I never hear anything on forums regrading the original Castle Acoustics Ltd loudspeaker company! Castle were the first ever speaker i heard, The 'Howard Mk.I' /Thorens TD160 Super/ Mayware 'Formula 4, Mk.3'/ ADC '26'/Quantum Electronics '102'/'207DA' are what first turned me on to real Hi-Fi.. I've gone thru a lot of changes but always end up back to sq one..... I think i'll probly live forever with my Mk.I 'Conway' & 'Richmonds'... Absolutly fantastic speekahs