By popular request I finally rolled a subcircuit for my mid '60's MC4024 voltage-controlled multivibrator...
****************************************************************** .SUBCKT MC4024 VCX CX1 CX2 OUT VCCM VCCO GNDM GNDO R_R1 VCX N_1 1K R_R2 N_2 N_3 2.6K R_R4 VCCM N_4 250 R_R3 N_5 GNDM 1.1K R_R10 N_6 GNDM 150 R_R8 N_7 N_6 300 R_R6 N_8 N_9 250 R_R9 N_6 N_10 300 R_R5 VCCM N_11 250 R_R16 VCCM N_12 3.1K R_R15 N_13 N_14 900 R_R19 N_15 N_16 200 R_R18 VCCM N_15 4K R_R20 VCCO N_17 1.4K R_R22 N_18 N_19 250 R_R23 N_18 N_20 500 R_R14 N_21 GNDM 2K R_R13 N_22 GNDM 100 R_R12 N_23 GNDM 100 R_R11 N_24 GNDM 600 R_R21 VCCO N_25 100 R_R7 N_9 N_26 250 R_R17 N_27 N_28 750 Q_Q1 VCCM N_1 N_2 [GNDM] NPN4024 Q_Q2 N_4 N_13 CX1 [GNDM] NPN4024 Q_Q3 VCCM N_4 N_27 [GNDM] NPN4024 Q_Q4 VCCM N_11 N_13 [GNDM] NPN4024 Q_Q6 N_4 N_13 N_8 [GNDM] NPN4024 Q_Q7 N_11 N_27 N_26 [GNDM] NPN4024 Q_Q5 N_11 N_27 CX2 [GNDM] NPN4024 Q_Q21 N_29 N_29 OUT [GNDM] NPN4024 10X Q_Q20 N_25 N_17 N_29 [GNDM] NPN4024 10X Q_Q23 OUT N_18 GNDO [GNDM] NPN4024 10X Q_Q22 N_20 N_19 GNDO [GNDM] NPN4024 Q_Q19 N_17 N_16 N_18 [GNDM] NPN4024 Q_Q18 N_16 N_21 GNDM [GNDM] NPN4024 Q_Q17 N_15 N_28 N_21 [GNDM] NPN4024 Q_Q16 N_28 N_14 N_22 [GNDM] NPN4024 Q_Q15 N_14 N_14 N_23 [GNDM] NPN4024 Q_Q14 N_30 N_30 N_24 [GNDM] NPN4024 Q_Q13 N_12 N_12 N_30 [GNDM] NPN4024 Q_Q12 VCCM N_12 N_3 [GNDM] NPN4024 Q_Q11 CX2 N_3 N_10 [GNDM] NPN4024 Q_Q10 N_9 N_30 N_6 [GNDM] NPN4024 Q_Q8 CX1 N_3 N_7 [GNDM] NPN4024 Q_Q9 N_3 N_3 N_5 [GNDM] NPN4024 ****************************************************************** .MODEL NPN4024 NPN IS=3.860200f BF=120 NF=1.04845 VAF=61.1026 IKF=- 50m ISE=3.100000p NE=2.16533 BR=100m NR=1.04845 ISC=0
- NC=1 RB=214.644 RBM=214.644 RE=721.4m RC=9.2065 CJE=1.249000p
- VJE=900m MJE=500m TF=210.000000p XTF=1.85 VTF=1.585
- ITF=50m PTF=0 CJC=1.000000p VJC=750m MJC=333m
- XCJC=500m TR=10n CJS=6.3p VJS=750m MJS=
- 500m XTB=1.5 EG=1.11 XTI=3 KF=0 AF=1 FC=500m
...Jim Thompson