Version 4
SHEET 1 880 768
WIRE -272 96 -272 128
WIRE -144 128 -272 128
WIRE -128 320 -128 304
WIRE -128 224 -128 208
WIRE -272 272 -272 240
WIRE -272 240 -336 240
WIRE -272 240 -272 224
WIRE -336 240 -336 48
WIRE -336 48 -288 48
WIRE -240 -48 -176 -48
WIRE -240 -48 -272 -48
WIRE -48 112 -16 112
WIRE -528 160 -528 144
WIRE -528 64 -528 32
WIRE -528 32 -512 32
WIRE -528 -32 -528 -16
WIRE -512 -144 -528 -144
WIRE -528 -144 -528 -112
WIRE -144 208 -128 208
WIRE -128 208 -128 176
WIRE -272 -144 -176 -144
WIRE -240 0 -240 -48
WIRE -528 384 -528 368
WIRE -128 208 -48 208
WIRE -48 208 -48 240
WIRE -48 304 -48 320
WIRE -528 288 -528 240
WIRE -528 240 -432 240
WIRE -352 240 -336 240
WIRE -96 32 -96 64
WIRE -176 -144 -96 -144
WIRE -176 -64 -176 -48
WIRE -176 -48 -96 -48
WIRE -96 -48 -96 -64
WIRE -272 480 -272 464
WIRE -272 368 -272 384
WIRE -128 464 -128 480
WIRE -272 144 -272 128
WIRE -208 320 -192 320
WIRE -272 240 -192 240
WIRE -192 304 -192 320
WIRE -192 320 -128 320
WIRE -288 128 -272 128
FLAG -272 480 0
FLAG -16 112 g2
FLAG -528 -16 0
FLAG -528 160 0
FLAG -512 -144 B
FLAG -272 -48 p
FLAG -512 32 g2
FLAG -336 48 a
FLAG -288 128 g
FLAG -144 208 k
FLAG -272 -144 B
FLAG -528 384 0
FLAG -48 320 0
FLAG -128 480 0
SYMBOL Misc\\triode -240 48 R0
SYMATTR InstName U1
SYMATTR Value 12AX7
SYMBOL Misc\\tetrode -96 112 R0
SYMATTR InstName U2
SYMATTR Value 6V6GT
SYMBOL res -288 128 R0
SYMATTR InstName R2
SYMATTR Value 8.2k
SYMBOL res -192 -160 R0
SYMATTR InstName R1
SYMATTR Value 5k
SYMBOL ind -112 -160 R0
SYMATTR InstName L1
SYMATTR Value 20
SYMBOL voltage -528 -128 R0
WINDOW 3 30 97 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value 290
SYMATTR InstName V1
SYMBOL voltage -528 48 R0
WINDOW 3 26 93 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value 290
SYMATTR InstName V2
SYMBOL res -144 208 R0
SYMATTR InstName R3
SYMATTR Value 820
SYMBOL cap -64 240 R0
SYMATTR InstName C1
SYMATTR Value 330e-6
SYMBOL current -528 368 R180
WINDOW 0 -52 74 Left 0
WINDOW 3 -209 1 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName I1
SYMATTR Value SINE(0 {ampl} 1k)
SYMBOL voltage -336 240 R90
WINDOW 0 -32 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName V3
SYMATTR Value 0
SYMBOL voltage -96 -64 R0
WINDOW 3 36 73 Left 0
SYMATTR InstName V4
SYMATTR Value 0
SYMBOL res -144 304 R0
SYMATTR InstName R4
SYMATTR Value 22
SYMBOL npn -208 272 M0
WINDOW 3 56 63 Left 0
SYMATTR InstName Q1
SYMATTR Value 2N5210
SYMBOL res -288 368 R0
SYMATTR InstName R5
SYMATTR Value 3.54k
SYMBOL diode -144 400 R0
WINDOW 0 41 15 Left 0
WINDOW 3 29 59 Left 0
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL cap -208 240 R0
SYMATTR InstName C2
SYMATTR Value 22p
TEXT -568 528 Left 0 !.include ./doclib/ExcemTubesOK.lib\n.option plotwinsize=0\n.save I(V3) V(a) V(g) V(k) V(p) I(V4)\n.param tstep=100e-3/65536\n*\n* .param ampl=220u\n.step param ampl list 220u 240u 260u\n.tran 0 600.0005m 500m {tstep}\n.four 1k 9 I(V3) V(p)