My dad built a few Heathkit devices like signal generators, etc. for his home electronics repair sideline in the 1960's and 70's, and as I reached max capability at building plastic model kits he asked me to build a Heathkit oscilloscope. It was a whole new universe, but the satisfaction was indescribable. He was a wizard, and I did my best. Between Heathkit, Radio Shack, military surplus, and later Fry's in San Jose, I was in tech doodad heaven.