The Heatkit AF-1 Analog Frequency Meter, Intermission.
One of the things I’ve been considering with the Heathkit AF-1 I have on the bench right now is the potentiometers. The originals were 200Ω wirewound rheostats, but the original owner of the device replaced some with 5kΩ carbons.
I've identified some new potentiometers for this unit, and I'm going to have to stay with what the original builder used. Check it out on my project page.