The Henry never came with 4-400's from the factory. They used 3-400Z's
The compatibility question with the 3-500Z has already been properly
answered by another earlier.
Carl
KM1H
----- Original Message -----
From: "AB5MM" <ab5mm@argontech.net>
To: <amps@contesting.com>
Sent: Friday, October 09, 2009 3:35 PM
Subject: Re: [Amps] Henry 2K-2
> Message: 8
> Date: Thu, 8 Oct 2009 09:41:22 -0500
> From: "Robert Perdue" <kc0hfl@cox.net>
> Subject: [Amps] Henry 2K-2
> To: <Amps@contesting.com>
> Message-ID: <FEE99C65818341A0B1A632E8019E7C8D@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
>
>
>
>
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