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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: "Al Sirois" <alsirois@roadrunner.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Thu, 4 Feb 2016 12:52:43 -0500
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
TUBES..........My T-T Manual says to use 811-A, not 572-B.....>

I bought matched tubes from RF Parts in 1999 and they are still in the amp

and working fine. I got 450 W out of them this morning on 80 meters.

I do have spare 572-B's, but they are for my back-up amp a FL-2100-B.

I've never swopped the tubes between the two amps..... I probably don't want to.

Good Luck with you guys in this discussion group.

N1MHC@arrl.net
Al Sirois
East Boothbay, ME 04544-0002
==========================

-----Original Message----- From: Joe Papworth via TenTec
Sent: Thursday, January 28, 2016 9:54 AM
To: km2km@twc.com ; tentec@contesting.com
Cc: k8mp@aol.com
Subject: Re: [TenTec] Model 411 amp (aka Centaur)

Thanks Kris,
If I was desperate, I'd run it on two tubes.?
BTW- I haven't bit the bullet on a new tubes yet cuz from what I read on the net, the ones on the market now just plain suck.


Seeeeeeeeeeeeya, Joe


-----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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