Sega Star Trek Electronic Component Replacement Lists:

For many folks, the most difficult part of any restoration project is repairing the circuit boards. Aside from troubleshooting the circuitry, the next greatest challenge is purchasing the required components. The hardest part of doing that is simply figuring out the part numbers. The art of determining exactly what to buy and where to buy it is called sourcing. Over the years, I have been relatively proficient at this task. I am providing the following lists in the interest of helping other to repair and maintain their machines. I endevour to prevent errors, but you are ultimately responsible for your own projects. I will not be held responsible for costs or problems related to errors in any list on my website. If you encounter an error, I would appreciate it if you email me a notification of the error so that I can correct it.

The following parts lists are not complete BOM's. The parts listed are only recommended to be replaced as part of an overhaul as they are the most likely to cause failure. If there is a part missing from a list that you would like added, email me with your request and I'll try to find an appropriate component for you.

• Transistor Substitutes: 2N6259 for Sega GO8 Monitor
• Transistor Substitutes: MPSU10 (NPN) and MPSU60 (PNP) for Sega GO8 Monitor
• Sega GO8 Color XY Monitor: Rebuild Kit
• Sega G80 Power Supply: Rebuild Kit

Transistor Substitutes Introduction:

I have recently been sourcing components for wg6100 and Sega GO8 (and other vector) monitor rebuilds and I've collected some useful intel. I know that it can be a royal pita to source the big 2N3716 (NPN) and 2N3792 (PNP) and 2N6259 (NPN) transistors. They are not impossible to find (i.e. Bob Roberts, Newark, etc.) but sometimes they can be hard to find in stock and for reasonable prices. Worst case, they come from the USA by mule or the UK by sea-monkey and you have to wait for a few weeks or longer to get them.

I have seen posts in the past asking if there were any subs available... well, there are plenty, so here you go.

All of the substitutes that I have listed below should work, but I have not tried them all personally. Other people have tried and proven many of them, if not all. Many of them are actually superior to the original device. I just went through all of their datasheets, all of which I found on the Digikey site. The parts with the parameter (ft = 2 MHz) are known to work okay. The original 2N3716/92 parts have ft = 4 MHz and so do most of the subs listed below.

Any part having similar parameters such as...

• Ic (max collector current) equal to or greater than the original part spec
• Vce (max voltage) equal to or greater than the original part spec
• second breakdown (Is/b) equal to or greater than the original part spec
• similar gain (hfe about 60)
• same TO-3 case
• same bandwidth (ft)

...will work as good replacement parts. All of the parts listed below meet these requirements.

If anyone tries any of the parts listed below and it fails and is known to be the root cause of failure, please email me and let me know. I will add such reports to the list or remove the part from the list.

Before I make this next statement, I want to say first that I have the greatest respect for Bob Roberts. He is an honest and very experienced and knowledgeable person. He has contributed immeasureably to the arcade hobby and business for many years and the world is a much better place because he is a part of it. That said, I also want to say that although Bob's monitor rebuild kits are wonderful, you must be aware that Bob's GO8 kit comes with 2N3916 transistors. These are sorely inadequate for the GO8 and they WILL fail almost immediately after installation and most likely lead to the immediate destruction of several other components as well. Many people have learned this lesson the hard way. Bob has been notified of this but as far as I know, he has not changed his kit contents.

DO NOT INSTALL 2N3916's in your GO8 monitor !!! You have been warned.

2N6259 (NPN) Substitutes for Sega G08-003 Color XY Monitor:

The large 2N6259 (NPN) transistors for G08-003 monitor rebuilds can be difficult to find in stock, especially for reasonable prices. All of the "known" substitutes that I have listed below have been proven to work.

The most difficult parameter to match (with respect to 2N6259) is the secondary breakdown (Is/b). The more current that the device can carry at the highest voltage possible, the more reliable it will be. The 2N6259 was superior in this way to all of the suggested substitute devices having a rating of 2.5A @ 100V.

The best choice substitute device listed below is MJ21196. I have personally installed the MJ21196 in my own GO8 and it works great.

