[TenTec] 422 Centurion blowing fuses...

[Robert Mcgraw]

For an amp that sells new today for over $3K, I'd say the $385 plus
shipping is a good deal.  I can't think of a company that would do it for
less.

I'd not think having an external transformer or HV supply, thus removing
the internal supply, would be a safe idea.  HV supplies of this magnitude
can be very dangerous.

73
Bob, K4TAX






> Thanks so much Bob... The choices are rough - $500 plus shipping for a
> new transformer
> from Tentec or $385 plus shipping both ways for a rewind job!
>
> Yes, we get lightning, but this occurred when there was no lightning...
>
> Any thoughts or ideas are appreciated. I may have to go with an external
> power supply...
>
> Brian AF4K
>
>
> On 30 Jan 2014 at 22:05, Bob McGraw - K4TAX wrote:
>
>> Sorry to learn of the bad news.
>>
>> There are companies around that can rewind/rebuild that transformer.
>> Certainly worth checking into as opposed to engineering some other
>> transformer in its place.
>> Per chance have you had a lightning strike lately?  That will do
>> it.
>>
>> 73
>> Bob, K4TAX
>>
>>
>>
>> ----- Original Message -----
>> From: "Bry Carling" <bcarling at cfl.rr.com>
>> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
>> Sent: Thursday, January 30, 2014 9:54 PM
>> Subject: Re: [TenTec] 422 Centurion blowing fuses...
>>
>>
>> > Thanks Bob, but the power transformer is shot.
>> >
>> > It spontaneously died for no apprent reason. Tubes are not
>> shorted, and
>> > the rectoifoers amd
>> > cap 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?
>> >
>> > Brian, AF4K
>> >
>> > On 30 Jan 2014 at 17:21, Bob McGraw - K4TAX wrote:
>> >
>> >> When the power switch is ON there is the HV also applied.  Thus
>> I
>> >> wouldn't
>> >> expect shorted tubes or any HV component.  Likely the bias
>> diode
>> >> shorted
>> >> thus when switched to Operate the tubes fully conduct and take
>> out
>> >> the fuse.
>> >> Watch for Plate current to peg.
>> >>
>> >> With amp ON and the Operate switch in Standby, you should be able
>> to
>> >> see the
>> >> HV on the meter.  The Operate switch basically changes the
>> control
>> >> mode,
>> >> thus the internal T/R switching is activated.
>> >>
>> >> 73
>> >> Bob, K4TAX
>> >>
>> >>
>> >> ----- Original Message -----
>> >> From: "Bry Carling" <bcarling at cfl.rr.com>
>> >> To: <tentec at contesting.com>
>> >> Sent: Thursday, January 30, 2014 2:30 PM
>> >> 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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>> >> > TenTec at contesting.com
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>> >> >
>> >>
>> >>
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>> >
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>>
>>
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-- 
Disclosure:
I am a Tentec Ambassador and compensated according to the Tentec
Ambassador plan. I serve as a volunteer beta test person for the Omni
VII, Eagle and Argonaut VI products.   Otherwise, I hold no business or
employment interest with Tentec.