I have a Hickock tube tester I bought years ago from Andy Bouwman at Vintage Tube Services. He had calibrated it, which I believe to be important with the older testers. In addition to the drawbacks that larryi mentions, another drawback to an older one like this is that it may not work with some of the newer tube types like your 6H30 (or at least it won't show it on the tube types on the tester's table that you use to set the type), but it does work well with the types I used it for in the past.
Anyone Here Ever Purchased A Tube Tester?
Once or twice a day a tube sputters for a brief second in my Audio Research Reference DAC. The Reference DAC is connected directly to my amplifier and it also serves as my preamp. Visually, all of the tubes look fine. Visually, I can’t tell which tube may be bad.
The tubes are: (4) 6H30, plus (1) 6550C and (1) 6H30 in power supply
Have any of you ever purchased a tube tester to test your tubes? If so, what tube tester are you using?