Hi all, I have the following modules from a HP 5061A cesium standard available free for the cost of shipping from Melbourne, Australia A1 Synthesizer A3 Multiplier A8 Phase detector A9 Operational amplifier (the one with the brick module in it) A13 Buffer amplifier A15 Power regulator PCB Interested? Send me an email at vilgotch1(at)gmaildotcom Thanks, Morris