Oh, you don't want it. It is terrible and junk. Oh, I have a question for your friend could you give me his name and #. Search here and also in the equipment review section for my comments on mine and others comments. Things to look for - do all the capacitive switches work? Also, the loudness and tone control circuits of the preamp had problems in early production run so check to see they are right. All units run cool. The tuner should be about as good as you've heard and in terms of sensitivity in both am and fm. No turn on thumps. If the meters do not lie at zero (nil), with power on but no signal, don't fret there is an adjustment a tech can handle easily. At wide open through phono and hi-level, with no signal, there should no almost no perceptible hiss (unless you're running K'horns). Channel balance throughout the volume control range should be dead even.
The circuit boards are wired using a computer like connector and depending on how the units have been treated may need cleaning.
Other questions - send me a private email and I'll try to help. The power amp or tuner in good working condition is worth the asking price. Considering the amp is 210 rms @ 8 ohms - that's what $.90 Cdn (about $.68/watt US). Can't go wrong. Heck, if you buy them and they are not blown and for any reason you don;t want them, I'd like a backup system.
Oh, model numbers:
Tuner 6731 (673 is the silver version)
Preamp 5721 (572 is silver faceplate)
Amp 5781 (578 is silver version).