[TenTec] Ten-Tec 411 Centaur Amp Problem

[Kris Merschrod]

Thank you Jerry and also Gary for the copy of the manual.

Looking at the boards in the manual it seems straight forward to find the 
board.  Finding the "problem" unless there is a nicely burned out gizmo, 
will be a challenge.

Kris KM2KM
Merschrod
123 Warren Road
Ithaca, NY 14850
www.merschrod.net
----- Original Message ----- 
From: "Dr. Gerald N. Johnson" <geraldj at weather.net>
To: <tentec at contesting.com>
Sent: Thursday, May 27, 2010 2:47 PM
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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