I've owned 2 pairs of the RT-1's. Serial numbers 0011 and 12, and 021 and 022 as far as I recall. I think Stewart only made about a dozen pairs of these. ATC Studio bass unit, KEF large magnet B200 in an open backed section for midrange, and the Decca Kelly DK30 for treble. I still have one fully working pair. As well as all the component parts from the second pair. Properly balanced speakers. By far the best treble I have EVER heard, including ATCs, Sonus Faber and Focals. With one pair, at one point, I removed the crossovers, built an external active Elektor 3-way crossover, and used it with 3 sets of Leak valve amps (2x TL10, 2 x Stereo20), and also tried it with 2 pairs of Stereo20 valve amps and a Naim NAP160 for bass. Fantastic in all cases. This was in a 20ft square room. I now have huge ATC active SCM150ASLTs with Townshend Supertweeters but these particular Celefs gave me just as much clout, finesse and enjoyment for nearly 30 years.
