Wagner recording from 1926

Conversation just had with my father about a Wagner recording we both heard on Radio 3 yesterday morning (he is packing suitcases about to board a plane with my mother for Cornwall - Newquay Airport). It was an extract from a Wagner opera, live, conducted by Wagner's son, Siegfried. My father was telling me the voice I heard was that of a Russian bass. The voice reproduction was incredible. It really was incredible...As if this huge fellow were singing to me from the bathroom next door: a large, resonant voice, rich, mature, deep oak.