Hi Guys,
I have a Centurion that experienced some kind of arcing event which resulted in
one of the traces on the Filter/Rectifier board that connects to the secondary
of the transformer to actually vaporize. I bridged the trace, replaced the
capacitors and checked the diodes. After repairing / rebuilding the board, I
reinstalled it and now have normal B plus. HOWEVER, I have 200 mA of standby
plate current. This suggests the bias transistor is blown and I have had this
problem in the past. Unfortunately, I replaced the bias transistor and still
have 200 mA of standby plate current. My question is: Do any of you have an
any idea of what to check besides the bias transistor. Or, is there some
common cause for the transistor to fail? I bought 5 of them from Mouser and
hesitate to keep replacing them until I know what is causing the failure. The
transistors I bought are IDENTICAL to the transistor I bought from Ten Tec the
last time it failed.
thanks
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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