[NJARC] Need help from members for question I can't answer

[donald ball]

 I received an e-mail from my Nephew in North Carolina who is starting
to get interested in some of my late Brothers old radio "stuff".
Jim would like to know if he can test a Western Electric USN G5 300A
tube on his model 600 Knight tube tester. I don't have the foggiest idea.
Can one of our members help?   Thanks,  Don Ball  732 229-7890
 roadkilled229 at comcast.net