Version 4
SHEET 1 880 680
WIRE 48 80 -144 80
WIRE 272 80 48 80
WIRE 368 96 144 96
WIRE 192 112 -64 112
WIRE -144 128 -144 80
WIRE 48 128 48 80
WIRE 272 128 272 80
WIRE 144 176 144 96
WIRE 144 176 96 176
WIRE 368 176 368 96
WIRE 368 176 320 176
WIRE -64 192 -64 112
WIRE 0 192 -64 192
WIRE 144 192 144 176
WIRE 192 192 192 112
WIRE 224 192 192 192
WIRE -64 208 -64 192
WIRE -144 304 -144 208
WIRE -64 304 -64 288
WIRE -64 304 -144 304
WIRE 16 304 16 240
WIRE 16 304 -64 304
WIRE 144 304 144 272
WIRE 144 304 16 304
WIRE 240 304 240 240
WIRE 240 304 144 304
WIRE 16 320 16 304
FLAG 16 320 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 -19 60 Left 0
SYMATTR InstName Vg2
SYMATTR Value 0
SYMBOL Valve\\Tetrode 48 176 R0
WINDOW 0 26 -51 Left 0
WINDOW 38 15 77 Center 0
SYMATTR InstName U1
SYMATTR SpiceModel 6DQ6A
SYMBOL Valve\\Tetrode 272 176 R0
WINDOW 38 12 77 Center 0
SYMATTR InstName U2
SYMATTR SpiceModel 6DQ6B
TEXT -160 360 Left 0 !.dc Vp 0 600 60 Vg2 50 200 25