Ok, the early (1980) HP-3580A manual list’s a single A11A1CR5 as that high voltage 7.5kV/10mA diode and A11A1CR1-4 as: 180V/200mA, for early serial number sets.
The 1987 revised 3580A manual lists A11A1CR1 and A11A1CR2 diode’s as 7kV/50mA. Confused yet?
The associated caps also get changed, three 1kV caps (C1=.001, C2,C3 =.01uF) and three (4700pF=.0047uF) 4kV caps in the early sets, but six 4700pF/4kV caps in later serial number sets. So now I say
I suspect my set is later than either manual because it has the red leds readout instead of the mechanical geared unit. Anybody have data from a manual later than 1987 with better information?
Steven