SVT's are very powerfull and viabrate excessively. After all 6-6550's at 700 volts will viabrate anything. I had one that backed the transformer lug off and it fell onto the power board and caused some damage so you may want to tighten those up while your in there. The front panel is seperate from the rear or main board on these and there is a clear cable shield that sends the voltage and signals wires to the other board. One wire is a green wire mounted to the front chassis and the other connectors easily pull off the headers. There are two preamp tubes on this board and they get real plate voltage so be careful there as it may not be discaharged. There are (I think) four screws that hold the preamp board on and you'll have to take all of the pot knobs off and screws to get it out. More than likely the solder joint on the input jack lug have wallered out so make sure that resoldering makes good contact with the pad and doesn't pull away. Put it back together and your done. Good luck !