580 Series plug-in interface

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The plug-in interface of the 580 series scopes is a single 16-pin Amphenol connector:

Pin Function Comment
1 -150 V R-C decoupled from mainframe
2 +100 V R-C decoupled from mainframe
3 +225 V R-C decoupled from mainframe
4 +350 V R-C decoupled from mainframe
5 6.3 VAC heater from dedicated winding on mains transformer
6 6.3 VAC heater return for pin 5
7 Alternate-trace sync pulse from timebase
8 not connected  
9 Vertical signal input 93 Ω impedance
10 Ground  
11 /Vertical signal input 93 Ω impedance
12 117 VAC from primary side of mains transformer
13 117 VAC return for pin 12
14 Vertical signal input return 93 Ω, terminated and biased in plug-in, galvanically connected to pin 9
15 +12.6 V from regulated heater supply
16 /Vertical signal input return 93 Ω, terminated and biased in plug-in, galvanically connected to pin 11