The second tube (I have two) is a "931" which is a photo multiplier tube. I give up, what were these used for?
Any additional info, on either, would be appreciated!
Google is easy
A photomultiplier tube, electron multiplier tube that utilizes the multiplication of electrons by secondary emission to measure low light intensities. It is useful in television camera tubes, in astronomy to measure intensity of faint stars, and in nuclear studies to detect and measure minute flashes of light.
https://www.britannica.com/technology/photomultiplier-tube Photomultiplier Information
931A Information