Per Carl - note the word "intermittent." That would account for the seeming
randomness of the blown fuses. I think dealing with that word in relation to
electronic devices may also have something to do with my lack of hair :-(
73, Al
On Tue January 26 2016 3:19:18 pm k8mp@aol.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 <n4py3@earthlink.net>
> To: wb5jnc <wb5jnc@centurytel.net>; Discussion of Ten-Tec Equipment
> <tentec@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
> 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<xtraham58@hotmail.com>
> >> To: Discussion of Ten-Tec Equipment<tentec@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
> >>
> >> _______________________________________________
> >> 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
> >> _______________________________________________
> >> 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
> > _______________________________________________
> > 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
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|