Tube tester...anyone own their own?

If you want a general idea if your tubes are good or bad and are reasonably matched get a home grade Hickock or TV-7DU for a few hundred $. You will not get repeatable results from these testers. Each time you test a tube you will get somewhat different results.

FWIW I haven’t found that to be the case with my Hickok 800A. In fact on a number of occasions I’ve recorded measurements of a given tube, then repeated the measurements after many months of light to moderate use, and obtained essentially the same results.

I’m very careful, of course, to set the "Line Adjust" and other adjustments on the machine ("Bias" and "English") accurately, and to allow both the tester (which contains one or more tubes) and the tube under test a sufficient amount of time for warmup.

Best regards,
-- Al

Al, thanks for your experience. What do you mean by essentially? I mean that you may not get a radical difference but you won’t get the same reading either.

I’ve been told by Roger Kennedy that the spec for a new (and there aren’t any new ones anymore), calibrated Hickock home type tester for Gm is +/- 15% That means that two testers both within spec can have a 30% difference measuring the same tube, worst case.

It’s also necessary to remember that most of these testers contain tubes inside the box with no ventilation, so how long the tester has been on affects the results. I’ve been told to never leave them on for more than an hour.

The Maxi-preamp 2 tester has an adapter for testing 6DJ8 family tubes but it still has the problem of the tube overloading the tester.

@mofimadness  That's an interesting option. Any idea as to what that sells for? Also, I wonder how accurate that Orange unit will be with power tubes? 
A few years back, I took an ARC amp to a local tech who tested the 6550's that the amp utilized. I thoughts something was wrong as the amp was noisy in one channel...and the tubes were not new. He tested the 6550's on his Hickok and pronounced them healthy. Turns out that they were anything but, so after a near melt down..and a full tube replacement, the noisy channel issue was solved. 
Since I am now using KT150's in my amps, I would like suggestions as to an amp tester ( besides the pricey Amplitrex..which I am sure is excellent!) that can accurately test these tubes.

That’s an interesting option. Any idea as to what that sells for?

The Orange VT-1000 is just $499. Don’t think it will do KT150’s.

https://www.musiciansfriend.com/accessories/orange-amplifiers-tube-tester/h98876000000000?cntry=us&source=3WWRWXGP&gclid=CjwKCAiAsIDxBRAsEiwAV76N83ueGIGLr843otcNeglry7GEf-AZRw-SLY-FGxZ2K46f1RfIWfs5DBoCjKgQAvD_BwE