Recommendations for a vacum tube tester

Yes it is a great tool.   I’m not home tonight but I will check my manuals and let you know if there is a specific set of values.  I am guessing the switches would be set the same , but not sure what the target is for KT77

 From what i read it is the average of what a new testing tube should test.  Tubes can go higher or lower but no more than 30% lower than that number to be considered good.  Sound right or not?  Thanks

@tksteingraber If the tube does not meet the minimum reading as indicated in the tube tester chart, it is reject. None of this 30% lower thing. Wherever you read that, its incorrect.

@atmasphere thank you for your input. The reason I asked is that the number listed on the Hickok chart does not appear to be the min and I read it was what an average new tube should test at and I wanted to verify that with experienced Hickok testers. An example…the 12at7 is listed at 4000 on the chart which is in the middle of good on the meter and replace begins at 2600 (65%) on the meter, 12au7 is listed at 2200 and replace begins at 1300 (60%). 12ax7 is listed at 1250 and is too low to follow the gm meter good/replace readings and needs to use the good-bad test by adjusting the english down. I do realize these calibrated testers results are approximate and not real accurate but good for determining if and how good a tube might be. Just learning here!

BALANCE Controls, especially using tube equipment! Remote Balance a wonderful thing. A very small balance tweak can make a surprising amount of difference.

The tester just proved it’s usefulness. Bought a pair of new, nos, matched tubes from Viva Tubes. Visually did not appear new? So I tested them. One tested replace and second one tested just barely good. Also, the tubes were 25% different and were nowhere near matched. Contacted seller and they said their tubes were fine and that old testers are unreliable and can’t compare to modern ones they used. Told me to try them and they will play fine. The boxes had results (different scale) written on them with gm results 30% apart. Their results even confirmed the tubes were not matched. Blame the buyer anyway. Returned them and Viva Tubes is a do not buy from seller.