Version 4
SHEET 1 880 680
WIRE 240 -64 192 -64
WIRE 480 -64 240 -64
WIRE 192 -48 192 -64
WIRE 192 64 192 32
WIRE 192 112 192 64
WIRE 144 160 -112 160
WIRE 160 272 160 208
WIRE -112 288 -112 160
WIRE 160 288 160 272
WIRE 480 288 480 -64
WIRE -112 416 -112 368
WIRE 160 416 160 368
WIRE 160 416 -112 416
WIRE 480 416 480 368
WIRE 480 416 160 416
WIRE -112 432 -112 416
FLAG -112 432 0
FLAG 240 -64 235VDC
FLAG 160 272 Uk
FLAG 192 64 Ua
SYMBOL Misc\\EuropeanResistor 144 272 R0
SYMATTR InstName R1
SYMATTR Value 4K7
SYMBOL Misc\\EuropeanResistor 176 -64 R0
SYMATTR InstName R2
SYMATTR Value 220K
SYMBOL Misc\\triode 192 160 R0
SYMATTR InstName U1
SYMATTR Value 12AU7
SYMBOL voltage -112 272 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value SINE(0 200m 1k 0)
SYMBOL voltage 480 272 R0
WINDOW 123 0 0 Left 2
WINDOW 39 24 124 Left 2
SYMATTR InstName V2
SYMATTR Value 235
TEXT -112 136 Left 2 ;1KHz 200mVpp
TEXT 488 240 Left 2 ;235VDC
TEXT -128 504 Left 2 !.INC Koren_Tubes.cir
TEXT -128 536 Left 2 !.tran 0 10m 0 1u
TEXT -128 600 Left 2 !.four 1k V(Ua)
TEXT -128 568 Left 2 !.options plotwinsize=0
TEXT 184 568 Left 2 ;THD result:\nView -> SPICE Error Log