It is interesting to note that the MJ15003 (NPN) and the MJ15004 (PNP) devices were used in the factory original G08-001, the first version of the monitor, and they were known to fail relatively frequently. Most, if not all, of the substitutes listed below have a superior secondary breakdown value to these.

I have seen in at least one document (the very well presented and useful Mongo’s Simple Sega G80 Vector Mods) the part number mis-typed as 2N6529. Such a device does exist as small low power UHF microwave transistor. Obviously, it is not the device that we are concerned with.

Known subs for 2N6259 (NPN, 150V, 16A, ft = 2 MHz, case TO-3 or TO-204) :

Part Number	Manufacturer	Description	Secondary Breakdown (Is/b)	Newark #, Price	Digikey #, Price USD
MJ21196G (best choice)	Onsemi	16A, 250V	3.0A @ 80V 2.2A @ 100V 1.4A @ 150V		MJ21196GOS-ND $3.78ea, $3.29/10
MJ21194	Onsemi	16A, 250V	2.5A @ 80V 2.0A @ 100V 1.0A @ 150V		MJ21194GOS-ND $4.40ea, $3.83/10
MJ15022	Onsemi	16A, 200V, ft = 4 MHz	2.0A @ 80V 1.0A @ 100V	26K4518 $4.10ea, $3.49/25	Mouser 863-MJ15022G $4.96ea, $4.08/25
MJ15024	Onsemi	16A, 250V, ft = 4 MHz	2.0A @ 80V 1.0A @ 100V		MJ15024GOS-ND $4.40ea, $3.83/10
MJ15003	Onsemi	20A, 140V, ft = 2 MHz	1.5A @ 80V 1.0A @ 100V		MJ15003GOS-ND $3.78ea, $3.29/10

 

Possible subs for 2N6259 (NPN, 150V, 16A, ft = 2 MHz, case TO-3 or TO-204) :

Note: These will probably work okay. They are not as reliable as the original 2N6259 part but they have better secondary breakdown values than the MJ150xx parts listed above that are known to work.

Part Number	Manufacturer	Description	Secondary Breakdown (Is/b)	Newark #, Price	Digikey #, Price USD
2N3773	STMicro	16A, 140V	2.0A @ 70V 1.5A @ 100V	45J2472, $3.62	497-6204-ND, $4.16ea, $3.27/10
2N3773G	On Semi	16A, 140V	2.0A @ 70V 1.5A @ 100V	45J2472, $3.62	2N3773GOS-ND, $3.89ea, $3.38/10
2N4348	Mospec	16A, 180V	2.0A @ 70V 1.5A @ 100V
NTE284	NTE	16A, 180V	?		NTE284 comes up as sub for 2N4348 on Mouser site but price is stupid and the datasheet shows no Is/b value.

MPSU10 (NPN) and MPSU60 (PNP) Sega G08-003 Color XY Monitor:

• Sega G08-003 Color XY

The MPSU10 and MPSU60 transistors were discontinued long ago and are very difficult to source. I have seen them sold online for as much as $12 each. Bob Roberts still sells the MPSU10 for $3 each and that's a great deal.

Simple specs:

• Vce : 300V
• Ic max : 500 mA
• hfe : 40
• f t : 45 MHz
• case: TO-202N ( pinned EBC and has thin heatsink tab)

Many substitutes have been suggested in the past but most (maybe all) have been pinned BCE, not EBC so you had to be careful to bend the pins around and maybe rotate the part to install it correctly. The parts that I have listed below are pinned correctly as EBC and have virtually identical specifications to the original parts. If you didn't know any better, you'd think that you were reading the original datasheets. I have personally installed these substitutes in my own GO8 monitor and they have been working perfectly and without any issues whatsoever.

