Tube tester...anyone own their own?

I have five, i.e., Stark, Marconi, B&K, Heathkit, and a Western Electric KS-15750-L1 from estate of Alan Douglas who wrote The Book of Tube Testers and Classic Electronic Test Gear.

They are all sweet :)

I hadn’t been aware that Alan Douglas had passed away, but I see via a quick Google search that he died unexpectedly in 2015 at the age of 72. Very sad.

I have the definitive and beautifully done series of books he authored on "Radio Manufacturers of the 1920s."

On another note, Grant (Tvad), great to see you back here! Hope all is going well for you.

Best regards,
-- Al

@ the OP, if you are testing drivers ok, for testing output power tubes not really worth the money
Tube testers are old instruments, with degraded parts, right now Roger is trying to rebuild the transformer of a 752 A I sent him some time ago, Roger he is one of the best if not the best, very honest and straight person. With the tester calibrated and ready to go it is advisable to use a variac to supply plate current to the tube so the measurement is more accurate if your tester is old like most are.

Don expect you will be able to measure tubes with high precision, unless you spend a lot of money and time. I own a BK707 too and it is a toy it constantly drifts.

Not trying to discourage you but it all depends on what you want it for. Which tubes and amp / preamp will you be using? How often will you be measuring?

I've also owned an Amplitrex AT1000 tester for around 10 years now, and have found it to be completely reliable, accurate and easy to use. Yes, it is expensive, but well worth the money if you are a serious tube audio enthusiast. As mentioned above, a lot of very well known tube sellers are selling both NOS and new production tubes out there which often do not test anywhere near what they claim they do, and use old testers that give confusing results that they try to dupe buyers into believing they are getting more than they really are. Don't fall for the "platinum matched" scam presented by some sellers who charge a lot of extra money for their tubes, claiming that they match within a few percent of each other, when in reality, they are off by as much as 20 or 30%. 

I have a B&K Dyna-Jet 707 that has been an exceptional companion for over 40 years.( Thank you Dad ! )   Have local vintage guitar/amp shop that will calibrate when asked.