* SPICE netlist
Q1 N014 N014 N016 0 MPSA42
Q2 o2 N014 N015 0 MPSA42
Q3 N014 i+ N013 0 MPSA92
Q4 o2 i- N012 0 MPSA92
R1 N016 vcc- 100
R2 N011 N012 100
R3 N011 N013 100
R4 N015 vcc- 100
Q5 N009 N007 vcc+ 0 MPSA92
Q6 N011 N009 N007 0 MPSA92
Q7 N008 N010 vcc- 0 MPSA42
Q8 N006 N008 N010 0 MPSA42
Q9 N003 i+ N005 0 MPSA42
Q10 o1 i- N004 0 MPSA42
R6 N005 N006 100
R7 N004 N006 100
Q11 N003 N003 N002 0 MPSA92
Q12 o1 N003 N001 0 MPSA92
R8 vcc+ N001 67
R9 vcc+ N002 67
R10 N010 vcc- 380
R11 vcc+ N007 320
R12 N008 grnd 4k7
R13 N009 grnd 4k7
+ IS=28.39F
+ BF=127.12
+ VAF=13.033
+ IKF=.1566
+ ISE=103.89E-15
+ NE=1.2763
+ BR=499.50
+ VAR=50
+ IKR=3.5m
+ ISC=1500P
+ NC=2.9970
+ NR=1
+ NF=1
+ RB=11.300
+ RC=778.1m
+ RE=490.00E-6
+ CJE=109.36E-12
+ VJE=1.2027
+ MJE=.36517
+ CJC=22.069E-12
+ VJC=1.5000
+ MJC=.47644
+ TF=5.0525E-9
+ XTF=4.4954
+ XTB=1.5
+ VTF=24.240
+ ITF=.30881
+ TR=4.8693E-6 )
+ IS=18.36E-15
+ BF=60.596
+ VAF=9.2909
+ IKF=.0207
+ ISE=1.3215E-12
+ NE=1.7767
+ NF=1.15
+ BR=499.50
+ VAR=100
+ IKR=19.980
+ ISC=75E-9
+ NC=3.9970
+ RE=490.00E-6
+ RB=5.2315
+ RC=1.0000E-3
+ CJE=104.69E-12
+ VJE=1.0643
+ MJE=.41036
+ CJC=9.8356E-12
+ VJC=.35
+ MJC=.28065
+ TF=5.1798E-9
+ XTF=3.2122
+ VTF=25.040
+ ITF=.19258
+ XTB=1.5
+ TR=6.837E-6)
.step param r list 80 90 100 110 120

* LTspice schematic (.asc)
Version 4
SHEET 1 1088 1936
WIRE 64 -888 64 -968
WIRE 64 -888 -272 -888
WIRE 256 -888 64 -888
WIRE -272 -840 -272 -888
WIRE 256 -840 256 -888
WIRE -272 -712 -272 -760
WIRE 256 -712 256 -760
WIRE 160 -664 -208 -664
WIRE 192 -664 160 -664
WIRE 160 -584 160 -664
WIRE 256 -584 256 -616
WIRE 256 -584 160 -584
WIRE -272 -552 -272 -616
WIRE 544 -552 -272 -552
WIRE -272 -520 -272 -552
WIRE 256 -520 256 -584
WIRE -336 -472 -384 -472
WIRE 400 -472 320 -472
WIRE -272 -392 -272 -424
WIRE 256 -392 256 -424
WIRE -272 -296 -272 -312
WIRE 256 -296 256 -312
WIRE 256 -296 -272 -296
WIRE -48 -264 -544 -264
WIRE 64 -264 64 -888
WIRE 256 -264 64 -264
WIRE 256 -232 256 -264
WIRE -544 -200 -544 -264
WIRE -48 -184 -48 -264
WIRE -48 -184 -80 -184
WIRE 0 -184 -48 -184
WIRE 64 -168 64 -264
WIRE -80 -152 -80 -184
WIRE 256 -120 256 -152
WIRE 256 -120 128 -120
WIRE -272 -88 -272 -296
WIRE 256 -88 256 -120
WIRE -80 -40 -80 -72
WIRE -80 -40 -208 -40
WIRE 64 -40 64 -72
WIRE 192 -40 64 -40
WIRE -80 -8 -80 -40
WIRE 64 -8 64 -40
WIRE -272 40 -272 8
WIRE -144 40 -272 40
WIRE -384 72 -384 -472
WIRE -384 72 -512 72
