If you don't then you can carefully unwind the pick-up until you find the break in the winding of the thin copper wire. You should have some resistance reading in one of the Ohms scales on the meter. If you have access to an ohms meter put it on the lowest ohms that you can get a reading from touching the beginning of the pick-up wire to the + and the other end of the winding on the pick-up wire to the (-). inspect the inside of the reverb tank to see if there are any wires that have come loose due to aging or vibration. The next culprit could be a faulty pick-up winding. So now that I see what it is you are talking about, I suspect it might be a bad tube, leaking electrolytic capacitor, corrosion on the RCA plug/socket terminal ( look into the female jack w/ a flashlight and see if it has a build-up of corrosion, if so then get a file in there and clean it up), it could be a shorted or open shield on the male rca plugs ( look to see if it is frayed, sometimes those old gray molded plugs crack where the plug meets the wire and can literally disconnect all of the mesh from the plug- which means no ground. Hey photobucket is easy.just read your post and uploaded this image from the web in less than 3 minutes