[ARC5] Carbon Comp Drift

[Richard Knoppow]

    Heat always seems to make CC resistors go high. Evidently 
that is why they are never closer than 5% tolerance, the heat of 
soldering them in can make them move more than that. Metal oxide 
resistors are probably the best replacement for composition 
resistors in applications like cathode resistors. Not expensive.

On 3/2/2019 4:02 PM, Glen Zook wrote:
> The 6-cathode resistors in the Heath SB-Line and in the Collins 
> 32S- series transmitters and the KWM-2- series transceivers, that 
> serve as the "plate" current (actually cathode current) meter 
> shunt, go high all the time.  I automatically replace those 
> resistors with modern 1-watt, 5% tolerance, resistors which are 
> now pretty close to the same size as the original resistors.
> 
> 
> 
> Those resistors are 10-ohm and 12-ohm in value and always go high 
> in value.  This then throws off the meter calibration so that the 
> meter reads a higher value than what is really being drawn by the 
> final amplifier tubes.
> 
> 
> Glen, K9STH
> 
> Website: http://k9sth.net

-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL