[time-nuts] HP 115BR Clock 60 Hz output option

[John Vendely]

The HP 115BR clock was available with an optional 60 Hz output. The 
service manual mentions the option but provides no schematic. My 115BR 
has the 60 Hz output option (a front-panel placard reads "Specif. H08 
115R), and after running it for over 30 years, I'm finally getting 
around to using it to drive a synchronous motor clock via a small 
class-D power amp and step-up transformer. However, the 60 Hz output 
level is very low, around 60 mV p-p, and somewhat distorted.  I doubt HP 
designed it that way.  Before going to the trouble of 
reverse-engineering it, I thought I'd check to see if anyone has seen a 
schematic or other information on this option?

Many Thanks,

John