Don Henschel
Forum Participant

To my surprise I started noticing voltage ratings for the so called metal film resistors?? WTH and I don’t remember seeing anything about this with the carbon resistors other than the wattage of these and this was fairly easy to determine using smoke signals. If the resistor didn’t change color or smoke it was a safe bet it was the correct size. How concerned should we be about this voltage rating of resistors or should one just get the carbon at lets say 5-10% tolerance? There was mention of arching or piercing of the film if the voltage was exceeded for these metal film resistors leading me to think other than fairly good tolerance values, perhaps they are on the “wimpy” side for tube circuits.