Hickok 799. Or B&K 667 tube Checker: I have found that the Hickok 799 tube checker was made in 1965 so it should check most tubes. I have not found anything on production dates of the B & K. I assume early 70’s. I don’t think any or very few new type tube designs were made past 1965. But the Hickok should test some of the older type tubes than the B & K. so what is your opinion, if you had access to either one and bought one of them. What would you buy?