motorola vt71 ts4j 3rd if issue- it wont light

[bandersen]

Originally Posted by kramden66

So if pin 3 & 4 are shorter that is the problem? If you pull the tube everything stays lit so it is making the series still work so must be something odd. Its not a wafer socket but one of those light brown or tan plastic type sockets.

Yes, pins 3 and 4 are the filament. They must be shorted otherwise the other tubes could not be lit up with that tube pulled out.