Jeff's idea is excellent -- there are also purpose-made headphone amps, but good ones start closer to $200 and shoot way on up. A good quality used stereo pre-amp with headphone jack would be cheaper and very comparable to those headphone amps (albeit a bit bigger). When you go to connect it, you may want to keep one thing in mind: both the zone 2 output and the tape output are pure analog outputs -- they will not pass a digital input. You'll want to toss in analog interconnects for any source you plan to listen to with headphones.

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