tube testing newb

[Patrick620]

On an 80 rectifier tube I should be getting two plate readings, correct? I'm using a Precision Instruments 920 tube tester and I only get a reading on one of the two tests for this tube. I got the identical readings on another 80 tube. I dont have a working radio to see if they actually work or not. The button that I have to push on the tester for the plate 2 test works on other tubes so I dont think its the tester. The readings are well into the "good" section on plate one and nothing at all on plate two. The tube filaments are lit.