All Phase Linear 700 series II amplifiers had PL-36 p.c. boards in them. If my memory serves me correct the Clair Brothers amps were all fully comp amps. Typically using NEC 2SD555's with 2SB600 output transistors. Later 700 series II's like the PRO 700's had the pro version PL-36 pc board with wider traces and the ceramic disc (slow down) capacitors already installed.
The amplifiers in the photos appear to be the transition into the PRO700's. The amp more than likely has press nuts with machine screws instead of sheet metal screws. The chassis may even be a steel chassis and not aluminum. I also see the larger 50 watt Dale resistors in the RC (Zoebel) network. This is because Clair Brothers drove the amp into clipping at 20KHz at 4 ohms. By the way, I have a spare supply of these Dale resistors available.
The Clair Brothers amps were spec'd to do 700 watts (single channel driven) into a 4 ohm load. Dean has a Clair Brother spec sheet that all the amps had to meet before they were shipped out. I will see if I can obtain a copy. NOTE: Clair Brothers later used the Dual 500's on the Pink Floyd "The Wall" tour.
Since these amps are coming from Hawaii, I would expect that they have a fair amount of rust due to their proximity to salt water.
Ed