I checked the voltage on the bulbs that have been burning out in the oven; they're 120. I found a 130 volt version on Amazon and will send for a couple of those. I thought an LED bulb might last longer but I couldn't find any oven LEDs.

I removed the dead bulb and screwed in the receptable/socket adapter. I found that the voltage at the socket varied between the extremes of 120-106 over the course of a few minutes but generally hung around 112. I tried turning on the oven heating element and the stove top burners to see if there was any bleed-over of the higher voltage but that made no difference.

Digression: I was a bit concerned about the fluctuation in voltage so I tried a few outlets around the house; they all had about the same range. Is this something I should be concerned about? Maybe I should check the breaker box to make sure all of the connections are tight.

Back to the kitchen: Unplugging the stove, I checked the socket for defects and found none. I did clean it out with a 12ga shotgun cleaning bronze brush and bent the center contact tab up a bit to ensure good contact. After vacuuming out the socket, I replaced the bulb. I noticed that it screwed in much easier this time; maybe there had been some carbonization of the threads or something in the socket.

Plugged it in and turned on the light; the new bulb lit. Hopefully it will last for a while.

Paul