The little drive input filter boards?
On Sun, Oct 26, 2025, 12:21 PM <tentec-request@contesting.com> wrote:
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> Today's Topics:
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> 1. Centaur amp (phil greene)
> 2. Re: Centaur amp (Paul Kraemer)
> 3. Re: Centaur amp (Ken Brown)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Sat, 25 Oct 2025 23:02:26 -0400
> From: phil greene <trapperpg@gmail.com>
> To: tentec@contesting.com
> Subject: [TenTec] Centaur amp
> Message-ID: <31BFC9E1-8BE0-485D-A7ED-D6111DBA8358@gmail.com>
> Content-Type: text/plain; charset=us-ascii
>
> New to me Centaur amp with 572 tubes of unknown health.
> Only has output on 80 meters (~500w)
> 10-40 meters have plate and grid current but no output
> Load capacitor has no effect on any band
> Tuning cap will dip grid current
> Tried dummy load with same result
> All resistors check good, and have cleaned band switch and it did not
> appear cracked nor damaged.
> Ideas on where to start troubleshooting?
> N4ZSA
>
>
> Sent from my iPhone
>
>
> ------------------------------
>
> Message: 2
> Date: Sat, 25 Oct 2025 22:07:22 -0500
> From: Paul Kraemer <elespe@lisco.com>
> To: tentec@contesting.com
> Subject: Re: [TenTec] Centaur amp
> Message-ID: <af20ace8-cd46-4020-a677-250c72aec44e@lisco.com>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> Make sure your driver is putting power on the band in question. Happened
> to me once.? Never assume it is.
>
> Paul K0UYA
>
> On 10/25/2025 10:02 PM, phil greene wrote:
> > New to me Centaur amp with 572 tubes of unknown health.
> > Only has output on 80 meters (~500w)
> > 10-40 meters have plate and grid current but no output
> > Load capacitor has no effect on any band
> > Tuning cap will dip grid current
> > Tried dummy load with same result
> > All resistors check good, and have cleaned band switch and it did not
> appear cracked nor damaged.
> > Ideas on where to start troubleshooting?
> > N4ZSA
> >
> >
> > Sent from my iPhone
> > _______________________________________________
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> ------------------------------
>
> Message: 3
> Date: Sat, 25 Oct 2025 20:57:39 -1000
> From: Ken Brown <kenradiobrown@gmail.com>
> To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
> Subject: Re: [TenTec] Centaur amp
> Message-ID:
> <CAGnjFf=
> JFkDWN1wiCzMmB0+q1m2LJ5hsKj5gR4ttuf6StpDOFA@mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> Sounds to me like there is a broken connection in the tank circuit. My
> guess is that the part of the band switch that connects additional fixed
> value capacitors to the Tune and Load variable capacitors is working, but
> the connection to the variable Load capacitor and the part of the switch
> that shorts out unused turns of the inductor is open circuit somewhere.
> Come to think of it, maybe just an open circuit to the loading capacitor
> would be enough to cause these symptoms, since there may be no fixed
> capacitors added to the loading on any bands besides 80 meters. I would
> focus on the connections to the Loading capacitor.
>
> DE N6KB
>
> On Sat, Oct 25, 2025 at 5:11?PM phil greene <trapperpg@gmail.com> wrote:
>
> > New to me Centaur amp with 572 tubes of unknown health.
> > Only has output on 80 meters (~500w)
> > 10-40 meters have plate and grid current but no output
> > Load capacitor has no effect on any band
> > Tuning cap will dip grid current
> > Tried dummy load with same result
> > All resistors check good, and have cleaned band switch and it did not
> > appear cracked nor damaged.
> > Ideas on where to start troubleshooting?
> > N4ZSA
> >
> >
> > Sent from my iPhone
> > _______________________________________________
> > TenTec mailing list
> > TenTec@contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
> >
>
>
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> ------------------------------
>
> End of TenTec Digest, Vol 271, Issue 2
> **************************************
>
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