[TenTec] 422 Centurion blowing fuses...

[Clayton Brantley]

I'd check the HV power supply diodes.  Bet one or more is shorted.

Clayton N4EV





On Thursday, January 30, 2014 5:41 PM, Bry Carling <bcarling at cfl.rr.com> wrote:
 
Thanks Rod and PC. I already tried disconnecting the plate transformer secondary and it still 
blew fuses. I think I have a bad transformer. I will check it further but looks like a serious 
expense to buy a replacement Hypersil transformer from Tentec. I will check everythkngelse 
first but this doesn't look good.

73 Bry AF4K

On 30 Jan 2014 at 16:48, PC Anderson wrote:

> 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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> > 
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