[Amps] Henry 2K-2

[AB5MM]

Message: 8
Date: Thu, 8 Oct 2009 09:41:22 -0500
From: "Robert Perdue" <kc0hfl at cox.net>
Subject: [Amps] Henry 2K-2
To: <Amps at contesting.com>
Message-ID: <FEE99C65818341A0B1A632E8019E7C8D at Bob>
Content-Type: text/plain;	charset="us-ascii"

Looking for some input on using 3-500Z in the 2k-2 as opposed to the 4-400's
The 400's were zero bias and I have heard of folks just putting in the 3-500
without any mods. Any thoughts?

Bob   


I just got through performing this exact mod on my friends Henry.

1. The sockets can be lowered in the chassis to allow use of existing chimneys...
   or you can leave the sockets "as is" and purchase new (taller) 3-500Z chimneys.
2. There is a set of contacts on relay R3. This is where I placed the 50w/8.2 volt zener     
   for bias on transmit.
3. You must change the anode contact plate cap's. for the 3-500Z. Larger Post.

It's a pretty straight forward conversion. We also replaced the 3B28's in the power supply, but that is another story.

Hope this helps and good luck.

Steve
ab5mm