Checking the 3-500 tubes

[John Q. Doe]

To all:
  I ran across 3, 3-500 tubes made for the SB-220 (and other) amps. I need to
check these tubes the easiest way. Is there a way of checking these tubes for
worthiness with a VOM meter or would I have to put them in an amp under a load?
I
do have an SB-220. Any comments would be useful. Thanks for your for your help.

   GT

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