Testing tubes slow grid.

[Jimbo165]

I have a Sencore TC114 tube tester I have been using and when testing some tubes after letting tube warm up and testing it on emissions test they will show ok but when I switch to Grid test will stay in red bad zone then slowly move into Ok green . I mark on these tubes slow grid but have found that most of the time they will still work in radios or amplifiers but found to not use this tube in driver stage of tube amplifier . Should I not use these tubes when they test like this I do not want to cause any damage to my equipment . If I test grid first then switch to emission I never see them test slow and all looks ok. Any information will be appreciated. Thanks Jimbo

 

[wavrider]

Never seen that before on any of the tube testers I have.

You may want to look at schematic of your tube tester and see if there is any component that may be out of tolerance.

Also is it only certain tubes or do all tubes you test do this?

 

[Captain Kilowatt]

Never seen that before on any of the tube testers I have.

You may want to look at schematic of your tube tester and see if there is any component that may be out of tolerance.

Also is it only certain tubes or do all tubes you test do this?

I concur. I wonder if it has anything to do with voltages being switched inside the tester. Bad power supply components maybe?

 

[wavrider]

Maybe old filter cap. On power supply