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Re: [TenTec] Model 411 amp (aka Centaur)

To: km2km@twc.com, tentec@contesting.com
Subject: Re: [TenTec] Model 411 amp (aka Centaur)
From: Joe Papworth via TenTec <tentec@contesting.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Thu, 28 Jan 2016 09:56:13 -0500
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
 PS- I guess the big in-rush clunk is "normal" but it can be cured with a 
soft-start mod.


-----Original Message-----
From: km2km &lt;km2km@twc.com&gt;
To: Discussion of Ten-Tec Equipment &lt;tentec@contesting.com&gt;
Cc: k8mp &lt;k8mp@aol.com&gt;
Sent: Thu, Jan 28, 2016 9:45 am
Subject: Re: [TenTec] Model 411 amp (aka Centaur)

 
 
 
Good morning Joe, 
 
Yes, my AMP does make a "thunk" when turned on,  but, for example,  I have been 
 
using it for an hour.  Then I turned it off.  Now, 15 minutes later, I turn it  
on and it does not "Thunk". 
 
I found that this AMP was built well, and the only issues for over 20 years 
have  
been the tubes, and of of the toggle switches  (IP/EP).  The change to 10 
meters  
was a snap. 
 
Yes, it could have a quieter fan, but it is a good AMP and makes an S-unit  
difference. 
 
Good luck with the tubes.  BTW  I have used it with only two tubes, while  
waiting for a new set.   
 
Kris 
 
Kris KM2KM  
MERSCHROD 
123 Warren Road 
Ithaca, NY 14850 
 
---- Joe Papworth via TenTec &lt;tentec@contesting.com&gt; wrote:  
 
============= 
Hi Kris, 
Thanks for the info. 
It sounds like that store proprietor had gone a few rounds with some rigs. Hi 
hi 
I'll try the tubes by adding one at a time tomorrow. 
Say, does your Centaur make a loud in-rush clunk when you fire it up? 
And where did you buy your matched set? 
 
Later, Joe, K8MP 
 
 
Sent from AOL Mobile Mail 
 
 
-----Original Message----- 
From: km2km &lt;km2km@twc.com&gt; 
To: Discussion of Ten-Tec Equipment &lt;tentec@contesting.com&gt; 
Sent: Tue, Jan 26, 2016 06:28 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 &lt;&lt;a 
href='tentec@contesting.com?'mailto:tentec@contesting.com'&gt;tentec@contesting.com&gt;
  
wrote:  
 
============= 
It has stayed on with the tubes removed for a while.? 
I'm examining/ohming the tubes now. 
 
 
-----Original Message----- 
From: Carl Moreschi &lt;&lt;a 
href='n4py3@earthlink.net?'mailto:n4py3@earthlink.net'&gt;n4py3@earthlink.net&gt;
 
To: wb5jnc &lt;&lt;a 
href='wb5jnc@centurytel.net?'mailto:wb5jnc@centurytel.net'&gt;wb5jnc@centurytel.net&gt;;
  
Discussion of Ten-Tec Equipment &lt;&lt;a 
href='tentec@contesting.com?'mailto:tentec@contesting.com'&gt;tentec@contesting.com&gt;
 
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  
&lt;a href="http: www.n4py.com" target="_blank"&gt;www.n4py.com  
  
On 1/26/2016 2:54 PM, Al Gulseth wrote:  
&gt; Joe,  
&gt;  
&gt; Just an ohms check may not be enough. You may be dealing with an 
intermittent  
&gt; breakdown under high voltage. A "hi-pot" (high potential) test with an  
&gt; insulation tester etc. would be the only way to know for sure. A winding  
&gt; layer to adjacent layer partial short in the HV side could also account 
for  
&gt; your symptoms, and might not be obvious because the winding resistance 
could  
&gt; show right at the low edge of the manufacturer's spec. (I went through 
that  
&gt; scenario years ago with a HV filter choke in a small AM BC transmitter.)  
&gt;  
&gt; 73 es GL, Al  
&gt;  
&gt; On Tue January 26 2016 11:28:03 am Joe Papworth via TenTec wrote:  
&gt;&gt;     Thanks Andy. Was it the HV secondary that shorted?  
&gt;&gt;  
&gt;&gt;  
&gt;&gt;    I isolated the HV secondary from the HV board and it reads open to 
the  
&gt;&gt; frame and chassis. (Reads about 45 ohms when connected to the board)  
&gt;&gt;  
&gt;&gt;  
&gt;&gt;    Thanks, Joe, K8MP  
&gt;&gt;  
&gt;&gt;  
&gt;&gt;   -----Original Message-----  
&gt;&gt;   From: P C Andy Anderson&lt;&lt;a 
href='xtraham58@hotmail.com?'mailto:xtraham58@hotmail.com'&gt;xtraham58@hotmail.com&gt;
  
 
&gt;&gt;   To: Discussion of Ten-Tec Equipment&lt;&lt;a 
href='tentec@contesting.com?'mailto:tentec@contesting.com'&gt;tentec@contesting.com&gt;
  
 
&gt;&gt;   Sent: Tue, Jan 26, 2016 11:52 am  
&gt;&gt;   Subject: Re: [TenTec] Model 411 amp (aka Centaur)  
&gt;&gt;  
&gt;&gt;  
&gt;&gt;  
&gt;&gt;  
&gt;&gt;   Joe, I had a similar problem with my Centurion AMP.  It eventually 
failed  
&gt;&gt;   completely. The secondary of the power transformer shorted to the 
frame. I  
&gt;&gt; had the Xformer rewound at TRS.  BTW this transformer problem is a 
known.  
&gt;&gt;  
&gt;&gt;   73' Andy, W3LI  
&gt;&gt;  
&gt;&gt;   ________________________________________  
&gt;&gt;  
&gt;&gt;  
&gt;&gt;   Tuesday noontime, Joe:  
&gt;&gt;  
&gt;&gt;   I have a Centaur..............keep it covered when not in use.  
&gt;&gt;  
&gt;&gt;   My Elmer told me to always keep it covered..................dust is 
the  
&gt;&gt;   problem.  
&gt;&gt;  
&gt;&gt;   Even when covered, open it up every two-three years and do a 
internal  
&gt;&gt;   cleaning.  
&gt;&gt;  
&gt;&gt;   N1MHC/alsirois  
&gt;&gt;   =============  
&gt;&gt;  
&gt;&gt;  
&gt;&gt;  
&gt;&gt;   Gents,  
&gt;&gt;  
&gt;&gt;  
&gt;&gt;   Have any of you gone a few rounds with a Centaur amp?  
&gt;&gt;   I have a one that blows fuses very intermittently. It vaporizes them 
both,  
&gt;&gt;   simultaneously, so it's apparently a dead-short somewhere. This 
happens  
&gt;&gt; even in stand-by. (i.e. No key-down)  
&gt;&gt;  
&gt;&gt;  
&gt;&gt;   Before I tear into it, anyone have any ideas of common failures in 
these  
&gt;&gt;   amps?  
&gt;&gt;  
&gt;&gt;  
&gt;&gt;   Later, Joe, K8MP  
&gt;&gt;  
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