15GP22 needs a ride Indy to Windy City

[ohohyodafarted]

Yes, tapping did not cause the filiment to re-connect.

I put it on the Beltron.

Cleaning method first.

Red gun came up to .20 ma cleaning light never came on
Green gun cam up to .75ma cleaning light came on very dimly at full voltage

Life test sucked big time on both guns.

Then I did the restoring method.

It acted very curious. Restoring current never came up as you usually expect to see but at full voltage I got the blue lights to flash and I hit the interupt button, and proceed with this 3 times as recomended in the manual. After the 3rd sequence I went back to test mode.

Red and Green guns both now reading about .25ma. I think the restoring method wiped out what little cathode material that was left.

So there you have it. This 15G is officially good for shit, and beyond all help except for a rebuild. This tube will be going into the oven on our next trip to Hawkeye along with one of John Folsoms bulbs. I am also going to rebuild an early production 21AXP22 which is still under vacuum, that goes into my 21ct55 at that time.