WIRE -272 72 -272 40
WIRE 400 72 400 -472
WIRE 512 72 400 72
WIRE 0 104 0 -184
WIRE 64 104 64 72
WIRE 64 104 0 104
WIRE -272 184 -272 152
WIRE -80 184 -80 88
WIRE -80 184 -272 184
WIRE 256 264 256 8
WIRE 256 264 -272 264
WIRE -272 296 -272 264
WIRE 256 296 256 264
WIRE -272 408 -272 376
WIRE 256 408 256 376
WIRE -384 456 -384 72
WIRE -336 456 -384 456
WIRE 400 456 400 72
WIRE 400 456 320 456
WIRE -272 552 -272 504
WIRE 544 552 -272 552
WIRE 256 568 256 504
WIRE 256 568 160 568
WIRE -272 600 -272 552
WIRE 256 600 256 568
WIRE 160 648 160 568
WIRE 160 648 -208 648
WIRE 192 648 160 648
WIRE -272 744 -272 696
WIRE 256 744 256 696
WIRE -272 872 -272 824
WIRE -80 872 -80 184
WIRE -80 872 -272 872
WIRE 256 872 256 824
WIRE 256 872 -80 872
WIRE -80 968 -80 872
FLAG -512 72 i-
FLAG 512 72 i+
FLAG 544 -552 o1
FLAG 64 -968 vcc+
FLAG -80 968 vcc-
FLAG -544 -200 grnd
FLAG 544 552 o2
SYMBOL npn 192 600 R0
SYMATTR InstName Q1
SYMATTR Value MPSA42
SYMBOL npn -208 600 M0
SYMATTR InstName Q2
SYMATTR Value MPSA42
SYMBOL pnp 320 504 R180
SYMATTR InstName Q3
SYMATTR Value MPSA92
SYMBOL pnp -336 504 M180
SYMATTR InstName Q4
SYMATTR Value MPSA92
SYMBOL res 240 728 R0
SYMATTR InstName R1
SYMATTR Value 100
SYMBOL res -288 280 R0
SYMATTR InstName R2
SYMATTR Value 100
SYMBOL res 240 280 R0
SYMATTR InstName R3
SYMATTR Value 100
SYMBOL res -288 728 R0
SYMATTR InstName R4
SYMATTR Value 100
SYMBOL pnp 128 -72 R180
SYMATTR InstName Q5
SYMATTR Value MPSA92
SYMBOL pnp 192 8 M180
SYMATTR InstName Q6
SYMATTR Value MPSA92
SYMBOL npn -144 -8 R0
SYMATTR InstName Q7
SYMATTR Value MPSA42
SYMBOL npn -208 -88 M0
SYMATTR InstName Q8
SYMATTR Value MPSA42
SYMBOL npn 320 -520 M0
SYMATTR InstName Q9
SYMATTR Value MPSA42
SYMBOL npn -336 -520 R0
SYMATTR InstName Q10
SYMATTR Value MPSA42
SYMBOL res 240 -408 R0
SYMATTR InstName R6
SYMATTR Value 100
SYMBOL res -288 -408 R0
SYMATTR InstName R7
SYMATTR Value 100
SYMBOL pnp 192 -616 M180
SYMATTR InstName Q11
SYMATTR Value MPSA92
SYMBOL pnp -208 -616 R180
SYMATTR InstName Q12
SYMATTR Value MPSA92
SYMBOL res -288 -856 R0
SYMATTR InstName R8
SYMATTR Value 67
SYMBOL res 240 -856 R0
SYMATTR InstName R9
SYMATTR Value 67
SYMBOL res -288 56 R0
SYMATTR InstName R10
SYMATTR Value 380
SYMBOL res 240 -248 R0
SYMATTR InstName R11
SYMATTR Value 320
SYMBOL res -64 -56 R180
SYMATTR InstName R12
SYMATTR Value 4k7
SYMBOL res 48 -24 R0
SYMATTR InstName R13
SYMATTR Value 4k7