Phase Linear 700B Heavy Modifications

[les4lb]

Hello all

I posted about my Phase Linear 700B about a year about. I finally got the heart to see if it works. I tested the DC offset and it was 0.03, so I added speakers and it sounds great. I want to add new meters but since I have limited experience here, I would like some other eyes on this amp. It appears to have been modified a lot. Is that board from White Oak? Also, it has 6 fuses in the front and 4 in the back, I am wondering if that is in place of a relay protection?
There is also a Potter & Brumsfield microswitch as part of the power switch.
It appears the Backplate is still original.

My plan was to do a full White Oak upgrade but I am not sure if that is still needed? I have added photos for your thoughts. Thank you

 

[mr_rye89]

looks like a bodge job "pro" amp conversion. Fuses and nanner jacks up front for use in a rack in a PA system. looks like the extra fuses are in series with the negative speaker terminals and the Zobel networks are there on the front nanner jacks too. Other than the roadie mods the amps look stock and has no WO parts.....

 

[Hexis22]

Those amps are definitely modded, but not in a good way…

Good candidates for a full White Oak upgrade, including new faceplate and chassis.