Abe,
It's a Switchcraft 14B, available from many sources.
Here's the "for sure" real thing :
http://www.vintagevibe.com/p-601-headphone-jack.aspx
Like a lot of components, over the years it may have oxidized, gotten "gummed up", or simply been "knocked about" from use and tinkering.
With all those wires attached to it (as its mounted in the amp),
it can be a pretty fussy (but plenty do-able) job to replace it.
So, before you order a new one and swap it out,
get in there and carefully scour the points on it where the 1/4" plug makes contact - the sleeve (inside the main barrel, or cylinder) and the two "arms". Just use a small file, emery cloth (fine sandpaper), or anything that will gently but thoroughly scrape the metal at the point(s) of contact back to its original "shiney" condition. At the same time, a shot of contact cleaner goes a long way to improve your results.
ALSO - look very closely, and make sure that none of the exposed wire ends soldered to the leads are touching and shorting each other. If they are, just gently pry them apart with a small screwdriver or needle-nose pliers.
It's a Switchcraft 14B, available from many sources.
Here's the "for sure" real thing :
http://www.vintagevibe.com/p-601-headphone-jack.aspx
Like a lot of components, over the years it may have oxidized, gotten "gummed up", or simply been "knocked about" from use and tinkering.
With all those wires attached to it (as its mounted in the amp),
it can be a pretty fussy (but plenty do-able) job to replace it.
So, before you order a new one and swap it out,
get in there and carefully scour the points on it where the 1/4" plug makes contact - the sleeve (inside the main barrel, or cylinder) and the two "arms". Just use a small file, emery cloth (fine sandpaper), or anything that will gently but thoroughly scrape the metal at the point(s) of contact back to its original "shiney" condition. At the same time, a shot of contact cleaner goes a long way to improve your results.
ALSO - look very closely, and make sure that none of the exposed wire ends soldered to the leads are touching and shorting each other. If they are, just gently pry them apart with a small screwdriver or needle-nose pliers.