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Hi, are these the PCATs tuners, or original Empeg tuners, or something else?

PCATS unassembled tuner kits

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What's the difference between the "complete kits" and the "tuner modules"?

"Tuner modules" refers to the actual electronic component that receives radio transmissions inside the tuner kit. It's reasonably useless without the rest of the kit.

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Are any of them assembled and ready to use, or will they all require soldering/assembling?

Assembly would be required.
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-Rob Riccardelli
80GB 16MB MK2 090000736