Just joined site. heard this is the site for people who are into Phase Linear equipment. Just pick-up two 700b units and going to repair and refurbish them, may need some help on this because I am just a hobbyist when it comes to electronics.
You are in the right place. You can upgrade your PL700B amplifiers from mild (reliable) to wild (more power, better stereo separation, lower distortion).
And, your amplifiers don't exist unless we see pictures of them...