17" Motorola B&W from '55 (not a good day)

[dieseljeep]

Originally Posted by radiotvnut

I was first going to check this tube with my Sencore CR70; but, it decided to misbehave. So, I pulled out the old beat up B&K 465 beast and I made sure that it was putting out the correct filament voltage as per what it was registering on the meter of the tube tester. Before my filament blew, it looked unusually bright on 6.3 volts.

The heater was already damaged when you got the set. It evidently failed and re-welded itself. Also too heavy tapping on the neck, in a rejuvenation attempt.
Check with ETF. They might have one, as I got lucky and bought a high-quality rebuilt 23EGP22A. Those are more rare than a 17H.
You can also use a 17BP4, but you have to fit a magnetic focus unit.
I see it has yoke plastic rot.