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Re: [TenTec] Centurion loading

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Centurion loading
From: Robert & Linda McGraw K4TAX <RMcGraw@Blomand.Net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Mon, 20 Jun 2005 18:43:49 -0500
List-post: <mailto:tentec@contesting.com>
Depending on antenna/load characteristics, being 50 ohms resistive, or close 
to 50 ohms with some amount of reactance, the loading control on the amp 
should be about #4 at 4.0 MHz, #6 at 3.8 MHz, and  # 8 at 3.6 MHz.  Tune 
should be about #4 at 4.0 MHz, #5 at 3.8 MHz and #6 at 3.6 MHz.   The load 
control definitely has noted effect on 80/75M.

My amp was purchased new from Tentec in March of 1996.  No updates applied. 
Still running original tubes with full rated output power.  The Paragon II 
or the Omni VI+ will drive it to full rated power.

Make sure you know what your load is.  Power output on 75M should be 1200 
watts or more.  Also are you running the amp on 230 VAC?  or 115 VAC? 
Unless you have a really stiff 115 VAC service, the regulation and power 
output will suffer.  It is not recommended to run the amp on 115 VAC 

Bob, K4TAX

----- Original Message ----- 
From: "Mike Hyder -N4NT-" <mike.hyder.n4nt@charter.net>
To: "Ten-Tec Reflector" <tentec@contesting.com>
Sent: Monday, June 20, 2005 4:44 PM
Subject: [TenTec] Centurion loading

> I'm new to this Centurion thing and have a couple of questions:
> My loading control does not seem to have much effect on 80 meters.  I
> believe the amplifier acts as if it does not have sufficient load
> capacitance.  I base this on my finding that I can never create too much
> grid current and that the maximum output occurs with the Load control set 
> on
> 10, which I assume is maximum capacitance.  If my assumptions are wrong,
> please tell me.
> I purchased the amplifier new from Ten-Tec in September 2003.  Can someone
> tell me if there have been updates to this amplifier centered around the
> load capacitance?  Are there modifications suggested on the same subject?
> Thanks and 73,
> Mike N4NT
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