Version 4
SHEET 1 1124 760
WIRE 368 -144 304 -144
WIRE 480 -144 368 -144
WIRE 640 -144 560 -144
WIRE 720 -144 640 -144
WIRE 896 -144 800 -144
WIRE 944 -144 896 -144
WIRE 432 -16 80 -16
WIRE 1056 -16 512 -16
WIRE 304 64 304 -144
WIRE 944 64 944 -144
WIRE 384 112 352 112
WIRE 496 112 464 112
WIRE 768 112 496 112
WIRE 896 112 848 112
WIRE 80 128 80 -16
WIRE 176 128 80 128
WIRE 256 128 176 128
WIRE 1024 128 992 128
WIRE 1056 128 1056 -16
WIRE 1056 128 1024 128
WIRE 272 224 272 176
WIRE 368 224 272 224
WIRE 416 224 368 224
WIRE 976 224 976 176
WIRE 976 224 416 224
WIRE 80 240 80 128
WIRE 496 240 496 112
WIRE 640 240 640 -144
WIRE 272 256 272 224
WIRE 1056 256 1056 128
WIRE 368 272 368 224
WIRE 80 400 80 320
WIRE 272 400 272 336
WIRE 272 400 80 400
WIRE 368 400 368 336
WIRE 368 400 272 400
WIRE 496 400 496 320
WIRE 496 400 368 400
WIRE 640 400 640 320
WIRE 640 400 496 400
WIRE 1056 400 1056 336
WIRE 1056 400 640 400
WIRE 640 464 640 400
FLAG 640 464 0
FLAG 368 -144 a1
FLAG 896 -144 a2
FLAG 416 224 k
FLAG 176 128 g1U1
FLAG 1024 128 g1U2
SYMBOL Misc\\tetrode 304 112 R0
SYMATTR InstName U1
SYMATTR Value EL84
SYMBOL voltage 640 224 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 320
SYMBOL voltage 528 -16 R90
WINDOW 123 0 0 Left 2
WINDOW 39 580 786 Left 2
WINDOW 3 591 43 VRight 2
SYMATTR Value PULSE(-18 18 0 0.5m 0.5m 0 1m 100)
SYMATTR InstName V2
SYMBOL voltage 496 224 R0
WINDOW 123 0 0 Left 2
WINDOW 39 24 124 Left 2
SYMATTR SpiceLine Rser=0
SYMATTR InstName V3
SYMATTR Value 275
SYMBOL Misc\\tetrode 944 112 M0
SYMATTR InstName U2
SYMATTR Value EL84
SYMBOL res 576 -160 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 10
SYMBOL res 816 -160 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 10
SYMBOL Misc\\EuropeanResistor 64 224 R0
SYMATTR InstName R3
SYMATTR Value 22K
SYMBOL Misc\\EuropeanResistor 1040 240 R0
SYMATTR InstName R4
SYMATTR Value 22K
SYMBOL Misc\\EuropeanResistor 256 240 R0
SYMATTR InstName R5
SYMATTR Value {x}
SYMBOL cap 352 272 R0
SYMATTR InstName C1
SYMATTR Value 10µ
SYMBOL Misc\\EuropeanResistor 864 96 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 100
SYMBOL Misc\\EuropeanResistor 480 96 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 100
TEXT 72 528 Left 2 !.tran 0 20m 15m
TEXT 72 480 Left 2 !.inc Koren_Tubes.cir
TEXT 72 440 Left 2 !.step param x 100 180