and two were 250 wpc. Bought them from a disco that was liquadating back around 1986. Also got a SA crossover and eq as well as a Showco DJ mixing console. Wish I still had the Showco board just as a collectors piece.

Read a little about Spectro Acoustics. The core of that company came from the original Phase Linear factory. As I recall, one of the key founders was the brains behind EV Tapco and also Mackie.

The Spectro Acoustic amps were good amps - sounded great.

I see SA gear on eBay every now and then. For service maybe try: Circle Stereo