Dead PET4032

dwight dkelvey at
Mon Oct 5 15:55:50 CDT 2015

One chip getting hot does bother me.
Have you measured the voltage rails.
If the voltage is gone, it may be shorted.
Just swapping it out may not be a good idea unless
you know that it wasn't a failed regulator that
caused it to short out.
Some of the TO-3 type regulators depend on the
screws connecting the case to ground.
I have seen case that corrosion caused by dissimilar metals has caused
the case to float, causing over voltage and damage to the circuit.
I don't know that that is the case of a PET ( don't know
what they use for regulators ).
Voltage checks are always a first.


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