[TenTec] Ten-Tec 411 Centaur Amp Problem

[CSM(r) Gary Huber]

Not much to that input circuit.... see it at http://www.tentec.com/files/Model%20411%20Centaur%20Owner%20Manual.pdf

73,

Gary - AB9M



--------------------------------------------------
From: "Dr. Gerald N. Johnson" <geraldj at weather.net>
Sent: Thursday, May 27, 2010 1:47 PM
To: <tentec at contesting.com>
Subject: Re: [TenTec] Ten-Tec 411 Centaur  Amp Problem

> That would tend to indicate the cathode circuit tuning is out of whack 
> on 40 meters, whether it just needs tuning or some parts have change 
> value, is what you have to find next.
> 
> 73, Jerry, K0CQ
> 
> On 5/27/2010 1:14 PM, Kris Merschrod wrote:
>> Rick,  Thank you - I'LL ANSWER THE QUESTIONS IN CAPS.
>>
>> Kris KM2KM
>>
>>> Need more info:
>>>
>>> 1.  Have you tried it on a dummy load?  If so, was it OK, or also 375w on
>>> 40m?
>> YES, SAME PROBLEM
>>>
>>> 2.  Did this suddenly occur, or has it always been this way?  Or is it new
>>> and being tried first time?
>> IT HAS BEEN THIS WAY FOR A LONG TIME.  ABOUT FOUR MONTHS AGO I REPLACED THE
>> TUBES WITH A MATCHED SET - SAME PROBLEM
>>
>>>
>>> 3.  What transceiver are you driving it with?
>> TEN TEC DELTA II
>>>
>>> 4.  What is the SWR between the transceiver and the Linear on each of
>>> these
>>> bands?
>>
>> BINGO   3:1  ON 40 METERS NO SWR ON THE OTHERS  WHEN IN LINE WITH THE AMP ON
>> AND TUNED UP
>>>
>>> 5.  What is the output of your transceiver on each of these bands?  (If
>>> it's
>>> down on 40, then the issue is not the linear).
>>
>> OK, IT IS CUTTING BACK B/C OF THE SWR
>>>
>>> 6.  Assuming this has suddenly occurred, and it was previously working
>>> correctly, carefully examine the settings of the Tune and Load controls.
>>> Have they changed significantly from their settings when it was working
>>> properly?
>>
>> MOOT QUESTION NOW
>>>
>>> When we know the answers to these questions, maybe something will give us
>>> further clues.
>>>
>>> 73
>>> Rick
>>>
>>> -----Original Message-----
>>> From: tentec-bounces at contesting.com [mailto:tentec-bounces at contesting.com]
>>> On Behalf Of Kris Merschrod
>>> Sent: Thursday, May 27, 2010 12:55 PM
>>> To: Discussion of Ten-Tec Equipment
>>> Subject: [TenTec] Ten-Tec 411 Centaur Amp Problem
>>>
>>> Wow, now that Joe (K0BX)  has managed to slid in edgewise by taking
>>> advantage of the great TT QSK while the discussion group was in CW
>>> mode!!!!
>>>
>>> Here is the issue that I have.  On 40 meters, into a resonant 40 meter
>>> loop,
>>>
>>> the Centaur will only put out 375 atts.
>>> On 80 meters and 20 meters it puts out the appropriate power  (500+ Watts)
>>> while using a tuner into an 80 meter dipole.  On 40 Meters, through the
>>> tuner, into an 80 meter diople it will only put out the same 375 watts.
>>>
>>> Where can the problem be?
>>>
>>> Kris KM2KM
>>> Merschrod
>>> 123 Warren Road
>>> Ithaca, NY 14850
>>> www.merschrod.net/KA2OIG.htm
>>>
>>> _______________________________________________
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>>
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