I'm recapping a 200s and I've noticed that this chassis has solid state rectifiers instead of the usual GZ34. There is no socket or hole in chassis for the GZ34 so I'm assuming it came from the factory this way?? When did Sunn switch to diode vs tube rectification? I'm going to replace the multi-section cap with a very close replacement. This will require a 40 uF cap in the pie filter instead of the 20 uF capacitor that's there now. (I've noticed that the schematic calls out a 30 uF cap). Obviously someone's done this before with this chassis but the mods look very OEM with all capacitors held by clamps riveted to the chassis, wiring looks orginal as well.