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Re: [Amps] AL-82 "Glitch" Protection

To: <>, " AMPS" <>
Subject: Re: [Amps] AL-82 "Glitch" Protection
From: R.Measures <>
Date: Sat, 24 Jan 2004 05:18:12 -0800
List-post: <>
**  The easy solution is to protect the meter movements with back to back 
3a diodes across the movements themselves.  Protecting the shunts 
requires some knowledge of polarity at the shunt, understanding that Si 
diodes Begin to conduct c. 0.5V,  as well as knowing basic Ohm's-Law.  

>Comparing grid and plate current metering circuits of the SB-220 and AL-82 I 
>find the AL-82 grounds the negative side of the plate meter. Trying to 
>sort out 
>how to install the metering glitch diodes is a bit confusing here. Of course 
>Ameritron's idea of an amplifier schematic doesn't make things any easier to 
>trouble shoot.
>Can anyone give me some help as to where to physically (electrically that 
>put these diodes. I can understand the one across the grid current shunt 
>resistor but I need help with the three in series from -HV to ground.
>Is there by chance a schematic of the AL-82 that incorporates all the sub 
>in one print?
>Thanks in advance.
>73, Don, W6OA
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