I did that to my centaur. Unlike the Ameritrons the TenTec power supply will
crank out more pwr with 572
George,w6GF
Sent from my iPhone
> On Feb 4, 2016, at 2:55 PM, Joe Papworth via TenTec <tentec@contesting.com>
> wrote:
>
> Yep, finding good tubes has been very frustrating. I just sent the new 811A's
> with the prematurely sagged plates back to DX Engineering.
> I have two, working, 40-plus-year-old Cetron 572B's that I pulled out of my
> SB-200 some years ago. My next (and probably last) try is those two tubes
> with a new Cinese 572B. It's an iffy proposition at best, but I'm tired of
> throwing money at the amp.
>
>
> Sent from AOL Mobile Mail
>
>
> -----Original Message-----
> From: rick@dj0ip.de <Rick@DJ0IP.de>
> To: 'Discussion of Ten-Tec Equipment' <tentec@contesting.com>
> Sent: Thu, Feb 4, 2016 02:03 PM
> Subject: Re: [TenTec] Model 411 amp (aka Centaur)
>
>
> Al,
>
> Unfortunately 2016 is not 1999.
> It's tough to find good tubes anymore.
>
> A few years ago, RF-Parts stopped the sales of 572B entirely until they
> could work with their Chinese supplier and get the quality up to snuff.
> They refused to sell an inferior product.
>
> On their web site, RF-Parts writes "The Taylor Select 811A is the best
> quality tube in current production." Obviously they mean best quality 811A.
> The cost of a matched set of 3 is currently $95.85.
>
> 572B's are scarce. They are available in very limited quantities with a
> matched set of 3 costing $239.85. More than twice the price of 811A.
>
> It seems there is a waiting list.
> See: <a href="https://www.rfparts.com/572b-tubes";
> target="_blank">https://www.rfparts.com/572b-tubes</a>
>
> 73 - Rick, DJ0IP
> (Nr. Frankfurt, Germany)
>
>
>
> -----Original Message-----
> From: TenTec [<a
> href="mailto:tentec-bounces@contesting.com?";>mailto:tentec-bounces@contesting.com</a>]
> On Behalf Of Al Sirois
> Sent: Thursday, February 04, 2016 6:53 PM
> To: <a href="mailto:km2km@twc.com";>km2km@twc.com</a>; <a
> href="mailto:tentec@contesting.com";>tentec@contesting.com</a>
> Cc: Ron Sirois; <a href="mailto:k8mp@aol.com";>k8mp@aol.com</a>
> Subject: Re: [TenTec] Model 411 amp (aka Centaur)
>
> 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.
>
> <a href="mailto:N1MHC@arrl.net";>N1MHC@arrl.net</a>
> Al Sirois
> East Boothbay, ME 04544-0002
> ==========================
>
> -----Original Message-----
> From: Joe Papworth via TenTec
> Sent: Thursday, January 28, 2016 9:54 AM
> To: <a href="mailto:km2km@twc.com";>km2km@twc.com</a> ; <a
> href="mailto:tentec@contesting.com";>tentec@contesting.com</a>
> Cc: <a href="mailto:k8mp@aol.com";>k8mp@aol.com</a>
> 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 <<a href="mailto:km2km@twc.com";>km2km@twc.com</a>>
> To: Discussion of Ten-Tec Equipment <<a
> href="mailto:tentec@contesting.com";>tentec@contesting.com</a>>
> Cc: k8mp <<a href="mailto:k8mp@aol.com";>k8mp@aol.com</a>>
> 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 <<a
> href="mailto:tentec@contesting.com";>tentec@contesting.com</a>> 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 <<a href="mailto:km2km@twc.com";>km2km@twc.com</a>>
> To: Discussion of Ten-Tec Equipment <<a
> href="mailto:tentec@contesting.com";>tentec@contesting.com</a>>
> 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='<a href="mailto:tentec@contesting.com";>tentec@contesting.com</a>?'<a
> href="mailto:tentec@contesting.com";
> >tentec@contest?'="">mailto:tentec@contesting.com'>tentec@contest</a>
> ing.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='<a href="mailto:n4py3@earthlink.net";>n4py3@earthlink.net</a>?'<a
> href="mailto:n4py3@earthlink.net";
> >n4py3@earthlink.ne?'="">mailto:n4py3@earthlink.net'>n4py3@earthlink.ne</a>
> t>
> To: wb5jnc <<a
> href='<a href="mailto:wb5jnc@centurytel.net";>wb5jnc@centurytel.net</a>?'<a
> href="mailto:wb5jnc@centurytel.net";
> >wb5jnc@century?'="">mailto:wb5jnc@centurytel.net'>wb5jnc@century</a>
