I had the center of an EL-34 come off in the amp. The tube is bad and not glowing at all. An idea's on how to get the black plastic center out of the tube socket ? Thanks
Pair of tweezers or a real small screwdriver to gently wiggle it out.
If the socket is not mounted on a circuit board it will (should)push through.
Pull the amp out of the headshell and remove that broken center .
Ever seen this happen? I was swapping out preamp tubes for fun a few years back, and the glass broke just as clean as could be right at the bottom of the rubber sleeve.