[Amps] plate voltage meter shunt

Carl km1h at jeremy.mv.com
Sun Nov 4 07:27:05 EST 2012


The string of 10 1M 1/4W Chinese carbon resistors on the Harbach SB-220 
board are a prime example of a poor choice.

Carl
KM1H


----- Original Message ----- 
From: "Jim W7RY" <w7ry at centurytel.net>
To: "Carl" <km1h at jeremy.mv.com>; "Douglas Johnson" <w9iix1 at yahoo.com>; 
"AMPS" <amps at contesting.com>
Sent: Sunday, November 04, 2012 12:52 AM
Subject: Re: [Amps] plate voltage meter shunt


> Yes they do. I used one in my Drake L4B. The stock string had an 
> intermittently open resistor causing intermittent plate voltage reading.
>
> 73
> Jim W7RY
>
>
> -----Original Message----- 
> From: Carl
> Sent: Saturday, November 03, 2012 2:46 PM
> To: Douglas Johnson ; AMPS
> Subject: Re: [Amps] plate voltage meter shunt
>
> Mouser carries Ohmite flatpak HV resistors; Ive been using them to replace
> the old carbons in many amps.
>
> Carl
> KM1H
>
>
> ----- Original Message ----- 
> From: "Douglas Johnson" <w9iix1 at yahoo.com>
> To: "AMPS" <amps at contesting.com>
> Sent: Saturday, November 03, 2012 5:15 PM
> Subject: [Amps] plate voltage meter shunt
>
>
> I am installing a meter to measure plate voltage 1-5000v@ 1a dc, the meter
> has a 1ma fs rating. the serial resistance I have made up in the past has
> been 3 watt metal film resistors in series. since they can only rated for
> 200v per resistor it takes many to do the job. Can some other resistor 
> type
> with a higher rating be used in a safe manner for this purpose?...tnx,
> Doug,w9iix
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