Ref	Section	Description	Comments	Mfr, Part#	Supplier, Part#	$ each	Qty	$ Total
Q602, Q603, Q702, Q703	Def	MPSW42G	superior part replaces original MPSU10	OnSemi, MPSW42G	Digikey, MPSW42GOS-ND	$0.64	4	$2.56
Q601, Q604, Q701, Q704	Def	MPSW92G	superior part replaces original MPSU60	OnSemi, MPSW92RLRAG (cut tape since bulk unavailable)	Digikey, MPSW92RLRAGOSCT-ND	$0.64	4	$2.56
Q601, Q602, Q603, Q604, Q701, Q702, Q703, Q704	Def	Heatsink for transistors	press-on with heatsink grease to TO-92 cases	Aavid Thermalloy, 575200B00000G	Digikey, HS251-ND	$0.384 at 10 pieces	8	$3.84/10

Sega GO8 Color XY Monitor Rebuild Kit:

Capacitors:

Ref	Section	Description	Mfr, Part#	Supplier, Part#	$ each	Qty	$ Total
C401	Def	CAP 1000UF 160V ELECT LS SNAP size: 0.866" Dia x 1.772" H (22.00mm x 45.00mm) lead spacing: 0.394" (10mm)	Nichicon, LLS2C102MELZ	Digikey, 493-2460-ND	$4.55	1	$4.55
C800, C801, C802, C803, C405, C406	Vid input Vid input Vid input Vid input Def Def	CAP 10UF 50V ALUM LYTIC RADIAL size: 0.197" Dia x 0.433" H (5.00mm x 11.00mm) lead spacing: 0.079" (2.00mm)	Panasonic, ECA-1HM100	Digikey, P5178-ND	$0.18	6	$1.08
C411	Def	CAP 22UF 350V ELECT EE RADIAL size: 0.492" Dia x 0.787" H (12.50mm x 20.00mm) lead spacing: 0.197" (5.00mm)	Panasonic, EEU-EE2V220	Digikey, P13652-ND	$1.10	1	$1.10
C601, C701	Def	CAP 47UF 35V ALUM LYTIC RADIAL size: 0.197" Dia x 0.433" H (5.00mm x 11.00mm) lead spacing: 0.079" (2.00mm)	Panasonic, ECA-1VM470	Digikey, P5164-ND	$0.22	2	$0.44
C900, C901	HV	CAP 4.7MFD 35V KG RAD ALUM ELEC size: 0.158" Dia x 0.276" H (4.00mm x 7.00mm) lead spacing: 0.059" (1.50mm)	Panasonic, ECE-A1VKG4R7	Digikey, P920-ND	$0.23	2	$0.46
C904, C905	HV	CAP 22UF 35V ALUM LYTIC RADIAL size: 0.197" Dia x 0.433" H (5.00mm x 11.00mm) lead spacing: 0.079" (2.00mm) Note: GO8-FAQ & schematic shows as C904. The PCB screen on my unit shows C902 in this location.	Panasonic, ECA-1VM220	Digikey, P5162-ND	$0.18	2	$0.36
C911	HV	CAP 100UF 35V ELECT FC RADIAL size: 0.315" Dia x 0.453" H (8.00mm x 11.50mm) lead spacing: 0.138" (3.50mm)	Panasonic, EEU-FC1V101	Digikey, P10294-ND	$0.46	1	$0.46
C916	HV	CAP 47UF 200V ELECT EB RADIAL size: 0.492" Dia x 0.787" H (12.50mm x 20.00mm) lead spacing: 0.197" (5.00mm)	Panasonic, EB2D470	Digikey, P5914-ND	$1.18	1	$1.18
C402	Def	CAP 680UF 400V ELECT TUP size: 1.575" Dia x 1.969" H (40.00mm x 50.00mm) lead spacing: 0.886" (22.50mm)	Panasonic, ECE-T2GP681FA	Digikey, P13183-ND	$12.78	1	$12.78
C403, C404	Def	CAP 6800UF 80V ELECT THA SERIES size: 1.378" Dia x 1.969" H (35.00mm x 50.00mm) lead spacing: 0.886" (22.50mm)	Panasonic, ECE-T1KA682EA	Digikey, P10642-ND	$11.03	2	$22.06

 

Transistors:

