Just received the expert's response, i.e., Jimmy Koh, "Bronica made two types TTL light meter, older type using two 1.5 volt battery, newer type using one 6 volt px28 battery same as camera body battery." I am amazed at is FAST reply to my email, especially given Hurricane Sandy and its continuing aftermath.
Jimmy Koh definitely has my future business on my Bronica Cameras. Jon