[Boatanchors] Replacing Meter Shunt Johnson Valiant
Glen Zook
gzook at yahoo.com
Wed Jul 18 10:12:23 EDT 2018
1% resistors are available and are not expensive.
Glen, K9STH
Website: http://k9sth.net
From: Rodger Singley <wq9nsc at live.com>
To: 'BoatAnchors QTH' <Boatanchors at mailman.qth.net>
Sent: Wednesday, July 18, 2018 8:33 AM
Subject: Re: [Boatanchors] Replacing Meter Shunt Johnson Valiant
For shunts I order replacements from Mouser rather than fooling with trying to cut a wire to length. It is very common in kit built Johnson transmitters to find final and modulator plate current shunts that are far from the desired value because the builder was expected to cut very small pieces of nichrome wire and end up with the exact very short length AFTER tinning; fortunately most of these were cut too long so the meter reads on the safe side (high) and this is a common cause of low power output from a Valiant. 5% resistors are fine; the original Johnson meter movement wasn’t a high precision build and it certainly hasn’t gotten better in 50 or 60 years of usage.
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