> tel.net>;
> Discussion of Ten-Tec Equipment <<a
> href='<a href="mailto:tentec@contesting.com";>tentec@contesting.com</a>?'<a
> href="mailto:tentec@contesting.com";
> >tentec@contest?'="">mailto:tentec@contesting.com'>tentec@contest</a>
> ing.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: <a href="http://www.n4py.com";
> target="_blank">www.n4py.com</a>" target="_blank"><a
> href="http://www.n4py.com"; target="_blank">www.n4py.com</a>
>
> 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='<a href="mailto:xtraham58@hotmail.com";>xtraham58@hotmail.com</a>?'<a
> href="mailto:xtraham58@hotmail.com";
> >xtraham58@hotm?'="">mailto:xtraham58@hotmail.com'>xtraham58@hotm</a>
> ail.com>
>
> >> To: Discussion of Ten-Tec Equipment<<a
> href='<a href="mailto:tentec@contesting.com";>tentec@contesting.com</a>?'<a
> href="mailto:tentec@contesting.com";
> >tentec@contest?'="">mailto:tentec@contesting.com'>tentec@contest</a>
> ing.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
> >>
> >> _______________________________________________
> >> TenTec mailing list
> >> <a
> href='<a href="mailto:TenTec@contesting.com";>TenTec@contesting.com</a>?'<a
> href="mailto:tentec@contesting.com";
> >tentec@contest?'="">mailto:tentec@contesting.com'>TenTec@contest</a>
> ing.com
> >> <a href="http: lists.contesting.com="" mailman="" listinfo=""
> tentec"
> target="_blank"><a
> href="http://lists.contesting.com/mailman/listinfo/tentec";
> target="_blank">http://lists.contesting.com/mailman/listinfo/tentec</a>
> >>
> >> _______________________________________________
> >> TenTec mailing list
> >> <a
> href='<a href="mailto:TenTec@contesting.com";>TenTec@contesting.com</a>?'<a
> href="mailto:tentec@contesting.com";
> >tentec@contest?'="">mailto:tentec@contesting.com'>TenTec@contest</a>
> ing.com
> >> <a href="http: lists.contesting.com="" mailman="" listinfo=""
> tentec"
> target="_blank"><a
> href="http://lists.contesting.com/mailman/listinfo/tentec";
> target="_blank">http://lists.contesting.com/mailman/listinfo/tentec</a>
> >> _______________________________________________
> >> TenTec mailing list
> >> <a
> href='<a href="mailto:TenTec@contesting.com";>TenTec@contesting.com</a>?'<a
> href="mailto:tentec@contesting.com";
> >tentec@contest?'="">mailto:tentec@contesting.com'>TenTec@contest</a>
> ing.com
> >> <a href="http: lists.contesting.com="" mailman="" listinfo=""
> tentec"
> target="_blank"><a
> href="http://lists.contesting.com/mailman/listinfo/tentec";
> target="_blank">http://lists.contesting.com/mailman/listinfo/tentec</a>
> >>
> >>
> >>
> >>
> >>
> >>
> >> _______________________________________________
> >> TenTec mailing list
> >> <a
> href='<a href="mailto:TenTec@contesting.com";>TenTec@contesting.com</a>?'<a
> href="mailto:tentec@contesting.com";
> >tentec@contest?'="">mailto:tentec@contesting.com'>TenTec@contest</a>
> ing.com
> >> <a href="http: lists.contesting.com="" mailman="" listinfo=""
> tentec"
> target="_blank"><a
> href="http://lists.contesting.com/mailman/listinfo/tentec";
> target="_blank">http://lists.contesting.com/mailman/listinfo/tentec</a>
> > _______________________________________________
> > TenTec mailing list
> > <a
> href='<a href="mailto:TenTec@contesting.com";>TenTec@contesting.com</a>?'<a
> href="mailto:tentec@contesting.com";
> >tentec@contest?'="">mailto:tentec@contesting.com'>TenTec@contest</a>
> ing.com
> > <a href="http: lists.contesting.com="" mailman="" listinfo=""
> tentec"
> target="_blank"><a
> href="http://lists.contesting.com/mailman/listinfo/tentec";
> target="_blank">http://lists.contesting.com/mailman/listinfo/tentec</a>
> >
> _______________________________________________
> TenTec mailing list
> <a
> href='<a href="mailto:TenTec@contesting.com";>TenTec@contesting.com</a>?'<a
> href="mailto:tentec@contesting.com";
> >tentec@contest?'="">mailto:tentec@contesting.com'>TenTec@contest</a>
> ing.com
> <a href="http: lists.contesting.com="" mailman="" listinfo="" tentec"
