After 1991 or so, most of the major brands of servos became compatible with each other. You can use any of these brands of servos with any brand of receiver.
You can mix Futaba servos with an Airtronics receiver, mix Hitec & JR servos with a Futaba receiver, etc. Somewhere along the line, the wiring didn’t become compatible. For Futaba, Hitec, and JR Radio, the servo and battery connections have the right polarity and signal wires, although the connectors are physically different. You can’t reverse the direction of a servo (reversed servo) by swapping (+) and (-). If you do, you’ll burn out either the servo or the receiver or both.
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