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Re: [Amps] SB-220 HV meter on zero

Subject: Re: [Amps] SB-220 HV meter on zero
From: "Mike Manship" <>
Date: Wed, 2 Nov 2016 17:02:03 -0400
List-post: <">>
The SB-220 has a built-in shorting stick.

Mike W9OJ

-----Original Message-----
From: Amps [] On Behalf Of Vic Rosenthal
Sent: Wednesday, November 02, 2016 1:45 AM
To: Catherine James <>
Subject: Re: [Amps] SB-220 HV meter on zero

Make a shorting stick -- a dry wood or fiberglass stick about 16" long with
a hook at one end, and a wire from the hook going to a good-quality
alligator clip. When you open the amplifier, connect the clip solidly to the
chassis and touch various spots in the power supply and plate circuit with
the hook, and then hook it to a hv point and leave it there while you work.
Use it religiously -- never open the amp without it no matter what. Just
another level of security. 

Vic 4X6GP

> On 1 Nov 2016, at 04:10, Catherine James <> wrote:
> OK, found schematics (thanks Bob W1ICW). Looking at the glorified voltage
divider, I'm guessing it's just an open resistor on the meter board. I'll
have a closer look at it later this week. 
> Hoping the meter coil isn't bad...
> Cathy
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