Version 4
SHEET 1 960 680
WIRE 368 32 112 32
WIRE 448 32 368 32
WIRE 112 64 112 32
WIRE 368 64 368 32
WIRE 448 144 448 32
WIRE 112 160 112 144
WIRE 272 208 208 208
WIRE 368 208 368 144
WIRE 368 208 352 208
WIRE 400 208 368 208
WIRE 208 288 208 208
WIRE 112 384 112 240
WIRE 208 384 208 368
WIRE 208 384 112 384
WIRE 448 384 448 240
WIRE 448 384 208 384
WIRE 112 416 112 384
FLAG 112 416 0
SYMBOL voltage 112 144 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL Misc\\EuropeanResistor 128 160 R180
WINDOW 0 31 76 Left 2
WINDOW 3 31 40 Left 2
SYMATTR InstName R2
SYMATTR Value 1
SYMBOL voltage 208 272 R0
WINDOW 0 24 96 Left 2
WINDOW 3 24 16 Left 2
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value {U}
SYMBOL njf 400 144 R0
SYMATTR InstName J1
SYMATTR Value J201
SYMBOL Misc\\EuropeanResistor 384 160 R180
WINDOW 0 31 76 Left 2
WINDOW 3 31 40 Left 2
SYMATTR InstName R1
SYMATTR Value 10e6
SYMBOL Misc\\EuropeanResistor 256 224 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R3
SYMATTR Value 1e6
TEXT 96 -120 Left 2 !.dc V1 0 40 0.1
TEXT 96 -160 Left 2 !.op
TEXT 96 -96 Left 2 !.inc 3055.tra
TEXT 96 -72 Left 2 !.inc Koren_Tubes.cir
TEXT 96 -48 Left 2 !.step param U list -1 -1.5 -2 -2.5 -3 -3.5 -4 -4.5