I've tried a lot of different op-amps in the 300 and nothing worked but the 351's so I could be all f*&^^/##! Up on the 36 board recommendation . Gadget...pop some in there and scope it. Let us know what ya find, there is no reason to doubt Prezm's findings as he has fixed a lot of his own PL stuff. All the PL 36 boards that have come through here get pulled...
Przem, if you don't have a scope i don't recommend it.....and this was straight from ED.