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Re: [Amps] plate voltage meter shunt

To: "Jim W7RY" <w7ry@centurytel.net>, "Douglas Johnson" <w9iix1@yahoo.com>, "AMPS" <amps@contesting.com>
Subject: Re: [Amps] plate voltage meter shunt
From: "Carl" <km1h@jeremy.mv.com>
Date: Sun, 4 Nov 2012 07:27:05 -0500
List-post: <amps@contesting.com">mailto:amps@contesting.com>
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@centurytel.net> To: "Carl" <km1h@jeremy.mv.com>; "Douglas Johnson" <w9iix1@yahoo.com>; "AMPS" <amps@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@yahoo.com>
To: "AMPS" <amps@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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