* SPICE netlist
L1 N008 N001 50 Rser=60 Cpar=250p
L2 N001 N019 50 Rser=60 Cpar=250p
L3 LOAD 0 0.47H Rser=0.7
R1 LOAD 0 8
VHT N001 0 450V
VBIAS 0 BIAS 38V Rser=1000
R3 N003 BIAS 220k
R4 BIAS N024 220k
R6 N021 0 10k
R7 UB N004 10k
R8 N016 N021 1k
C3 N021 N022 470n
C4 N004 N005 470n
R9 N010 N021 1Meg
R10 UB N009 10k
R12 N020 0 750
C6 N009 N010 470n
R13 N015 0 1Meg
C7 N014 N015 470n
V1 N012 0 SINE(0 1.41 1k) AC 1 0
C11 N019 0 1000p
C12 0 N008 1000p
R14 BIAS 0 1G
VHT1 UB 0 300V
R11 N006 N003 1k
R15 N025 N024 1k
R5 UB N002 10k
R16 UB N023 10k
R17 N007 0 750
R18 0 N018 750
C2 N002 N003 470n
C5 N023 N024 470n
VHT2 HT2 0 400V
R2 HT2 N017 470
R21 HT2 N011 470
R19 LOAD N020 47k
R20 N014 N013 10k
C1 N014 0 680p
R22 N013 N012 10k
C8 N013 0 680p
R23 N005 0 1Meg
R24 0 N022 1Meg
XV1a N009 N015 N020 12AU7 Triode ;pnba Plate)Grid)Cathode
XV1b N004 N010 N016 12AU7 Triode ;pnba Plate)Grid)Cathode
XV2a N002 N005 N007 12AT7 Triode ;pnba Plate)Grid)Cathode
XV2b N023 N022 N018 12AT7 Triode ;pnba Plate)Grid)Cathode
XV3 N008 N011 N006 0 EL34 Tetrode ;pnba Anode)Screen)Grid)Cathode
XV4 N019 N017 N025 0 EL34 Tetrode ;pnba Anode)Screen)Grid)Cathode
K1 L1 L2 L3 0.9995
.tran 8ms

* LTspice schematic (.asc)
Version 4
SHEET 1 2784 1024
WIRE -672 -464 -848 -464
WIRE -304 -464 -672 -464
WIRE -16 -464 -16 -512
WIRE -16 -464 -304 -464
WIRE -848 -448 -848 -464
WIRE -16 -432 -16 -464
WIRE -304 -416 -304 -464
WIRE 1024 -384 592 -384
WIRE -848 -304 -848 -368
WIRE -16 -272 -16 -352
WIRE 32 -272 -16 -272
WIRE 160 -272 96 -272
WIRE -672 -256 -672 -464
WIRE -16 -224 -16 -272
WIRE -304 -176 -304 -336
WIRE -256 -176 -304 -176
WIRE -160 -176 -192 -176
WIRE -64 -176 -160 -176
WIRE 160 -176 160 -272
WIRE 208 -176 160 -176
WIRE 336 -176 288 -176
WIRE 656 -128 656 -160
WIRE -48 -96 -48 -128
WIRE -160 -80 -160 -176
WIRE 160 -80 160 -176
WIRE 336 -80 336 -176
WIRE 288 -64 256 -64
WIRE -304 -48 -304 -176
WIRE 656 -32 656 -64
WIRE 656 -32 400 -32
WIRE -672 0 -672 -176
WIRE -592 0 -672 0
WIRE -448 0 -528 0
WIRE -352 0 -448 0
WIRE 848 16 736 16
WIRE 896 16 896 -16
WIRE 896 16 848 16
WIRE -672 32 -672 0
WIRE -160 32 -160 0
WIRE -48 32 -48 -16
WIRE -48 32 -160 32
WIRE -16 32 -48 32
WIRE 352 32 352 16
WIRE 400 32 352 32
WIRE 496 32 480 32
WIRE 736 32 736 16
WIRE 848 32 848 16
WIRE -48 64 -48 32
WIRE -1280 80 -1392 80
WIRE -1152 80 -1200 80
WIRE -1120 80 -1152 80
WIRE -976 80 -1040 80
WIRE -928 80 -976 80
WIRE -832 80 -864 80
WIRE -720 80 -832 80
WIRE 160 80 160 0
WIRE 160 80 112 80
WIRE 256 80 256 -64
WIRE 256 80 208 80
WIRE 496 80 496 32
WIRE 544 80 544 48
WIRE 544 80 496 80
WIRE 592 80 592 -384
WIRE 656 80 656 48
WIRE 656 80 592 80
WIRE -448 96 -448 0
