[TenTec] Model 411 amp (aka Centaur)

[Carl Moreschi]

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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