> target="_blank"><a
> href="http://lists.contesting.com/mailman/listinfo/tentec";
> target="_blank">http://lists.contesting.com/mailman/listinfo/tentec</a>
>
>
>
>
> _______________________________________________
> TenTec mailing list
> <a
> href='<a href="mailto:TenTec@contesting.com";>TenTec@contesting.com</a>?'<a
> href="mailto:tentec@contesting.com";
> >tentec@contest?'="">mailto:tentec@contesting.com'>TenTec@contest</a>
> ing.com
> <a href="http: lists.contesting.com="" mailman="" listinfo="" tentec"
> target="_blank"><a
> href="http://lists.contesting.com/mailman/listinfo/tentec";
> target="_blank">http://lists.contesting.com/mailman/listinfo/tentec</a>
> _______________________________________________
> TenTec mailing list
> <a
> href='<a href="mailto:TenTec@contesting.com";>TenTec@contesting.com</a>?'<a
> href="mailto:tentec@contesting.com";
> >tentec@contest?'="">mailto:tentec@contesting.com'>TenTec@contest</a>
> ing.com
> <a href="http: lists.contesting.com="" mailman="" listinfo="" tentec"
> target="_blank"><a
> href="http://lists.contesting.com/mailman/listinfo/tentec";
> target="_blank">http://lists.contesting.com/mailman/listinfo/tentec</a>
> </a href="http:></a href='<a href="mailto:tentec@contesting.com";
> ><="" a?'="">mailto:tentec@contesting.com'></a</a>
> href="http:></a
> href='<a href="mailto:tentec@contesting.com"; ><=""
> a?'="">mailto:tentec@contesting.com'></a</a> href="http:></a
> href='<a href="mailto:tentec@contesting.com"; ><=""
> a?'="">mailto:tentec@contesting.com'></a</a>
> href="http:></a href='<a href="mailto:tentec@contesting.com"; ><=""
> a?'="">mailto:tentec@contesting.com'></a</a>
> href="http:></a
> href='<a href="mailto:tentec@contesting.com"; ><=""
> a?'="">mailto:tentec@contesting.com'></a</a> href="http:></a
> href='<a href="mailto:tentec@contesting.com"; ><=""
> a?'="">mailto:tentec@contesting.com'></a</a>
> href="http:></a href='<a href="mailto:tentec@contesting.com"; ><=""
> a?'="">mailto:tentec@contesting.com'></a</a>
> href="http:></a
> href='<a href="mailto:tentec@contesting.com"; ><=""
> a?'="">mailto:tentec@contesting.com'></a</a>
> href='<a href="mailto:tentec@contesting.com"; ><=""
> a?'="">mailto:tentec@contesting.com'></a</a>
> href='<a href="mailto:xtraham58@hotmail.com"; ><=""
> a?'="">mailto:xtraham58@hotmail.com'></a</a> href="http:></a
> href='<a href="mailto:tentec@contesting.com"; ><=""
> a?'="">mailto:tentec@contesting.com'></a</a>
> href='<a href="mailto:wb5jnc@centurytel.net"; ><=""
> a?'="">mailto:wb5jnc@centurytel.net'></a</a>
> href='<a href="mailto:n4py3@earthlink.net"; ><=""
> a?'="">mailto:n4py3@earthlink.net'></a</a>
> href='<a href="mailto:tentec@contesting.com";
> >?'="">mailto:tentec@contesting.com'></a>;
> _______________________________________________
> TenTec mailing list
> <a href="mailto:TenTec@contesting.com";>TenTec@contesting.com</a>
> <a href="http://lists.contesting.com/mailman/listinfo/tentec";
> target="_blank">http://lists.contesting.com/mailman/listinfo/tentec</a>
>
>
>
>
> _______________________________________________
> TenTec mailing list
> <a href="mailto:TenTec@contesting.com";>TenTec@contesting.com</a>
> <a href="http://lists.contesting.com/mailman/listinfo/tentec";
> target="_blank">http://lists.contesting.com/mailman/listinfo/tentec</a>
>
> _______________________________________________
> TenTec mailing list
> <a href="mailto:TenTec@contesting.com";>TenTec@contesting.com</a>
> <a href="http://lists.contesting.com/mailman/listinfo/tentec";
> target="_blank">http://lists.contesting.com/mailman/listinfo/tentec</a>
>
> _______________________________________________
> TenTec mailing list
> <a href="mailto:TenTec@contesting.com";>TenTec@contesting.com</a>
> <a href="http://lists.contesting.com/mailman/listinfo/tentec";
> target="_blank">http://lists.contesting.com/mailman/listinfo/tentec</a>
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|