Phase linear 8000 power supply

Ol'Junker

Ol'Junker

New Around These Parts
Joined
May 5, 2025
Messages
2
Location
Hesperia, CA.
Tagline
If it don't fit, make it fit
As a new member to this Audio community, I would like to thank everyone for all the great information that is available on this Forum. I would like to share a issue that is not really a problem because I think I have fixed it. My Phase linear 8000 turntable had the classic problems that seem to occur after time. Tone arm not lifting up or down, not stopping on the record starting point and not retuning at the end of the record. I came across on two beat up Pioneer Pl-1000 that still worked. I used them to to learn how everything worked. Not concerned if I mess something up. After changing out what the service manual said could be the problem and comparing each component. I replaced all the out of value caps and stock RCA cables with jacks to use my Kimber cables. New belt for tone arm motor. The only thing that worked for my PL turntable was when I plugged into my Variac on 116 volts. This came to me when I took a reading on the power supply feed. Schematic shows 24 volts and I was getting 26.8 volts. When I plugged into 120 ( I have a dedicated circuit to my listening room) all the automatic functions did not work. I then plugged into the 116 volts and everything work fine. I took voltage measurements on the other two Pioneer PL1000 and they seem to be around the same 26 plus volts. I'm sure there is more to it then my fix, but for know I'm enjoying Metallica sad but true.
 
Welcome aboard.
And yup we all like to tinker .
I have a cousin that lives in your town.
Visited there a few years ago .
 
Thanks for all the positive feedback. I knew I had to eventually take my PL8000 apart and fix it. I suspected the power supply and sure enough the Zener diode D103 was the problem. I changed it out and replaced the capacitors. Voltage now a steady 25.3 volts. Put it all back together and cross my fingers that it would not act squirrelly. Plugged it in and everything work as it should. No more Variac to plug into. I read that some PL8000 owners have problems with tone arm not stopping at the correct starting point of the record and moves all the way to the of record and then returns. Maybe they could try my fix.
 
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