Thanks again gents for making this an illuminating thread.
The mac I was looking at sold while I hesitated, so I ended up getting a McIntosh MC 2120 for the same price. The Bryston was a much further drive. An old Crown DC300 also popped up for sale locally (I'd heard good things about it and NS10s elsewhere--i recall reading that Chris Stamey liked them because he found the of sluggish slew rate help tame the speakers edginess). however, i figured the dc300 would require re-capping (+$$$).
I'm extremely happy with the way this amp sounds. It doesn't have the glass front panel, cool blue VU meters and Tron-eque light show the 2505 had, but it's about a decade younger.
MC 2120
ELECTRICAL: 120w/ch. (240w mono). Response 20-20kHz (+0 -0.25dB). Distortion 0.1%. Noise and hum -95dB. Output impedance 2, 4, 8 and 16 ohms. (1, 2, 4 and 8 ohms in mono). Damping factor 14 or greater. Input impedance 100k. Input sensitivity 0.75v or 2.5v. Headphone impedance: low. Sentry Monitor. Power Guard.
FRONT PANEL: Anodized gold and black panel. Gain controls. Output mode lamps: normal or limit. Power sw: on or off. Headphone jack.
BACK PANEL: Output barrier strips. Audio inputs. AC outlet. Input level sw: 2.5v or .75v. Mode sw: stereo or mono. Power Guard sw: normal or out. Fuse.
Size 5-7/16"H, 16"W and 14-1/2"D. Weight 65 lb. Sold from 1976-1982. Last retail price $999.00