How can i test an old tube?, well..in general, how can i test a tube to assure it's working ok?
Thanks!
the easiest way is to plug it into a known working circuit... if it works it works. If not, then not. Otherwise, an old fashioned tube tester would be in order. Available on ebay if you have the $$$. Or, if you have an old electronics/surplus store around they may still have a tube tester lurking in the backroom. Make some phone calls and check it out.
good luck.