Can this be caused by using the same PSU in a different machine? Can anyone offer any advice? I sent lightobject an email and have not yet received a response but it is after hours. Thanks all
To the best of my knowledge a PSU should not have an immediate effect on a new tubes TEM. Unless maybe the PSU is running a very high current though the tube?
Room temp would have been fine. Not sure exactly how hot is too hot, just wanted to make sure it wasn’t stored near a source of heat like a space heater.
I don’t think a LPS would cause a mode shift. To my knowledge mode shifts are the result of changing resonator geometry. We usually see this when a tube has been overheated or very old.
You didn’t by any chance get the tubes mixed up :)?