Norman,
PR99 is a very versatile unit though it was marketed mainly to radio stations. It was used more as a playback unit rather than for recording. When I had mine I really liked it. The CCIR mod to PR99 is not a complex one I had planned on changing EQ on mine before I sold it. Also the PR99 had trouble calibrating for a +6 tape like the SM911 and Quantegy 456 the bias oscillators on it didn't put out enough current. That was the main reason I sold mine. That said it could be modded to bias those tapes and CCIR eq.
PR99 is a very versatile unit though it was marketed mainly to radio stations. It was used more as a playback unit rather than for recording. When I had mine I really liked it. The CCIR mod to PR99 is not a complex one I had planned on changing EQ on mine before I sold it. Also the PR99 had trouble calibrating for a +6 tape like the SM911 and Quantegy 456 the bias oscillators on it didn't put out enough current. That was the main reason I sold mine. That said it could be modded to bias those tapes and CCIR eq.

