[TenTec] Model 411 amp (aka Centaur)
k8mp at aol.com
k8mp at aol.com
Thu Jan 28 10:01:07 EST 2016
We knew what you meant Kris...
-----Original Message-----
From: km2km <km2km at twc.com>
To: Discussion of Ten-Tec Equipment <tentec at contesting.com>
Cc: Tony Lelieveld <va3dwi at gmail.com>
Sent: Thu, Jan 28, 2016 9:52 am
Subject: Re: [TenTec] Model 411 amp (aka Centaur)
Yes, sorry for the error. One tube at a time. (hand full of fuses :>)
Kris KM2KM
MERSCHROD
123 Warren Road
Ithaca, NY 14850
---- Tony Lelieveld <va3dwi at gmail.com> wrote:
=============
Kris,
When you said "Test one fuse at a time", I presume you meant Tube?
73, VE3DWI.
----- Original Message -----
From: <km2km at twc.com>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Tuesday, January 26, 2016 6:27 PM
Subject: Re: [TenTec] Model 411 amp (aka Centaur)
> I'm late chiming in. My problem with the fuses has always been a shorted
> tube. You are on the right track. Test one fuse at a time, or start
> with one, add another, then the third. BTW a matched set is better than
> an unmatched set HOWEVER, I had three misc tubes gathered over the years
> and put them in and do pretty well with them. I did that while waiting
> for a new matched set. Now the matched set is on the shelf waiting their
> turn!!!
>
> The guy at the local electronics store said to me one day when I bought a
> dozen fuses, "You do know that if you don't fix it then it will still blow
> fuses!"
>
> good luck,
>
> Kris
>
>
> Kris KM2KM
> MERSCHROD
> 123 Warren Road
> Ithaca, NY 14850
>
> ---- Joe Papworth via TenTec <tentec at contesting.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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