Fellow Volt-Nuts, I have in my possession a couple of Julie Research Labs ZVR-506 6V zener references that came out of some gear that was manufacturer in the 1970's. I have not been able to find detailed information on them only generalised specifications. Does anyone have and detailed information on the pin connections. It is a small cube 7/8 inch and uses a 9 pins on the base that fit a standard valve type socket. Thanks, Steve Grady Sydney Australia