I picked up this tube tester as a trade for refurbishing an amplifier and a tuner. The history of this tube tester is that it was used by P & G (Proctor and Gamble) and then surplussed out some years ago. The case shows some wear, but the deck and electronics appear to be in excellent shape. The original power cord is still in excellent condition. I checked the calibration and it was spot on and didn’t require any adjustments. This is a very nice tube tester that doesn’t appear to have seen much use.
The 6000A is a compact unit that tests the newer tubes like Compactrons and does not test the older 4, 5, and 7 pin tubes. I use this tube tester as my everyday tester for newer style tubes.
I especially like the shorts indicators. With a quick glance you can see if there are any shorts before testing the tube for quality.