Ref	Section	Description	Comments	Mfr, Part#	Supplier, Part#	$ each	Qty	$ Total
Q605, Q606, Q705, Q706	Heatsink	TRANS PWR NPN 20A 140V TO-3	Original part	ON Semiconductor, MJ15003G	Digikey, MJ15003GOS-ND	$4.78	4	$19.12
Q605, Q606, Q705, Q706	Heatsink	TRANS PWR NPN 16A 250V TO-3	Much better than MJ15003G	ON Semiconductor, MJ21196	Digikey, MJ21196GOS-ND	$4.78	4	$19.12
Q605, Q606, Q705, Q706	Heatsink	Mica insulator for TO-3 transistor		Keystone, 4651	Digikey, 4651K-ND	$1.57/10	1	$1.57
Q605, Q606, Q705, Q706	Heatsink	Socket for TO-3 transistor		Keystone, 4601	Digikey, 4601K-ND	$3.01	4	$12.04
Q901, Q801, Q803	HV, Vid input Vid input	MPSA56	superior part to replace original 2N3906	Fairchild, MPSA56	Digikey, MPSA56-ND	$0.29	3	$0.87
Q903, Q800, Q802	HV, Vid input Vid Input	MPSA06	superior part to replace original 2N3904	Fairchild, MPSA06	Digikey, MPSA06-ND	$0.34	3	$1.02
Q602, Q603, Q702, Q703	Def	MPSW42G	superior part replaces original MPSU10	OnSemi, MPSW42G	Digikey, MPSW42GOS-ND	$0.64	4	$2.56
Q601, Q604, Q701, Q704	Def	MPSW92G	superior part replaces original MPSU60	OnSemi, MPSW92RLRAG (cut tape since bulk unavailable)	Digikey, MPSW92RLRAGOSCT-ND	$0.64	4	$2.56
Q601, Q602, Q603, Q604, Q701, Q702, Q703, Q704	Def	Heatsink for transistors	press-on with heatsink grease to TO-92 cases	Aavid Thermalloy, 575200B00000G	Digikey, HS251-ND	$0.384 at 10 pieces	8	$3.84/10

 

Ceramic resistors:

Ref	Section	Description	Mfr, Part#	Supplier, Part#	$ each	Qty	$ Total
R635, R735	Def	3 ohm 20W ceramic	OHMITE, B20J3R0E	Digikey, B20J3R0E-ND	$5.04	2	$10.08

The two ceramic resistors replace the teepees seen on a lot of deflection boards.

 

Headers:

Ref	Section	Description	Mfr, Part#	Supplier, Part#	$ each	Qty	$ Total
P800	Vid input Def	PCB rectangular header, vertical, 6p, 0.156" pitch, square post, friction lock, (for video signal input)	Tyco, 640445-6 or 644752-6	Digikey, A1973-ND or A24168-ND	$0.37	2	$0.74
J800	Vid input Def	rectangular housing with ramp, natural alternate: rectangular housing with ramp, white	Molex, 09-50-3061, 09-50-8061	Digikey, WM2104-ND, WM2126-ND	$0.56, $0.60	2	$1.12, $1.12

Paddle boards (current limiting):

Ref	Section	Description	Comments	Mfr, Part#	Supplier, Part#	$ each	Qty	$ Total
R202, R203	Paddle H	resistor, 0.15 ohm, 1%, 3W, metal	replaces original 2W, 5%	Ohmite, 13FR150E	Digikey, 13FR150E-ND	$2.10	2	$4.20
R252, R253	Paddle V	resistor, 0.16 ohm, 2W, 5%, carbon	Note: use 0.15 ohm part above	NA	NA
P250, P200	Paddle V Paddle H	PCB female header socket, 7p, 0.156" pitch, right angle		Molex, 09-48-1074	Digikey, WM13304-ND	$1.61	2	$3.22
P251, P201	Paddle V Paddle H	PCB male header, 7p, 0.156" pitch, right angle	Note: alternate with lock: Tyco# 640389-7 Digikey# A19922-ND $0.98	Tyco, 640385-7 or 644751-7	Digikey, A19878-ND or A24160-ND	$0.39	2	$0.78
P600, P700	Def	PCB male header, 7p, 0.156" pitch, vertical		Tyco, 640445-7 or 644752-7	Digikey, A19892-ND or, A24169-ND	$0.39	2	$0.78
J600, J700	Paddle V Paddle H	rectangular housing, 7p, w/ramp, natural	Alternate (white): Tyco# 640250-7, Digikey# A19955-ND	Molex, 09-50-3071	Digikey, WM2105-ND	$0.66	2	$1.32
Q251, Q201	Paddle V Paddle H	MPSA56	superior part to replace original 2N3906	Fairchild, MPSA56	Digikey, MPSA56-ND	$0.29	2	$0.58
Q252, Q202	Paddle V Paddle H	MPSA06	superior part to replace original 2N3904	Fairchild, MPSA06	Digikey, MPSA06-ND	$0.34	2	$0.68

