[TenTec] 422 Centurion blowing fuses...

[Rodney]

one of the tubes may be shorted take them out and check the pins for shorts 
73 Rod

-----Original Message----- 
From: Bry Carling
Sent: Thursday, January 30, 2014 3:30 PM
To: tentec at contesting.com
Subject: [TenTec] 422 Centurion blowing fuses...

I have a Tentec 422 Centurion that is blowing the main 20 Amp fuses...

Looking for insights to this amp failure.  It started spontaneously.
I can turn on the main power OK and the filaments light up on the
3-500Zs.  The 12 volt power supply is OK because the pilot lights come on.
However when I flip the standby - operate switch to the Operate positionm
the fuse or fuses will blow.  I replaced them with good 250V 20A cuses.

I checked the plate transformer windings and everything seems normal for
all three windings. Nothing is shorted. The safety ground for the cover-open 
condition is not
across the HV plate supply. I checked that nothing else is shorting out the 
plate supply
either.

Does anyone have any idea what might be going on here?

Many thanks - Brian Carling, AF4K



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