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Re: [Amps] Henry 2K-3 PS Mod

To: Kevin LaHaie <>, Amps reflector <>
Subject: Re: [Amps] Henry 2K-3 PS Mod
From: Vic K2VCO <>
Date: Fri, 21 Mar 2008 13:15:23 -0700
List-post: <">>
Kevin LaHaie wrote:
> Hello
> I am planning to convert the stock P/S in my Henry 2K-3 to a purely 
> capacitor filter primarily to increase the HV, but in addition some way 
> that capacitor filters are better for SSB.   My other, newer Henry's (2K 
> Classic X and 3K Classic X Mark II) still use the choke filter design, 
> albeit with higher voltages, and never had a complaint!

> 1. What changes to the biasing is necessary with the higher plate voltage

According to the 3-500z data sheet 
<>, class AB2 operation at 
3000v requires a cathode voltage of +10v, with 3500v requiring +15v. The 
2K3 schematic shows a 1N2808B zener in the cathode circuit, which is a 
10v 50w part.

I would keep a couple of other things in mind. Gain will be higher with 
higher plate voltage, so any tendency to instability will be magnified.

I don't know what the plate spacing of the tuning capacitor is, but make 
sure it is enough for the increased voltage.

I am not sure this is a good idea. Why do you want to do this?

Vic, K2VCO
Fresno CA
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