[TMC] Pal 500 parts

Larry lawrenceg94 at gmail.com
Sun Sep 11 12:46:12 EDT 2016


My PAL-500 quit working some time ago and i finally got it on the bench 
to see what i could do for it's poor soul.  Plate voltage read 3KV 
instead of 2KV and virtually no screen current.

So far i've found that the zener regulator in the PSP500 had the wire 
coming off of it had never been soldered, just wrapped around the 
termination.  Why i've never seen that before is beyond me other than 
maybe i did see it and said to myself i'll solder that connection when 
i'm done.  Procrastination is wonderful till it's time to pay the piper!

Then i find that the Bias adjust pot for one of the 4CX350A tubes has 
gone open.  took it apart and cleaned it but trying to fix it didn't 
work so now i'm looking for a 50K 2W (I guess it's 2W) pot as a 
replacement.

When i get these done then i'll look for more problems but so far every 
thing else looks ok.  Maybe i'll get lucky and will be able to get this 
thing up and running again.  It's a nice amp.

Any parts out there?

Larry
W0OGH




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