[HBR] HBR-11; lessons learned to date

[match at ece.utah.edu]

Tom Nickel wrote:

> Speaking of components, in an attempt to preserve the
> vintage look of the 60's I have been using NOS and recycled carbon
> composition resistors.
> 
> I think I read where the carbon comp
> resistors drift up in value over time?? Well, last night, I pulled
> out a 100 Ohm 10% 1/2-watt resistor from my junk box.? After cleaning
> off the gunk, my DMM measured the unit at about 148 Ohms!

Yes they drift upward. Sometimes you can bring them back down by cooking 
them in your wifes oven for an hour or two at 350 when she's off visiting her 
Mom.

Another point: If you're using carbon comp resistors, even the NOS ones are 
probably old and should be checked and possibly cooked.

Marvin
KA7TPH