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> Keithley 616 digital electrometer multimeter
Keithley 616 digital electrometer multimeter
Keithley 616 Digital Electrometer Multimeter
You are looking at a Keithley 616 digital electrometer. It powers up, all the LED segments are good and it records voltage input. No further testing was done. Some of the screws are a bit rusty. No cables are included.
All of my testing is done on a calibrated Jackson 648s Dynamic Tube Tester. I own several other testers including Hickok and military tube testers. None of the other testers compare to the elegant simplicity of the Jackson. The Jackson works very well and is incredibly easy to operate. I often re-check calibration and perform sanity checks using several tube testers to ensure the quality of my testing. Still, the tubes I sell are decades old and testing is not an exact science. My intention is to sell you a good, working tube. My tube strength comments are derived from the readout on my tube tester. It is possible that because of human or machine error a tube you purchased will not work correctly. Please contact me if you are having trouble with a tube you purchased. For more information on how tube testers work, as well as the pitfalls of tube testing, go to this very helpful link: http://tone-lizard.com/Tube_Testers.html
