We had that year HR with a Magic Chef stove/oven. I replaced both valves before I could get the oven to work. Paid about what you quote and that was 15 years ago. Both Thermostat (and I remember "ELOT" and using a new knob) and Control/Safety Valve work on mercury like an old glass thermometer. No Thermocouples in that that Oven. You'll be lucky to get those mercury-charged parts. The nanny agencies have banned mercury and owners of much newer stoves than yours are being told the whole appliance needs to be replaced. If you like yours and can get the valves, suggest you do so while you still can. FYI You can bank on anything Chris Bryant tells you about RV repair.
