Version 4
SHEET 1 880 680
WIRE 48 112 -144 112
WIRE -144 128 -144 112
WIRE 48 128 48 112
WIRE 144 176 96 176
WIRE 0 192 -64 192
WIRE 144 192 144 176
WIRE -64 208 -64 192
WIRE 16 272 16 240
WIRE 48 272 16 272
WIRE 48 288 48 272
WIRE -144 304 -144 208
WIRE -64 304 -64 288
WIRE -64 304 -144 304
WIRE 16 304 16 272
WIRE 16 304 -64 304
WIRE 144 304 144 272
WIRE 144 304 16 304
FLAG 48 288 0
SYMBOL voltage -144 112 R0
WINDOW 0 -16 57 Left 0
SYMATTR InstName Vp
SYMATTR Value 0
SYMBOL voltage -64 192 R0
WINDOW 0 -18 61 Left 0
SYMATTR InstName Vg1
SYMATTR Value 0
SYMBOL voltage 144 176 R0
WINDOW 0 -29 -15 Left 0
WINDOW 3 -20 60 Left 0
SYMATTR InstName Vg2
SYMATTR Value 150
SYMBOL Valve\\Tetrode 48 176 R0
WINDOW 0 -75 -44 Left 0
SYMATTR InstName U1
SYMATTR SpiceModel 6L6
TEXT -144 320 Left 0 !.dc Vp 0 500 50 Vg1 0 -40 5