[TenTec] Centurion 422 Fuses blowing

Bry Carling bcarling at cfl.rr.com
Thu Jan 30 22:55:26 EST 2014


Thanks so much for the advice, everyone...

As it turns out, the power transformer is shot.

It spontaneously died for no apparent reason. Tubes are not shorted, and the rectifoers amd 
caps are intact. One of the two primary windings has shorted out completely. The other is 
OK.

Anyone have a hypersil transformer they would like to sell?

73 - Bry Carling AF4K

On 30 Jan 2014 at 8:35, Bry Carling wrote:

> I havea nice Tentec Centurion 422 and the main 20A fuses blowing.
> 
> 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-ofrf 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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