WIRE -336 96 -336 48
WIRE -160 112 -160 32
WIRE 208 112 208 80
WIRE 400 112 352 112
WIRE 496 112 496 80
WIRE 496 112 480 112
WIRE 656 112 656 80
WIRE 1216 128 1216 112
WIRE 1392 128 1216 128
WIRE 352 144 352 112
WIRE 160 160 160 80
WIRE 736 160 736 112
WIRE 800 160 736 160
WIRE 848 160 848 112
WIRE 848 160 800 160
WIRE 1024 160 1024 -384
WIRE 1216 160 1216 128
WIRE -832 192 -832 80
WIRE -48 192 -48 144
WIRE 656 192 400 192
WIRE 800 192 800 160
WIRE -1392 208 -1392 80
WIRE -704 208 -704 128
WIRE -656 208 -704 208
WIRE -512 208 -512 192
WIRE -512 208 -576 208
WIRE -1152 224 -1152 80
WIRE 256 224 256 80
WIRE 288 224 256 224
WIRE 656 224 656 192
WIRE -976 240 -976 80
WIRE -448 240 -448 176
WIRE -336 240 -336 176
WIRE -336 240 -448 240
WIRE -256 240 -336 240
WIRE -160 240 -160 192
WIRE -160 240 -192 240
WIRE -64 240 -160 240
WIRE 896 256 896 224
WIRE -704 272 -704 208
WIRE 1392 288 1392 128
WIRE 656 320 656 288
WIRE -16 336 -16 288
WIRE 32 336 -16 336
WIRE 160 336 160 240
WIRE 160 336 96 336
WIRE 208 336 160 336
WIRE 336 336 336 240
WIRE 336 336 288 336
WIRE -336 368 -336 240
WIRE 896 368 896 336
WIRE -16 432 -16 336
WIRE 16 432 -16 432
WIRE -1392 480 -1392 288
WIRE -1152 480 -1152 288
WIRE -1152 480 -1392 480
WIRE -976 480 -976 304
WIRE -976 480 -1152 480
WIRE -832 480 -832 272
WIRE -832 480 -976 480
WIRE -704 480 -704 352
WIRE -704 480 -832 480
WIRE -336 480 -336 448
WIRE -336 480 -704 480
WIRE 608 480 -336 480
WIRE 1024 480 1024 240
WIRE 1024 480 608 480
WIRE 1216 480 1216 240
WIRE 1216 480 1024 480
WIRE 1392 480 1392 368
WIRE 1392 480 1216 480
WIRE 608 512 608 480
FLAG 544 48 HT2
IOPIN 720 240 In
FLAG 208 112 0
FLAG 896 224 HT2
IOPIN 1072 416 Out
FLAG 1216 112 BIAS
IOPIN 1392 304 Out
FLAG 896 -16 LOAD
IOPIN 1072 176 Out
FLAG 112 80 BIAS
IOPIN 288 272 In
FLAG 608 512 0
FLAG -848 -304 0
FLAG 656 320 0
FLAG 656 -160 0
FLAG -512 192 LOAD
IOPIN -336 384 In
FLAG 96 432 UB
IOPIN 272 624 In
FLAG -16 -512 UB
IOPIN 160 -320 Out
FLAG -16 32 0
FLAG 896 368 0
FLAG 800 192 0
SYMBOL ind2 640 -48 R0
SYMATTR InstName L1
SYMATTR Value 50
SYMATTR Type ind
SYMATTR SpiceLine Rser=60 Cpar=250p
SYMBOL ind2 640 96 R0
SYMATTR InstName L2
SYMATTR Value 50
SYMATTR Type ind
SYMATTR SpiceLine Rser=60 Cpar=250p
SYMBOL ind2 752 16 M0
SYMATTR InstName L3
SYMATTR Value 0.47H
SYMATTR Type ind
SYMATTR SpiceLine Rser=0.7
SYMBOL res 832 16 R0
SYMATTR InstName R1
SYMATTR Value 8
SYMBOL voltage 1024 144 R0
SYMATTR InstName VHT
SYMATTR Value 450V
SYMBOL voltage 1216 256 R180
SYMATTR InstName VBIAS
SYMATTR Value 38V
SYMATTR SpiceLine Rser=1000
SYMBOL res 144 -96 R0
SYMATTR InstName R3
SYMATTR Value 220k
SYMBOL res 144 144 R0
SYMATTR InstName R4
