Version 4
SHEET 1 880 680
WIRE 640 -64 256 -64
WIRE 256 0 256 -64
WIRE 256 112 256 80
WIRE 352 112 256 112
WIRE 256 160 256 112
WIRE 352 208 352 112
WIRE 352 208 304 208
WIRE 80 224 -16 224
WIRE 208 224 160 224
WIRE 640 256 640 -64
WIRE -16 352 -16 224
WIRE 224 416 224 272
WIRE -16 528 -16 432
WIRE 224 528 224 496
WIRE 224 528 -16 528
WIRE 640 528 640 336
WIRE 640 528 224 528
WIRE 640 560 640 528
FLAG 640 560 0
SYMBOL Misc\\tetrode 256 208 R0
SYMATTR InstName U1
SYMATTR Value EF95
SYMBOL Misc\\EuropeanResistor 240 -16 R0
SYMATTR InstName R1
SYMATTR Value 4700
SYMBOL voltage 640 240 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 60
SYMBOL Misc\\EuropeanResistor 208 400 R0
SYMATTR InstName R2
SYMATTR Value 200
SYMBOL voltage -16 336 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value SINE(0 0.1 1K)
SYMBOL Misc\\EuropeanResistor 176 208 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 12K
TEXT 256 568 Left 2 !.inc koren_tubes.cir
TEXT -50 588 Left 2 !.tran 0 50m 45m