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Re: [Amps] Checking SB-220 meter continuity

Subject: Re: [Amps] Checking SB-220 meter continuity
From: Jim <>
Date: Tue, 26 May 2020 12:12:00 -0500
List-post: <>
Its most likely mechanical.

Corrosion builds up between the washers on the studs of meter. Both on the inside and outside. I've also hears of instances where it can be the meter movement itslef with a bad connection on the band or adjusting mechinisem.

Seems to me the meter movement is about 150 ohms.

Jim W7RY

On 5/26/2020 10:02 AM, Steve London wrote:
The plate current meter in my SB-220 has gone flaky. R1, R2, R3 and the zener diode are fine. Sometimes, I can tap on the meter and it will come to life. Using something like a Fluke 87, what should the continuity across the meter measure ? Just want to determine if this is a mechanical problem or electrical problem.

Steve, N2IC
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