There was no PAS-4. There was a PAS-3 (tube) and a PAT-4 (transistor). May be that's why there's not much info out there on the PAS-4!
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Yes, it's from the Panor Dyna years, when Panor got control of the name. They were formerly Stereo Cost Cutters. Good build quality and nice sound as you point out.
Panor made a few tube amps as well. The Dyna ST70 MKii was a bit of a turkey, IMHO. Primarily because they used the input filters that were forwarded by Frank Van Alstine and they choked the amp at the input. They made a mono, M60 that was quite nice and some solid state amps and preamps as well.