Quote:
Originally Posted by jr_tech
You could ohm out the heaters... if they are already open they have likely burned out because the tube has gone gassy. Game over.
If they are not open, you could apply 6.3 volts and see if they light up normal brilliance ... if they do, the tube could be good, further testing is necessary.
If they only glow dim and the neck quickly gets hot the tube is likely gassy... a few minutes of this and they likely will blow out. Been there, seen that 
Regardless, that is a heckofa good score, congratulations! 
jr |
That's a good suggestion. I'll try that soon. I can almost guarantee the tube is bad because I just sold a working 15GP22 to another member here before getting this set, thereby ensuring that I would need one myself in the very near future.