1962 RCA B&W Portable

[Electronic M]

Originally Posted by TUD1

My line voltage was actually 118 on the dot. I checked. If I run the window A/C or the space heater, it gets down to 105. I don't think I have this set's horizontal output tube in my tube box, but I'll check.

The point I was making is that if that history classroom has lower line voltage you get less sweep width/height, and if it has more you get more.

You can see this effect in action if a large appliance on the same circuit like a fridge or central A/C kicks on or off while you are watching the set...You will actually see the image grow or shrink and brightness change in step with it.

There is an industrial park roughly a mile away from me and I presume they have a device that can dip the grid a few volts and back a couple time a second continuously (since a while back that was a regular occurrence)...Once is interesting, but continuously can become annoying real quick.