The filaments, bias, control voltage and HV comes up when the power switch
is ON. The Standby-Operate switch controls the QSK board and standby bias
control.
73
Bob, K4TAX
----- Original Message -----
From: "Clayton Brantley" <clayton_n4ev@yahoo.com>
To: "Brian Carling AF4K" <bcarling@cfl.rr.com>; "Discussion of Ten-Tec
Equipment" <tentec@contesting.com>
Sent: Thursday, January 30, 2014 5:08 PM
Subject: Re: [TenTec] 422 Centurion blowing fuses...
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@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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