* SPICE netlist
V1 N002 0 170V
R1 vout 0 {R_LOAD}
V2 N007 0 PULSE(0 3.3 0 1e-6 1e-6 0.5m 1m)
Q3 N001 N008 0 0 MPSA42
R2 N002 N001 2.2k
M1 vout N001 N002 N002 IRF9640
R3 N008 N007 100k
Q1 N010 N014 0 0 MPSA42
R4 N014 N016 10k
R5 0 N016 10k
R6 N010 N009 200k
Q2 N004 N009 N003 0 MPSA92
R7 N009 N003 100k
V3 N003 0 170V
R8 N004 0 {R_LOAD}
V4 N016 0 PULSE(0 3.3 0 1e-6 1e-6 0.5m 1m)
V5 N011 0 PULSE(0 3.3 0 1e-6 1e-6 0.5m 1m)
Q4 N005 N012 N015 0 MPSA42
R9 N012 N011 200k
R10 N015 0 56
R11 N006 N005 330
Q5 N013 N005 N006 0 MPSA92
R12 N013 0 {R_LOAD}
V6 N006 0 170V
R13 N011 0 10k
.op
.tran 4m
.param R_LOAD=6k

* LTspice schematic (.asc)
Version 4
SHEET 1 3648 640
WIRE -1504 -304 -1520 -304
WIRE -1392 -304 -1424 -304
WIRE -1360 -304 -1392 -304
WIRE -1232 -304 -1280 -304
WIRE -1232 -272 -1232 -304
WIRE -160 -224 -368 -224
WIRE 0 -224 -64 -224
WIRE 144 -224 80 -224
WIRE -1392 -208 -1392 -304
WIRE 1376 -208 1280 -208
WIRE 1536 -208 1456 -208
WIRE 1696 -208 1536 -208
WIRE 1824 -208 1776 -208
WIRE -1520 -192 -1520 -304
WIRE -1440 -192 -1520 -192
WIRE 144 -176 144 -224
WIRE 1824 -176 1824 -208
WIRE -1520 -128 -1520 -192
WIRE -512 -128 -560 -128
WIRE -368 -128 -368 -224
WIRE -368 -128 -432 -128
WIRE 1536 -128 1536 -208
WIRE -1792 -80 -1824 -80
WIRE -1696 -80 -1712 -80
WIRE -1584 -80 -1616 -80
WIRE 1280 -80 1280 -208
WIRE 1472 -80 1280 -80
WIRE -1392 -64 -1392 -112
WIRE -1280 -64 -1392 -64
WIRE -1232 -64 -1280 -64
WIRE -560 -64 -560 -128
WIRE -368 -32 -368 -128
WIRE -288 -32 -368 -32
WIRE -112 -32 -112 -160
WIRE -112 -32 -208 -32
WIRE 0 -32 -112 -32
WIRE 144 -32 80 -32
WIRE 416 -32 240 -32
WIRE -1520 -16 -1520 -32
WIRE 1280 -16 1280 -80
WIRE -1824 16 -1824 -80
WIRE 1088 32 1024 32
WIRE 1104 32 1088 32
WIRE 1216 32 1184 32
WIRE -1232 48 -1232 16
WIRE 1536 64 1536 -32
WIRE 192 80 192 32
WIRE 1024 96 1024 32
WIRE 1088 112 1088 32
WIRE 1280 144 1280 80
WIRE 1536 192 1536 144
WIRE 16 224 -16 224
WIRE 192 224 192 160
WIRE 192 224 96 224
WIRE 272 224 192 224
WIRE 416 224 416 -32
WIRE 416 224 352 224
WIRE 1024 224 1024 176
WIRE 1088 224 1088 192
WIRE 1088 224 1024 224
WIRE 416 272 416 224
WIRE 1024 272 1024 224
WIRE 1280 272 1280 224
WIRE -16 320 -16 224
FLAG -1232 -272 0
FLAG -1232 48 0
FLAG -1280 -64 vout
FLAG -1520 -16 0
FLAG -1824 16 0
FLAG 416 272 0
FLAG -560 -64 0
FLAG 144 -176 0
FLAG -16 320 0
FLAG 1024 272 0
FLAG 1280 272 0
FLAG 1536 192 0
FLAG 1824 -176 0
SYMBOL voltage -1376 -304 R270
SYMATTR InstName V1
SYMATTR Value 170V
SYMBOL res -1248 -80 R0
SYMATTR InstName R1
SYMATTR Value {R_LOAD}
SYMBOL voltage -1696 -80 R90
SYMATTR InstName V2
SYMATTR Value PULSE(0 3.3 0 1e-6 1e-6 0.5m 1m)
SYMBOL npn -1584 -128 R0
SYMATTR InstName Q3
SYMATTR Value MPSA42
SYMBOL res -1408 -320 R90
SYMATTR InstName R2
SYMATTR Value 2.2k
SYMBOL pmos -1440 -112 M180
SYMATTR InstName M1
SYMATTR Value IRF9640
SYMBOL res -1600 -96 R90
SYMATTR InstName R3
SYMATTR Value 100k
SYMBOL npn 144 32 R270
SYMATTR InstName Q1
SYMATTR Value MPSA42
SYMBOL res 176 64 R0
SYMATTR InstName R4
SYMATTR Value 10k
SYMBOL res 368 208 R90
SYMATTR InstName R5
SYMATTR Value 10k
SYMBOL res 96 -48 R90
SYMATTR InstName R6
SYMATTR Value 200k
SYMBOL pnp -64 -160 M270
SYMATTR InstName Q2
SYMATTR Value MPSA92
SYMBOL res -192 -48 R90
SYMATTR InstName R7
SYMATTR Value 100k
SYMBOL voltage -416 -128 R90
SYMATTR InstName V3
SYMATTR Value 170V
SYMBOL res -16 -208 R270
SYMATTR InstName R8
SYMATTR Value {R_LOAD}
SYMBOL voltage 112 224 R90
SYMATTR InstName V4
SYMATTR Value PULSE(0 3.3 0 1e-6 1e-6 0.5m 1m)
SYMBOL voltage 1024 80 R0
SYMATTR InstName V5
SYMATTR Value PULSE(0 3.3 0 1e-6 1e-6 0.5m 1m)
SYMBOL npn 1216 -16 R0
SYMATTR InstName Q4
SYMATTR Value MPSA42
SYMBOL res 1200 16 R90
SYMATTR InstName R9
SYMATTR Value 200k
SYMBOL res 1264 128 R0
SYMATTR InstName R10
SYMATTR Value 56
SYMBOL res 1472 -224 R90
SYMATTR InstName R11
SYMATTR Value 330
SYMBOL pnp 1472 -32 M180
SYMATTR InstName Q5
SYMATTR Value MPSA92
SYMBOL res 1520 48 R0
SYMATTR InstName R12
SYMATTR Value {R_LOAD}
SYMBOL voltage 1680 -208 R270
SYMATTR InstName V6
SYMATTR Value 170V
SYMBOL res 1072 96 R0
SYMATTR InstName R13
SYMATTR Value 10k