I recently purchased a photo-tube on eBay that i think i read of in the corona spark television article from the 1920's. I was the only one to bid on it, and i think i stole it at a price of $5 USD. It has ratings engraved on the side, and markings that tell which pins are positive and negative. It is actually quite large, and has a large sensitive area for direct placement behind an early non-flying spot camera disc.
You may or may not be able to see the images. They also may take a bit to load. I'm trying something different
The Tube
https://drive.google.com/open?id=0B3S-O ... 3RROHpRYXM
https://drive.google.com/open?id=0B3S-O ... ndVbGVjR3c
The Carton
https://drive.google.com/open?id=0B3S-O ... nZoalpOZkE
https://drive.google.com/open?id=0B3S-O ... 3ltVk85WGc
https://drive.google.com/open?id=0B3S-O ... WtpWlByMFU
A Sneak Preview Of The 3-D Printed Mirror Drum
https://drive.google.com/open?id=0B3S-O ... 3VvR0t1cEk
https://drive.google.com/open?id=0B3S-O ... Xl3c010Unc
EDIT: fixed the images, should be able to view them now.