B&K 650 tube tester not working, need help

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War Bird Radio

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Joined 2004
B&K 650 tube tester not working, need help

I have a beautiful B&K 650 that has quit working when in test switch #1 position! :bawling: But it will work when in test switch 2 & 3 position with a two or three section tube. I do not find any loose wires on the switch or anything abnormal. I also cannot find a schematic anywhere. Can someone help, please?

Thanks,
John
 
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