[TenTec] Model 411 amp (aka Centaur)

[Carl Moreschi]

The 57B's are superior to 811's.  When I had my Centaur, Paul Clinton at 
Tentec advised me to make the switch.  That worked out very well.

Carl Moreschi N4PY
58 Hogwood Rd
Louisburg, NC 27549
www.n4py.com

On 2/4/2016 12:52 PM, Al Sirois wrote:
> TUBES..........My T-T Manual says to use 811-A, not 572-B.....>
>
> I bought matched tubes from RF Parts in 1999 and they are still in the amp
>
> and working fine. I got 450 W out of them this morning on 80 meters.
>
> I do have spare 572-B's, but they are for my back-up amp a FL-2100-B.
>
> I've never swopped the tubes between the two amps..... I probably don't
> want to.
>
> Good Luck with you guys in this discussion group.
>
> N1MHC at arrl.net
> Al Sirois
> East Boothbay, ME 04544-0002
> ==========================
>
> -----Original Message----- From: Joe Papworth via TenTec
> Sent: Thursday, January 28, 2016 9:54 AM
> To: km2km at twc.com ; tentec at contesting.com
> Cc: k8mp at aol.com
> Subject: Re: [TenTec] Model 411 amp (aka Centaur)
>
> Thanks Kris,
> If I was desperate, I'd run it on two tubes.?
> BTW- I haven't bit the bullet on a new tubes yet cuz from what I read on
> the net, the ones on the market now just plain suck.
>
>
> Seeeeeeeeeeeeya, Joe
>
>
> -----Original Message-----
> From: km2km <km2km at twc.com>
> To: Discussion of Ten-Tec Equipment <tentec at contesting.com>
> Cc: k8mp <k8mp at aol.com>
> Sent: Thu, Jan 28, 2016 9:45 am
> Subject: Re: [TenTec] Model 411 amp (aka Centaur)
>
>
>
>
> Good morning Joe,
>
> Yes, my AMP does make a "thunk" when turned on, but, for example, I have
> been
> using it for an hour. Then I turned it off. Now, 15 minutes later, I
> turn it
> on and it does not "Thunk".
>
> I found that this AMP was built well, and the only issues for over 20
> years have
> been the tubes, and of of the toggle switches (IP/EP). The change to 10
> meters
> was a snap.
>
> Yes, it could have a quieter fan, but it is a good AMP and makes an S-unit
> difference.
>
> Good luck with the tubes. BTW I have used it with only two tubes, while
> waiting for a new set.
>
> Kris
>
> Kris KM2KM
> MERSCHROD
> 123 Warren Road
> Ithaca, NY 14850
>
> ---- Joe Papworth via TenTec <tentec at contesting.com> wrote:
>
> =============
> Hi Kris,
> Thanks for the info.
> It sounds like that store proprietor had gone a few rounds with some
> rigs. Hi hi
> I'll try the tubes by adding one at a time tomorrow.
> Say, does your Centaur make a loud in-rush clunk when you fire it up?
> And where did you buy your matched set?
>
> Later, Joe, K8MP
>
>
> Sent from AOL Mobile Mail
>
>
> -----Original Message----- From: km2km <km2km at twc.com>
> To: Discussion of Ten-Tec Equipment <tentec at contesting.com>
> Sent: Tue, Jan 26, 2016 06:28 PM
> Subject: Re: [TenTec] Model 411 amp (aka Centaur)
>
>
> I'm late chiming in. My problem with the fuses has always been a shorted
> tube.
> You are on the right track. Test one fuse at a time, or start with one, add
> another, then the third. BTW a matched set is better than an unmatched set
> HOWEVER, I had three misc tubes gathered over the years and put them in
> and do
> pretty well with them. I did that while waiting for a new matched set.
> Now the
> matched set is on the shelf waiting their turn!!!
>
> The guy at the local electronics store said to me one day when I bought
> a dozen
> fuses, "You do know that if you don't fix it then it will still blow
> fuses!"
>
> good luck,
>
> Kris
>
>
> Kris KM2KM
> MERSCHROD
> 123 Warren Road
> Ithaca, NY 14850
>
> ---- Joe Papworth via TenTec <<a