 

Fuses:

Note: In my opinion, the original fuses were grossly overrated.  Overrating a fuse serves no practical purpose.  If a component fails, that's it.  A tougher fuse is not going to fix that problem.  It's only going to allow more components to fry.

Ref	Section	Description	Comments	Mfr, Part#	Supplier, Part#	$ each	Qty	$ Total
F400, F401	Def	4A, 250V, T-lag, 1.25"x0.25" glass	Replaces original 5A, 125V	Cooper/Bussman, BK/MDL-4-R	Digikey, 283-2751-ND	$1.18	2	$2.36
F600, F700	Def	2A, 250V, T-lag, 1.25"x0.25" glass	Replaces original 4A, 125V	Cooper/Bussman, BK/MDL-2-R	Digikey, 283-2741-ND	$1.18	2	$2.36

Sega G80 Power Supply:

Ref	Section	Description	Comments	Mfr, Part#	Supplier, Part#	$ each	Qty	$ Total
F1, F2	Board	3A, 250V, Normal, 1.25"x0.25" glass		Cooper/Bussman, BK/AGC-3-R	Digikey, 283-2629-ND	$0.51	2	$1.02
F3	Board	8A, 250V, T-lag, 1.25"x0.25" glass	Replaces original 10A, 125V	Cooper/Bussman, BK/MDL-8-R	Digikey, 283-2755-ND	$1.11	1	$1.11
F4	Board	2A, 250V, Normal,	Replaces original 1.5A, 125V	Cooper/Bussman, BK/AGC--R	Digikey, 283-2626-ND	$0.51	1	$0.51
C5, C8, C10, C18, C19, C23, C24, C26, C31	Board	CAP 10UF 50V MINI ALUM ELECT size: 0.197" Dia x 0.276" H (5.00mm x 7.00mm) lead spacing: 0.197" (5.00mm)		Panasonic, ECE-A1HKA100B	Digikey, ECE-A1HKA100B-ND	$0.102	9	$0.92
C17	Board	CAP 100UF 50V ELECT FC RADIAL size: 0.394" Dia x 0.492" H (10.00mm x 12.50mm) lead spacing: 0.197" (5.00mm)		Panasonic, EEU-FC1H101	Digikey, P10323-ND	$0.50	1	$0.50
C30	Board	CAP 3300UF 25V ELECT KY RAD size: 0.630" Dia x 1.240" H (16.00mm x 31.50mm) lead spacing: 0.295" (7.50mm)		Panasonic, EKY-250ELL332MLN3S	Digikey, 565-1564-ND	$1.48	1	$1.48
C32, C33, C34	Board	CAP 6800UF 35V ELECT VZ RADIAL size: 0.787" Dia x 1.575" H (20.00mm x 40.00mm) lead spacing: 0.394" (10.00mm)		Nichicon, UVZ1V682MRD	Digikey, 493-1326-ND	$3.17	3	$9.51
C15, C16, C27, C28	Board	CAP 4700UF 35V ELECT VR RADIAL size: 0.787" Dia x 1.221" H (20.00mm x 31.00mm) lead spacing: 0.394" (10.00mm)		Nichicon, UVR1V472MRD6	Digikey, 493-1089-ND	$2.10	4	$8.80
U1	Board	IC SOCKET STRAIGHT 14POS GOLD		AssMann Elect. , A14-LCG-T-R	Digikey, AE9990-ND	$1.20	1	$1.20
U1	Board	IC VOLT REGULATOR HI PREC, 14-DIP case		STMicro. , LM723CN	Digikey, 497-1596-5-ND	$0.92	1	$0.92
D10, D12	Board	Diode GPP, 6A, 600V, DO-201AD case	Replaces original MR751, 6A, 100V	Micro Comm. , 60S6-TP	Digikey, 60S6-TPMSCT-ND	$1.02	2	$2.04
