[Boatanchors] Carbon Comp Resistors

w5jo at brightok.net w5jo at brightok.net
Wed May 6 12:23:02 EDT 2020


My past experience has been that they will continue to change when in 
service.  If they are out of the marked tolerance I replace them with 
ceramic types.

I recently found a NC 183D that had been sitting for years unmolested. 
Every resistor I checked was within tolerance but, if I use the set 
regularly, I expect to change them as time goes by.  Who has a case that 
shows the underneath of the chassis anyway.  I want my stuff to work with 
minimal repairs as long as I live.

Jim
W5JO



-----Original Message----- 


I too have endless miles of old carbon comp resistors.  And just about all 
of them have changed value.IIRC, i have read where some have had success 
bringing them back to value by heating them in an oven, but I think most 
have discarded that treatment as ineffective.So ... my question is:  can I 
use a resistor that say, has drifted up 40% to 100K ohms as a 100K ohm 
resistor?  Is it apt to stay within 10% tolearnce after use?Guessing this 
has been "asked and answered" but hopefully someone can indulge me on this 
list.Thanks.JeffW8KZW



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