> href='tentec at contesting.com?'mailto:tentec at contesting.com'>tentec at contesting.com>
>
> wrote:
>
> =============
> It has stayed on with the tubes removed for a while.?
> I'm examining/ohming the tubes now.
>
>
> -----Original Message----- From: Carl Moreschi <<a
> href='n4py3 at earthlink.net?'mailto:n4py3 at earthlink.net'>n4py3 at earthlink.net>
>
> To: wb5jnc <<a
> href='wb5jnc at centurytel.net?'mailto:wb5jnc at centurytel.net'>wb5jnc at centurytel.net>;
>
> Discussion of Ten-Tec Equipment <<a
> href='tentec at contesting.com?'mailto:tentec at contesting.com'>tentec at contesting.com>
>
> Sent: Tue, Jan 26, 2016 3:03 pm
> Subject: Re: [TenTec] Model 411 amp (aka Centaur)
>
>
>
>
> Don't overlook the possibility on an intermittent short in one of the
> 811's.
>
> Carl Moreschi N4PY
> 58 Hogwood Rd
> Louisburg, NC 27549
> <a href="http: www.n4py.com" target="_blank">www.n4py.com
>
> On 1/26/2016 2:54 PM, Al Gulseth wrote:
> > Joe,
> >
> > Just an ohms check may not be enough. You may be dealing with an
> intermittent
> > breakdown under high voltage. A "hi-pot" (high potential) test with an
> > insulation tester etc. would be the only way to know for sure. A
> winding
> > layer to adjacent layer partial short in the HV side could also
> account for
> > your symptoms, and might not be obvious because the winding
> resistance could
> > show right at the low edge of the manufacturer's spec. (I went
> through that
> > scenario years ago with a HV filter choke in a small AM BC
> transmitter.)
> >
> > 73 es GL, Al
> >
> > On Tue January 26 2016 11:28:03 am Joe Papworth via TenTec wrote:
> >> Thanks Andy. Was it the HV secondary that shorted?
> >>
> >>
> >> I isolated the HV secondary from the HV board and it reads open
> to the
> >> frame and chassis. (Reads about 45 ohms when connected to the
> board)
> >>
> >>
> >> Thanks, Joe, K8MP
> >>
> >>
> >> -----Original Message-----
> >> From: P C Andy Anderson<<a
> href='xtraham58 at hotmail.com?'mailto:xtraham58 at hotmail.com'>xtraham58 at hotmail.com>
>
>
> >> To: Discussion of Ten-Tec Equipment<<a
> href='tentec at contesting.com?'mailto:tentec at contesting.com'>tentec at contesting.com>
>
>
> >> Sent: Tue, Jan 26, 2016 11:52 am
> >> Subject: Re: [TenTec] Model 411 amp (aka Centaur)
> >>
> >>
> >>
> >>
> >> Joe, I had a similar problem with my Centurion AMP. It
> eventually failed
> >> completely. The secondary of the power transformer shorted to
> the frame. I
> >> had the Xformer rewound at TRS. BTW this transformer problem is
> a known.
> >>
> >> 73' Andy, W3LI
> >>
> >> ________________________________________
> >>
> >>
> >> Tuesday noontime, Joe:
> >>
> >> I have a Centaur..............keep it covered when not in use.
> >>
> >> My Elmer told me to always keep it
> covered..................dust is the
> >> problem.
> >>
> >> Even when covered, open it up every two-three years and do a
> internal
> >> cleaning.
> >>
> >> N1MHC/alsirois
> >> =============
> >>
> >>
> >>
> >> Gents,
> >>
> >>
> >> Have any of you gone a few rounds with a Centaur amp?
> >> I have a one that blows fuses very intermittently. It vaporizes
> them both,
> >> simultaneously, so it's apparently a dead-short somewhere. This
> happens
> >> even in stand-by. (i.e. No key-down)
> >>
> >>
> >> Before I tear into it, anyone have any ideas of common failures
> in these
> >> amps?
> >>
> >>
> >> Later, Joe, K8MP
> >>
> >> _______________________________________________
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>
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