[TenTec] Model 411 amp (aka Centaur)

[km2km at twc.com]

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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>>>
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