Just got a B&K 466 CRT tester today...
It came with sockets 2, 3 and 4. There was not a #1 adaptor.
I was wondering if adaptor #1 is just the main cable?
It fits on my CRT , but not sure if there should be a separate #1 socket?

I was wondering if adaptor #1 is just the main cable?


Yep.

Thanks, I'll go ahead and test!

Just do not use that tester for its "rejuvenate" function. It is a heavy-handed device that may make an old CRT worse than it was before. Testing with that model is fine.