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Hi gals and guys, I'm a hobbyist in audio electronics for the past 15yrs, I have worked at a few Semiconductor wafer fabs for the past 44 years as a equipment technician working on plethora of different equipment over the years. I'm current retired from Semiconductor fab's but that may be...

Ok thanks, I was thinking with the very large capacitor upgrade it may be a issue.

Hi new member here, I have in front of me a PL400 not sure if its a series I or II, it has the analog meters, there is WOPL capacitor upgrade and rectifier and snubber PCB over the top of bridge rectifier, also has the speaker relay protection PCB. The driver and outputs appear original. My...