[Amps] zener question

[Roy Koeppe]

Ken asked,

"Fifteen diodes marked "PTC 2050" I have been unable to find any
reference
to these. I removed one and tested it like
a zener, and never detected a breakdown voltage up to 35v, that's where
I
stopped. Might someone recognize...(etc.)"


Not to insult you, but most power diodes are pretty much the same kind
for this application (cathode bias in a GG amp).
You must use the opposite polarity that you use for testing zeners. Plus
to the arrow head. Forward drop should be on order 0.8 volts per diode.

73,   Roy    K6XK