@Vernon Barry posted:Agreed, Williams 6A reverse board- note a version without reverse lockout switch.
The sound card either is a Williams True Blast II or a copy of one. I think they added the MTH style connector for speaker to possibly connect to an existing MTH speaker.
This is the first version of the Tru-blast 2. Subsequent versions used a die instead of an IC. It was built by Techno-mind of China for TAS, who was the designer of the board.
Lou N