What picture tube do I have and why does it not get hot at the neck.

[Penthode]

Originally Posted by bandersen

He said emissions are just into the green at 8 volts.
There were 8.4 volt @ 450mA CRT filaments starting in the mid 50s as Tom mentioned. Possibly it was rebuilt with one? Seems unlikely but it's possible.

Check the CRT filament current at 6.3 volts. If it's around 0.6A, you can be sure it's a 6.3 volt filament.
Easy to do with your setup. Put a DMM in current mode between one of the CR70 filament clip leads and the CRT pin.

Sorry I missed that and misinterpreted the needle going into the green. Green means good.

So at 6.3 vac, is it not going into the green?