B&K 650 tube tester not working, need help

[War Bird Radio]

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! 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

 

[fdegrove]

Hi,

Nothing on the 650 but maybe the 500, 700 or Boeing😉 747 will help.

LOOK UNDER PRUFGERATE

Cheers,😉