Thank you both! I really appreciate it.
One additional question related to incompatibility of tuners and amp - are can deck from FH-15R be connected to FH150R? Even FH-11 has identically looking deck, so if I get in position to pick elements, and that is very likely, can I be peaceful about the way how deck is connected on amplifier on FH-11, FH-15R and FH-150R?
Now, all of you collectors will find this interesting - the guy who answered my ad for FH is an audiophile, and as such doesn't values or has the need for FH series, BUT, as he said himself "I've bought them to get the boxes". So, he has pile of FH systems, bought just to get speakers from them! Must be one of the strangest reasons why someone made a collection. Fortunately, he now owns hi-end HI-FI units, and obviously doesn't need the FHs anymore
BTW, if all FH-15R and FH-150R in his possession are preserved similarly, I'll go for FH-150R, and not because of the AMFB bass, or connectors, but because of LED lightning on equalizer
I'm serious, the quantity of LED just became a deciding factor
P.S. Of-course, I'll share what he has left for sale, and give you contact details after I pick the one for me.