Phil,
What version of the PET 2001 do you have?  Is it a 2001-8 or a 
2001-16/32N or a 2001-32B? I forget from the beginning of this thread.

If you have a later 2001 model, I found this comment in some notes I 
have "..check the voltages from the anodes of the diodes CR10,11,12 
located alongside the heatsink.  VR6 regulator supplies the -5V to the 
dynamic RAMs.  It's not on a heatsink, and a convenient point of 
measuring this voltage is TP10.   .."


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