I would pull the plate caps off first and see if ur still blowing fuses.Andy
Talk is cheap, Action counts!
>
> one of the tubes may be shorted take them out and check the pins for shorts
> 73 Rod
>
>
>
> 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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