aussiebloke
New Member
G'day all.
I am wanting to build an image orthicon B&W television camera and have the complete circuit diagram for a 1960s transistorized image orthicon camera chain. Unfortunately the circuit has obsolete germanium transistors so I need to somehow substitute modern available silicon transistors in place of them and have been reading up some modification tips on substituting germaniums for silicons here http://www.hawestv.com/transistorize/germanium1.htm .
Anyhow cutting to the chase I need to be able to test sections of the camera's circuitry using the original germanium transistors in LTspice and then with silicon transistors along with the necessary modifications test the circuitry again to see if the results match the original design. However I haven't got the faintest idea in understanding the code values of the transistors eg.:
.MODEL 2N3393 NPN(IS=12.03E-15 ISE=8.195E-12 ISC=0 XTI=3 BF=154.1 BR=4.379 IKF=0.1072 IKR=0 XTB=1.5 VAF=37.37 VAR=12.5 VJE=0.65 VJC=0.65 RE=0.1 RC=1 RB=10 CJE=8.307E-12 CJC=5.777E-12 XCJC=0.75 FC=0.5 NF=1 NR=1 NE=1.971 NC=2 MJE=0.384 MJC=0.3199 TF=385.4E-12 TR=783.8E-12 ITF=0.17 VTF=3 XTF=8 EG=1.11 KF=1E-9 AF=1 VCEO=25 ICRATING=500M MFG=NSC)
All of those vales make absolutely no sense to me and do not even resemble anything of that transistor's given values on alltransistors.com http://alltransistors.com/transistor.php?transistor=3141 which are:
2N3393 Transistor Datasheet. Parameters and Characteristics.
Name: 2N3393
Material of transistor: Si
Polarity: npn
Maximum collector power dissipation (Pc): 200mW
Maximum collector-base voltage (Ucb): 25V
Maximum collector-emitter voltage (Uce): 25V
Maximum emitter-base voltage (Ueb): 5V
Maximum collector current (Ic max): 100mA
Maximum junction temperature (Tj): 125°C
Transition frequency (ft): 70MHz
Collector capacitance (Cc), Pf: 12
Forward current transfer ratio (hFE), min/max: 90/400
Manufacturer of 2N3393 transistor: GEN
Package of 2N3393 transistor: TO98-1
Application: Low Power, General Purpose
So I was wondering if anyone can help me on how to go about adding transistors and encoding the transistors specifications to that of LTspice's mumbo jumbo coding? Any advice would be much appreciated.
Lastly here's the list of transistors this camera contains:
2N337 X5 (can subsitute with 2N699 except IO safety circuit)
2N491 X3
2N699 X3
2N743 X1
2N1022 X2
2N1131 X2
2N1143 X12 (can substitute with 2N1301)
2N1274 X1
2N1308 X2
2N1415 X2
2N1546 X2
2N1565 X1
4N1908 X4
2N1997 X9
2N1999 X23
2N2000 X1 (can substitute with 2N1046)
2N2102 X2
2N2145 X1
2N2157A X4
2N2671 X28 (can substitute with 2N2084 & 2N1309)
I am wanting to build an image orthicon B&W television camera and have the complete circuit diagram for a 1960s transistorized image orthicon camera chain. Unfortunately the circuit has obsolete germanium transistors so I need to somehow substitute modern available silicon transistors in place of them and have been reading up some modification tips on substituting germaniums for silicons here http://www.hawestv.com/transistorize/germanium1.htm .
Anyhow cutting to the chase I need to be able to test sections of the camera's circuitry using the original germanium transistors in LTspice and then with silicon transistors along with the necessary modifications test the circuitry again to see if the results match the original design. However I haven't got the faintest idea in understanding the code values of the transistors eg.:
.MODEL 2N3393 NPN(IS=12.03E-15 ISE=8.195E-12 ISC=0 XTI=3 BF=154.1 BR=4.379 IKF=0.1072 IKR=0 XTB=1.5 VAF=37.37 VAR=12.5 VJE=0.65 VJC=0.65 RE=0.1 RC=1 RB=10 CJE=8.307E-12 CJC=5.777E-12 XCJC=0.75 FC=0.5 NF=1 NR=1 NE=1.971 NC=2 MJE=0.384 MJC=0.3199 TF=385.4E-12 TR=783.8E-12 ITF=0.17 VTF=3 XTF=8 EG=1.11 KF=1E-9 AF=1 VCEO=25 ICRATING=500M MFG=NSC)
All of those vales make absolutely no sense to me and do not even resemble anything of that transistor's given values on alltransistors.com http://alltransistors.com/transistor.php?transistor=3141 which are:
2N3393 Transistor Datasheet. Parameters and Characteristics.
Name: 2N3393
Material of transistor: Si
Polarity: npn
Maximum collector power dissipation (Pc): 200mW
Maximum collector-base voltage (Ucb): 25V
Maximum collector-emitter voltage (Uce): 25V
Maximum emitter-base voltage (Ueb): 5V
Maximum collector current (Ic max): 100mA
Maximum junction temperature (Tj): 125°C
Transition frequency (ft): 70MHz
Collector capacitance (Cc), Pf: 12
Forward current transfer ratio (hFE), min/max: 90/400
Manufacturer of 2N3393 transistor: GEN
Package of 2N3393 transistor: TO98-1
Application: Low Power, General Purpose
So I was wondering if anyone can help me on how to go about adding transistors and encoding the transistors specifications to that of LTspice's mumbo jumbo coding? Any advice would be much appreciated.
Lastly here's the list of transistors this camera contains:
2N337 X5 (can subsitute with 2N699 except IO safety circuit)
2N491 X3
2N699 X3
2N743 X1
2N1022 X2
2N1131 X2
2N1143 X12 (can substitute with 2N1301)
2N1274 X1
2N1308 X2
2N1415 X2
2N1546 X2
2N1565 X1
4N1908 X4
2N1997 X9
2N1999 X23
2N2000 X1 (can substitute with 2N1046)
2N2102 X2
2N2145 X1
2N2157A X4
2N2671 X28 (can substitute with 2N2084 & 2N1309)