You could try cleaning the switches and see if that helps. Use a quality product like DeOxIt or RidOx, and make sure you don't get any on the meter face.
As far as people belittling tube gear, show them an eBay auction for a Fisher or McIntosh amp. I constantly battle people with the same attitude, not just about tube gear, but stuff made in America. You have a good attitude! I'm curious if your class ever discusses the fact that stuff like this is almost never made here anymore.
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