[mikethedruid]

The reason why companies used carbon composition resistors in those days was because it was a choice between those or wire wound. Modern types were not commonly available until the 1990s. It was a matter of cost also. Wire wound were much better at maintaining their proper resistance over a long period, but they were also MUCH more expensive, so in most cases carbon composition resistors were the go to choice. I checked the resistors and they have actually stayed within tolerance except for a few. Interestingly several 2.2K resistors have drifted just over their 10% tolerance (silver band). Besides that, only one 4.7K was beyond its tolerance. Hammarlund was usually quite good about using good quality parts. They were considered top of the line in their day, and had a reputation to uphold.