[TenTec] Model 411 amp (aka Centaur)

[Al Gulseth]

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 at 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 at earthlink.net>
> To: wb5jnc <wb5jnc at centurytel.net>; Discussion of Ten-Tec Equipment
> <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
> 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 at hotmail.com>
> >>   To: Discussion of Ten-Tec Equipment<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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