Hi Richard, its a longshot, but Rigonda did a test record for Stereo, sounds from Left then Right speaker plus a lot more, this was given with the Rigonda Bolshoi Stereo Radiogram, the one with motorised Tuning, that used to lock onto a station, it also had a pair of low watt, massive Loudspeaker cabinets with built in cross over units, a lot of people were unaware these units used ex russian service valves....regards....Alan.
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