If anyone wants to study up on Phillips tube codes here's a link to the manual:
https://frank.pocnet.net/other/Philips/PhilipsCodeListAB.pdf
I will just add that you will probably only find tubes with the 'NEW' CODE format as seen on page 3, and probably only the top illustration with the codes etched into the glass on the side of the tube.
https://frank.pocnet.net/other/Philips/PhilipsCodeListAB.pdf
I will just add that you will probably only find tubes with the 'NEW' CODE format as seen on page 3, and probably only the top illustration with the codes etched into the glass on the side of the tube.