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Apr 26, 2016 Take the rod piezo out of the pre-amp packaging. Using wire cutters, cut off the rod piezo pickup from its wire. Cut closest to the pickup, leaving the longest length of wire possible. Pull back the ground wire sheath to expose the lead wire. Strip off 1/4-inch of the lead wires insulation. Also go to the tdpri.com DIY Amplifier Forum and look at similar amp builds. These amp build instructions from StewMac are very good: StewMac15WattBuildinstructions WARNING: A tube amplifier chassis contains lethal high voltage even when unplugged -sometimes over 700 volts AC and 500 volts DC.
As I said before it's the coil we're after. This can be tricky to get to without damaging the wiring inside!
First of all we need to identify the pins we'll be using as outputs for our pickup. This will be the two, as shown above, which will be on their own away from the main cluster of pins. You need to be careful with these two pins.
Depending on the way you're relay has been produced will determine how to proceed.
If the relay, as above, had a cover with clips simply remove the cover.
If it's glued, using a knife remove the top of the relay. This will make it easier to cut away the sides without damaging the components within.
I then carefully used a hack saw to cut the relay in half.
Once you have done this you can remove the thin metal cover over the top of the coil. This is the part that moves up and down when the electromagnet is switched on/off. Do not try to remove the centre core of the coil.
You're coil should now look a little like picture 2 above. Do not remove the pins attached to the coil. These pins are attached to either end of the coil and make it much easier to wire it to the audio jack.
First of all we need to identify the pins we'll be using as outputs for our pickup. This will be the two, as shown above, which will be on their own away from the main cluster of pins. You need to be careful with these two pins.
Depending on the way you're relay has been produced will determine how to proceed.
If the relay, as above, had a cover with clips simply remove the cover.
If it's glued, using a knife remove the top of the relay. This will make it easier to cut away the sides without damaging the components within.
I then carefully used a hack saw to cut the relay in half.
Once you have done this you can remove the thin metal cover over the top of the coil. This is the part that moves up and down when the electromagnet is switched on/off. Do not try to remove the centre core of the coil.
You're coil should now look a little like picture 2 above. Do not remove the pins attached to the coil. These pins are attached to either end of the coil and make it much easier to wire it to the audio jack.