Keithley 151 Instruction Manual page 18

REPLACEABLE PARTS LIST - MODEL
15L
Circuit
I~
f
Desig. Dercription
Part NO.
Ef=fi
V-l - Vacuum Tube
EV &3iM &I=24
v-2 6 Vicuum Tube EV ?%F
v-3
v-4
same ** v-2
l&AT7 Vacuum Tube
EV 12-AT7
VI-6 0564R