Heathkit AA1800 amplifier

Does anyone know of or have any input on the big Heathkit amp from the 80's the AA1800 any info or feedback would be great thanks.
This is one nice amplifier when working properly! 250wpc but some say it can do 350+ fairly easy. I have the entire Heathkit Pro series stack, and the aa1800 gets used the most. While I have other amps I use more, I really enjoy the aa1800 on my Speakerlab Super 7s and Dalhquist DQ-10s

If you own (or plan to own) speakers that love power, this amp is a real keeper. It will perform as well, if not better, than power amps that sell for 2-10x as much