Learning to wire an input jack on your guitar amplifier can save you the cost of asking a professional technician to sort it out. Guitar amplifiers' input jacks are the primary point of connection between the guitar and the amplifier; if a connection comes loose, the amp won't be able to receive the signal from your guitar. Amplifier wiring can seem like a daunting task, but with clear instruction it is a skill that almost anybody with sufficient confidence can learn. You can access the input jack from the back of the amplifier.
- Skill level:
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Things you need
- 1M resistor
- 14cm shielded wire
- Wire cutter
Remove the input jack from the chassis by unscrewing the nut on the outside and pulling the jack through. Note that the input jack has four terminals. Orient the input jack so that the input hole is pointing away from you. The bottom right terminal is Terminal 1 and the others are numbered sequentially, working clockwise from it. Connect the resistor to Terminals 1 and 4 so that its body is between the two terminals. Bend the wires around so that the resistor stays in place but isn't soldered. Leave the long resistor wire poking through the hole of Terminal 4.
Bend the resistor's long wire around so that after going through Terminal 4 it finishes at Terminal 2. Bend the end around a little to root the resistor in place. Strip the end of one of the wires inside the shielded wire to expose the bare shield. Twist the various metallic strands together to form a single metal wire. The two wires are still insulated from each other.
Solder the still-insulated inner wire to Terminal 1 of the input jack. This should sit in the same terminal as the shorter arm of the resistor. Solder the exposed inner wire to Terminal 4 on the input jack.
Locate the "C1" and "R3" sections of the turret board (see References for diagram). The turret board has a row of resistors running along the top edge and two resistors in the top right corner. Turn your board so you're viewing it this way. Find the resistor and capacitor in the bottom left corner of the board and locate the wire coming from them.
Strip the end of this wire using the wire cutter. Connect this exposed end to Terminal 2 on the input jack. Solder all of the wires in place to complete the circuit.
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