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Answers:
1. Nakamichi PA-302
Manufactured in 1989
2. Rockford Fosgate Power 1000
3. Marantz 750A
It has a feature called frequency and level enlarger.
4. McIntosh MC431
Sold from 1994-1997
5. US Amps Double D
Power ratings at 13.8V:
1 x 2700 @ 2 ohms
1 x 4200 @ 1 ohm
1 x 6000 @ ¾ ohm
1 x 7200 @ ½ ohm
6. Phoenix Gold M50
Manufactured in 1992-1995
7. Nakamichi 1000pa
8. Zed Audio Draconia
9. Precision Power PC6600.2
Manufactured in 2000
10. Orion HCCA275R
11. Soundstream MC300
Around 1988
12. Soundstream Human Reign 4
13. Hafler MSE88tn
Class A (actual power is more than twice as rated)
Double-fused speaker outputs
MOSFET output, not just MOSFET power supply
14. a/d/s/ PQ20
15. Alphasonik A-265
Manufactured in 1984
16. Audison HV Venti
Manufactured in 2004
Dual mono amplifier, dual BIAS, configurable A class percentage
17. Carver M4120
18. Linear Power 2002