Updated January 8, 2020
I purchased a Hickok 800 tube tester at an estate sale in the Fall of 2017. In looking for documentation I found Stan Saeger’s “Consolidated Test Data For Hickok Model 533A-600A-605A Tube Testers” pdf file. (Sadly Stan passed away on August 14, 2019) It’s my understanding the Hickok 600A tube test data also applies to the 800 and 800A models.