7jp4 HK short

[timmy]

Ok update, I tried the 3 wires g1 g2 and a2 and move them around to different positions and that didn't fix it. I have 7 Motorola tvs with 7jp4 tubes in them and tested all of them with this bk440 only this one did not test right and I think I know why. The tube I have is new as it don't have tell tale signs of having been used including scrapes from the plug being put on and or pulled off. This tube is from 1956 from RCA original box and compared to another tube I have the gun is clearly different then the other I have so I'm thinking maybe the design was changed slightly from the earlier versions because I plugged it into a working set and this tube is infact nos if it had an HK short there would be lines and likely the brightness would not turn down. Perfect pic, focus , brightness super bright. If a change did happen in 1956 then it's the first 7jp4 that did not test on my tester all my others did.