Why 'TRK' you are correct! It was 'N6' ........ 'W6' was the OTHER 'entertainer' on the '435' repeater! He spoke slowly ..... and it took him two tries to ID! Of course - "ID's" were a formality back in the day. All those numbers and letters confused people!
I wonder if Arny Gamson the one and only K6PXA is still alive? He was in Vegas and then disappeared. He "loved" Riley a lot!