D6, D7, D8, D9, D11, D13, D14, D15, D16, D17	Board	Diode ULTR FAST, 4A, 600V, DO-201AD case OR Diode GEN PURP, 3A, 200V, DO-201AD case	Replaces original MR501, 3A, 100V	Micro Comm. , MUR460G OR Fairchild, 1N5402	Digikey, MUR460GOS-ND OR 1N5402FSCT-ND	$0.554 OR $0.298	10	$5.54 OR $2.98
D1, D4, D5	Board	Diode, 100V, 4.0ns, DO-35 case		Fairchild, 1N4148	Digikey, 1N4148FS-ND	$0.05	3	$0.15
Q1, Q7	Board	Transistor, PNP, SS GP 600MA TO-92 case		Fairchild, 2N4403	Digikey, 2N4403-ND	$0.15	2	$0.30
Q2, Q3	Board	Transistor, NPN, SS GP 600mA, TO-92 case		Fairchild, 2N4401	Digikey, 2N4401-ND	$0.14	2	$0.28
313-0023 at P2	HS	IC VREG, 1A, -5V, 4%, 3TERM, TO-220 case	Replaces original 320T5	Fairchild, LM7905CT	Digikey, LM7905CTFS-ND	$0.56	1	$0.56
313-0014 at P3	HS	IC VREG, 1A, +12V, 3TERM, TO-220 case	Replaces original 340T12	Fairchild, LM7812CT	Digikey, LM7812CTFS-ND	$0.51	1	$0.51
313-0015 at P4	HS	IC VREG, 1A, -12V, 3TERM, TO-220 case	Replaces original 320T12	Fairchild, LM7912CT	Digikey, LM7912CTFS-ND	$0.56	1	$0.56
482-0104 at P1	HS	Transistor, NPN, Darl, 10A, 80V, hfe=1000, TO-218 case		Multicomp, TIP141	Newark, 26M4140	$1.76	1	$1.76
482-0100 at P6	HS	Transistor, PNP, Darl, -5A, 60V, TO-220 case		Fairchild, TIP125	Digikey, TIP125TU-ND	$0.66	1	$0.66
482-0019 at P5	HS	Transistor, NPN, Darl, 5A, 60V, TO220AB case		OnSemi, TIP120	Digikey, TIP120GOS-ND	$0.71	1	$0.71
	HS at P1	silicon rubber insulator for TO-218 case	no heatsink grease needed	Richco Plastic, TO-218-70	Digikey, TO-218-70-ND	$0.92	1	$0.92
	HS at P2, P3, P4, P5, P6	mica insulator for TO-220 case	heatsink grease needed	Keystone, 4672	Digikey, 4672K-ND	$0.135	5	$0.68
	HS at P1, P2, P3, P4, P5, P6	Nylon #4 screw insulator Height: 0.047" (1.2mm) Flange, 0.063" (1.6mm) Body ID: 0.115" (2.9mm) OD: 0.235" (6.0mm) Flange, 0.145" (3.7mm) Tube	1 needed on each screw for each part on HS.	Richco Plastic, TO-218-70	Digikey, RP339-ND	$0.23	6 (25min)	$5.89
	HS at P1, P2, P3, P4, P5, P6	4-40 X 1/2"L machine screw	1 needed on each part on HS if using retaining nuts and thru holes.	B&F, PMS 440 0050 PH	Digikey, H346-ND	$0.0263	6 (100min)	$2.63
	HS at P1, P2, P3, P4, P5, P6	4-40 X 1/4"L machine screw	1 needed on each part on HS if using 4-40 tapped holes.	B&F, PMS 440 0025 PH	Digikey, H342-ND	$0.0358	6 (100min)	$3.58
	HS at P1, P2, P3, P4, P5, P6	4-40 x 0.187" hex nut, steel	1 needed on each part on HS if using 4-40x1/2" screws and thru holes.	Tyco, 5205821-2	Digikey, A35230-ND	$0.08	6 (10min)	$0.80

 

 

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