SYMATTR Value 220k
SYMBOL res -352 352 R0
SYMATTR InstName R6
SYMATTR Value 10k
SYMBOL res -320 -432 R0
SYMATTR InstName R7
SYMATTR Value 10k
SYMBOL res -352 80 R0
SYMATTR InstName R8
SYMATTR Value 1k
SYMBOL cap -256 256 R270
SYMATTR InstName C3
SYMATTR Value 470n
SYMBOL cap -256 -160 R270
SYMATTR InstName C4
SYMATTR Value 470n
SYMBOL res -464 80 R0
SYMATTR InstName R9
SYMATTR Value 1Meg
SYMBOL res -688 -272 R0
SYMATTR InstName R10
SYMATTR Value 10k
SYMBOL res -720 256 R0
SYMATTR InstName R12
SYMATTR Value 750
SYMBOL cap -592 16 R270
SYMATTR InstName C6
SYMATTR Value 470n
SYMBOL res -848 176 R0
SYMATTR InstName R13
SYMATTR Value 1Meg
SYMBOL cap -928 96 R270
SYMATTR InstName C7
SYMATTR Value 470n
SYMBOL voltage -1392 192 R0
SYMATTR Value SINE(0 1.41 1k)
SYMATTR Value2 AC 1 0
SYMATTR InstName V1
SYMBOL cap 640 224 R0
SYMATTR InstName C11
SYMATTR Value 1000p
SYMBOL cap 640 -128 R0
SYMATTR InstName C12
SYMATTR Value 1000p
SYMBOL res 1376 272 R0
SYMATTR InstName R14
SYMATTR Value 1G
SYMBOL voltage -848 -464 R0
SYMATTR InstName VHT1
SYMATTR Value 300V
SYMBOL res 304 -192 R90
SYMATTR InstName R11
SYMATTR Value 1k
SYMBOL res 304 320 R90
SYMATTR InstName R15
SYMATTR Value 1k
SYMBOL res -32 -448 R0
SYMATTR InstName R5
SYMATTR Value 10k
SYMBOL res 112 416 R90
SYMATTR InstName R16
SYMATTR Value 10k
SYMBOL res -64 -112 R0
SYMATTR InstName R17
SYMATTR Value 750
SYMBOL res -64 48 R0
SYMATTR InstName R18
SYMATTR Value 750
SYMBOL cap 32 -256 R270
SYMATTR InstName C2
SYMATTR Value 470n
SYMBOL cap 32 352 R270
SYMATTR InstName C5
SYMATTR Value 470n
SYMBOL voltage 896 240 R0
SYMATTR InstName VHT2
SYMATTR Value 400V
SYMBOL res 496 96 R90
SYMATTR InstName R2
SYMATTR Value 470
SYMBOL res 496 16 R90
SYMATTR InstName R21
SYMATTR Value 470
SYMBOL res -560 192 R90
SYMATTR InstName R19
SYMATTR Value 47k
SYMBOL res -1024 64 R90
SYMATTR InstName R20
SYMATTR Value 10k
SYMBOL cap -992 240 R0
SYMATTR InstName C1
SYMATTR Value 680p
SYMBOL res -1184 64 R90
SYMATTR InstName R22
SYMATTR Value 10k
SYMBOL cap -1168 224 R0
SYMATTR InstName C8
SYMATTR Value 680p
SYMBOL res -176 -96 R0
SYMATTR InstName R23
SYMATTR Value 1Meg
SYMBOL res -176 96 R0
SYMATTR InstName R24
SYMATTR Value 1Meg
SYMBOL Valve\\triode -672 80 R0
SYMATTR InstName V1a
SYMATTR InstName 12AU7
SYMBOL Valve\\triode -304 0 R0
SYMATTR InstName V1b
SYMATTR InstName 12AU7
SYMBOL Valve\\triode -16 -176 R0
SYMATTR InstName V2a
SYMATTR InstName 12AT7
SYMBOL Valve\\triode -16 240 M180
SYMATTR InstName V2b
SYMATTR InstName 12AT7
SYMBOL Valve\\tetrode 352 -32 R90
SYMATTR InstName V3
SYMATTR InstName EL34
SYMBOL Valve\\tetrode 352 192 M270
SYMATTR InstName V4
SYMATTR InstName EL34