Guys,
I just posted a message about my Centurion with a bias problem. As I stated I
replaced the bias transistor which did not fix the problem. Here is something
interesting that I don’t understand. I bought 5 of them from Mouser. When I
measure the transistor junctions with my Fluke 87 meter in the diode function,
one junction seems normal as it measures .5 V in one direction and open in the
other. Normal, right? Now the other junction measures open in both directions.
It also measures open in ohmmeter mode. Could I have bought 5 bad
transistors? Is that even possible? What am I doing wrong in testing these
transistors? They are just an NPN bipolar transistor, right? FYI it is an
MJ15001G by ON. This is exactly what Ten Tec sent a few years ago when I had
to replace the transistor.
Very confused.
73
Mike WB0SND
Michael Marx
sndtubes@vacuumtubes.com
636-939-9190
SND Tube Sales
105 N. Division St.
Bonne Terre, MO 63628
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