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Re: [TenTec] Model 411 amp (aka Centaur)

To: k8mp@aol.com, tentec@contesting.com
Subject: Re: [TenTec] Model 411 amp (aka Centaur)
From: Al Gulseth <wb5jnc@centurytel.net>
Reply-to: wb5jnc@centurytel.net, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Tue, 26 Jan 2016 17:34:42 -0600
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
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 &lt;n4py3@earthlink.net&gt;
> To: wb5jnc &lt;wb5jnc@centurytel.net&gt;; Discussion of Ten-Tec Equipment
> &lt;tentec@contesting.com&gt; 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:
> &gt; Joe,
> &gt;
> &gt; Just an ohms check may not be enough. You may be dealing with an
> intermittent &gt; breakdown under high voltage. A "hi-pot" (high potential)
> test with an &gt; insulation tester etc. would be the only way to know for
> sure. A winding &gt; layer to adjacent layer partial short in the HV side
> could also account for &gt; your symptoms, and might not be obvious because
> the winding resistance could &gt; show right at the low edge of the
> manufacturer's spec. (I went through that &gt; scenario years ago with a HV
> filter choke in a small AM BC transmitter.) &gt;
> &gt; 73 es GL, Al
> &gt;
> &gt; On Tue January 26 2016 11:28:03 am Joe Papworth via TenTec wrote:
> &gt;&gt;     Thanks Andy. Was it the HV secondary that shorted?
> &gt;&gt;
> &gt;&gt;
> &gt;&gt;    I isolated the HV secondary from the HV board and it reads open
> to the &gt;&gt; frame and chassis. (Reads about 45 ohms when connected to
> the board) &gt;&gt;
> &gt;&gt;
> &gt;&gt;    Thanks, Joe, K8MP
> &gt;&gt;
> &gt;&gt;
> &gt;&gt;   -----Original Message-----
> &gt;&gt;   From: P C Andy Anderson&lt;xtraham58@hotmail.com&gt;
> &gt;&gt;   To: Discussion of Ten-Tec Equipment&lt;tentec@contesting.com&gt;
> &gt;&gt;   Sent: Tue, Jan 26, 2016 11:52 am
> &gt;&gt;   Subject: Re: [TenTec] Model 411 amp (aka Centaur)
> &gt;&gt;
> &gt;&gt;
> &gt;&gt;
> &gt;&gt;
> &gt;&gt;   Joe, I had a similar problem with my Centurion AMP.  It
> eventually failed &gt;&gt;   completely. The secondary of the power
> transformer shorted to the frame. I &gt;&gt; had the Xformer rewound at
> TRS.  BTW this transformer problem is a known. &gt;&gt;
> &gt;&gt;   73' Andy, W3LI
> &gt;&gt;
> &gt;&gt;   ________________________________________
> &gt;&gt;
> &gt;&gt;
> &gt;&gt;   Tuesday noontime, Joe:
> &gt;&gt;
> &gt;&gt;   I have a Centaur..............keep it covered when not in use.
> &gt;&gt;
> &gt;&gt;   My Elmer told me to always keep it covered..................dust
> is the &gt;&gt;   problem.
> &gt;&gt;
> &gt;&gt;   Even when covered, open it up every two-three years and do a
> internal &gt;&gt;   cleaning.
> &gt;&gt;
> &gt;&gt;   N1MHC/alsirois
> &gt;&gt;   =============
> &gt;&gt;
> &gt;&gt;
> &gt;&gt;
> &gt;&gt;   Gents,
> &gt;&gt;
> &gt;&gt;
> &gt;&gt;   Have any of you gone a few rounds with a Centaur amp?
> &gt;&gt;   I have a one that blows fuses very intermittently. It vaporizes
> them both, &gt;&gt;   simultaneously, so it's apparently a dead-short
> somewhere. This happens &gt;&gt; even in stand-by. (i.e. No key-down)
> &gt;&gt;
> &gt;&gt;
> &gt;&gt;   Before I tear into it, anyone have any ideas of common failures
> in these &gt;&gt;   amps?
> &gt;&gt;
> &gt;&gt;
> &gt;&gt;   Later, Joe, K8MP
> &gt;&gt;
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> &gt;&gt;
> &gt;&gt;
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