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
>>
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