What Rejuv addapter works for a 7400 Tube?

rmackie6661

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Hye all I am in need of a Addapter for a Wells K2774 tube the blue according to my Rejuv is gone but I'm testing it on a CR23 addapter and can't clean/or rejuv it with that one. anyone have a pinout or info on which addapter I need. I can't get the tube number til thurs.
Tested all teh transistors and even swapped in a different neck board and still no blue. gotta be the blue cathode gun.
 
rejuve

Sometimes that happens. It just wont rejuve it as it is probably a "open circuit" inside.
Think of it as a spark plug. Sometimes parts burn off or open up.
 
Does the 470 have a HIGH setting? I know the 467 and the 490 does. If so, try it that way...
 
Ross, I've got a 490 on my bench you could shoot it with if you wanted to bring the tube with you when you drop off that cab....
 
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