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Has anybody installed a passive effects loop? If yes, where did you insert the loop? Any changes to resistors required?

A passive effects loop is a circuit that allows a user to insert effects pedals into the signal chain of an amplifier. While it is possible to install a passive effects loop, it will require some knowledge of circuit design and soldering. The loop is typically inserted between the preamp and power amp sections of the amplifier. The specific location will vary depending on the amplifier circuit. As for the resistors, it will depend on the specific design of the passive effects loop being installed, but in general, it may require the addition or modification of resistors in order to properly match the impedance of the effects pedals and the amplifier. It is always best to consult the instructions or a professional before making any changes to the amplifier circuit.