Version 4
SHEET 1 880 680
WIRE 720 -240 240 -240
WIRE 240 -176 240 -240
WIRE 240 144 240 -96
WIRE 240 192 240 144
WIRE 720 208 720 -240
WIRE -64 240 -112 240
WIRE 16 240 -64 240
WIRE 160 240 96 240
WIRE 192 240 160 240
WIRE 208 336 208 288
WIRE 208 352 208 336
WIRE -112 368 -112 240
WIRE -112 512 -112 448
WIRE 208 512 208 432
WIRE 208 512 -112 512
WIRE 720 512 720 288
WIRE 720 512 208 512
WIRE 208 576 208 512
FLAG 208 576 0
FLAG 208 336 k
FLAG 240 144 a
FLAG 160 240 g
FLAG -64 240 in
SYMBOL Misc\\triode 240 240 R0
SYMATTR InstName U1
SYMATTR Value ECC82
SYMBOL Misc\\EuropeanResistor 192 336 R0
SYMATTR InstName R1
SYMATTR Value 2K2
SYMBOL Misc\\EuropeanResistor 112 224 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 10K
SYMBOL Misc\\EuropeanResistor 224 -192 R0
SYMATTR InstName R3
SYMATTR Value 680K
SYMBOL voltage 720 192 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 250
SYMBOL voltage -112 352 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value SINE(0 0.2 1K)
TEXT -200 560 Left 2 !.inc koren_tubes.cir
TEXT -200 584 Left 2 !.tran 0 10m 2m 50µ