I'm trying to understand the differences between the HP-113AR and 113BR "Frequency Divider and Clock." From the pictures, the AR lacks a front-panel BNC for the clock 'tick,' having only three BNCs instead of the four that the BR version has. Didier's site has a manual for the 113BR but I've not yet found one for the AR. There was a discussion here in 2007, in which a David Forbes of Tucson, AZ wrote that he had a 113AR manual. Any information or leads would be appreciated. Jeremy Sent from my iPad 4 -- Sent from my iPad 4.

Hi Jeremy: The HP Journal for Nov - Dec 1959 has the HP 113 AR as the cover feature. www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1959-11.pdf Photo of some HP T&F stuff including the 113 AR http://prc68.com/I/TF_rack.html -- Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html -------- Original Message -------- > I'm trying to understand the differences between the HP-113AR and 113BR > "Frequency Divider and Clock." From the pictures, the AR lacks a > front-panel BNC for the clock 'tick,' having only three BNCs instead of the > four that the BR version has. Didier's site has a manual for the 113BR but > I've not yet found one for the AR. There was a discussion here in 2007, in > which a David Forbes of Tucson, AZ wrote that he had a 113AR manual. Any > information or leads would be appreciated. > > Jeremy > > Sent from my iPad 4