[ARC5] Carbon Comp Drift

[Richard Knoppow]

    This is pretty much the pattern I've found, the higher the 
original value the more they drift but I've also found low value 
resistors that have drifted a lot. For instance the 15 ohm 
cathode resistors in some Drake transmitters. Some, appeared to 
be Ohmite, were close but others were up to 20 or 25 ohms. These 
had longitudinal mold marks on them, I have no idea of the brand. 
In the Drakes the resistors are part of the circuit that measures 
plate current, its important they they are close to the right 
value. There are other CC resistors in this circuit and are 
frequently off value. In my AR-88 resistors below about 50K were 
close enough to leave alone but higher values were way off. I 
have no idea of who made them.

On 3/2/2019 1:16 PM, Robert  Eleazer wrote:
> Here are the results of the resistance tests done on the GRC-9 
> receiver this morning:
> 27K marked = measures 28K
> 270K marked = measures 651K
> 150K marked = measures 246K
> 1 meg marked = measures 1317K
> 1 meg marked = measures 1350K
> 470K marked = measures 650K
> 56K marked = measures 86K
> Obviously, all but the 27K resistor need to be replaced
> Wayne
> WB5WSV


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