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

[fumplet]

I think this is a 10bp4 but not too sure as the filament sure doesnt get very bright and the neck of the tube doesnt get hot either. zero emissions as well as zero cutoff. Do I have a 10bp4 or is it something else that needs more than 6.3 volts a/c to work? I cranked up the sencore cr70 volts to 8+ volts and the neck started to get warm as well as the usuall cr70 high pitched whine it makes when a normal crt filament load is applied to it. cr70 needle went just into the green at 8 plus volts. Gone to air, tube base pins need resoldered or maybe taken apart? I have tried several times to resolder the pins. The neck of the tube doesnt have the burnt filament shield from high hours of use. At normal 6.3 volts it doesnt get the neck of the tube hot at all. Is there a tube that takes like 12 or less volts but above 6.3?