Not going to give a blow-by-blow how-to, but: If you don't understand the instructions or you don't feel comfortable doing it, take the amp to a competent tech. If you measure any volts, stop! Something is wrong and you have screwed something up and your amp is dangerous. If you did everything right, you will measure zero volts AC. Turn the amp on and measure the voltage between the chassis and the ground at the electrical outlet. Test your work by plugging in the amp to your new 3-wire grounded plug. You also have to find the "death capacitor" and clip it out and remove it. The ground wired should be crimped to an eyelet terminal and then bolted to the amp so it makes a good solid electrical connection to the chassis. The hot wire connects to the amp fuse holder, and the neutral wire connects to the switch. Look at your new three-prong plug and determine which wire is hot and which is neutral. Yes you should discharge the filter caps, yes you should keep one hand in your pocket, yes you should only reach inside with a chopstick, yes you should unplug the amp first. Use one of the transformer mounting screws, crimp on a ring or u connector to the green wire, and screw it down with a lock washer. Unused terminal strip is preferable.ĥ) Green lead from the new cord goes to chassis ground. Either find a lug on a terminal strip that isn't being used (and doesn't connect to the chassis) and use that, or just twist and solder them together and insulate well with electrical tape. If you use a new wire for this part, make sure you remove the wire that goes from the fuse tip to chassis ground.Ĥ) White lead from the new cord gets soldered directly to the transformer lead that is currently going to the tip side of the fuse holder. If the one that currently goes to chassis ground is long enough you could leave the side currently connected to the fuse holder and just move the other end from the chassis ground to the switch lug. But if you need a length of wire to accomplish step 3, you could use a section of the old power cord.ġ) Black wire on new cord goes to the sleeve side of the fuse holder (nearest to the chassis edge).Ģ) Clip out that brown cap that goes from the fuse sleeve to ground.ģ) New wire from the fuse holder tip to the side of the switch currently connected to the power cord. Obviously the new cord gets pulled out and discarded. Does the other one sneak around the back and go to a chassis ground? I see one black wire coming off the tip side of the fuse holder that obviously goes to a transformer lead. The steps below basically use the same procedure but omit routing the power through the ground switch (ground switch here that I can see). DISCLAIMER: I'm not a tech, I'm a hobbyist, but I've done this kind of thing plenty of times on vintage Fenders.
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