Version 4 SHEET 1 880 680 WIRE 304 -512 -272 -512 WIRE -272 -384 -272 -512 WIRE -320 -336 -416 -336 WIRE -304 -240 -304 -288 WIRE -144 -240 -304 -240 WIRE -16 -240 -80 -240 WIRE 80 -240 -16 -240 WIRE -304 -208 -304 -240 WIRE 304 -112 304 -512 WIRE -416 -80 -416 -336 WIRE -304 -80 -304 -128 WIRE -304 -80 -416 -80 WIRE -304 -32 -304 -80 WIRE -544 16 -992 16 WIRE -480 16 -544 16 WIRE -352 16 -400 16 WIRE -544 176 -544 16 WIRE -992 192 -992 16 WIRE -336 192 -336 64 WIRE -16 192 -16 -240 WIRE -992 352 -992 272 WIRE -544 352 -544 256 WIRE -544 352 -992 352 WIRE -336 352 -336 272 WIRE -336 352 -544 352 WIRE -16 352 -16 272 WIRE -16 352 -336 352 WIRE 304 352 304 -32 WIRE 304 352 -16 352 FLAG 304 352 0 FLAG 80 -240 Output IOPIN 80 -240 Out SYMBOL voltage 304 -128 R0 WINDOW 123 0 0 Left 2 WINDOW 39 24 132 Left 2 SYMATTR InstName V1 SYMATTR Value 350V SYMBOL voltage -992 176 R0 WINDOW 123 15 157 Left 2 WINDOW 39 24 132 Left 2 SYMATTR Value2 AC 1 0 SYMATTR InstName V2 SYMATTR Value SINE(0 5.5V 1K) SYMBOL Misc\\triode_dd -304 16 R0 WINDOW 38 13 -75 Left 2 WINDOW 0 33 -47 Left 2 SYMATTR SpiceModel 12AT7_ECC81 SYMATTR InstName U1 SYMBOL Misc\\triode_dd -272 -336 R0 WINDOW 38 8 -87 Left 2 SYMATTR SpiceModel 12AT7_ECC81 SYMATTR InstName U3 SYMBOL res -384 0 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 100R SYMBOL res -560 160 R0 SYMATTR InstName R4 SYMATTR Value 220K SYMBOL res -352 176 R0 SYMATTR InstName R1 SYMATTR Value 2K SYMBOL res -320 -224 R0 SYMATTR InstName R2 SYMATTR Value 1K9 SYMBOL res -32 176 R0 SYMATTR InstName R5 SYMATTR Value 220K SYMBOL cap -80 -256 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C1 SYMATTR Value 0.47µF TEXT -936 -136 Left 2 !.tran 0 10m 0 .1u TEXT -936 -176 Left 2 !;ac dec 50 10 50K