Rep: 99
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I have a vintage Sherwood receiver and I need to replace a few components. I don’t want to pay $20 for the hand drawn schematics , I know what needs to be replaced I just cant find any info on the components.
both are three terminal
One labeled MSPS 4199 (some kind of transistor?)
One is labeled S2103
Pictures attached
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Rep: 781,3 mil
1,1 mil
892
2,3 mil
Aaron it will help if you can tell us the exact model of your receiver. The MSPS4199 is actually a Motorola SPS4199 and an equivalent for that would be a 2N4401 NPN Transistor - NTE123AP
As for the other component, a view of the complete PCB may help us further. It appears as it has been manufactured by Fairchild
Okay now we know this is reference designator Q205 (identical to Q305) and we know it is a Fairchild S2103 NPN transistor. I do not yet have a vintage catalog from Fairchild to find an equivalent, but have the schematic with the voltage on BCE of the transistor
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The Receiver is a Sherwood S-8500, it is a Fairchild component. I believe the FC component has the number 834 on it as well.
A 2N834 might just work for that.
Type Designator: 2N834
Material of Transistor: Si
Polarity: NPN
Maximum Collector Power Dissipation (Pc): 0.3 W
Maximum Collector-Base Voltage |Vcb|: 40 V
Maximum Collector-Emitter Voltage |Vce|: 30 V
Maximum Emitter-Base Voltage |Veb|: 5 V
Maximum Collector Current |Ic max|: 0.2 A
Max. Operating Junction Temperature (Tj): 200 °C
Transition Frequency (ft): 350 MHz
Collector Capacitance (Cc): 4 pF
Forward Current Transfer Ratio (hFE), MIN: 25
Noise Figure, dB: -
Rep: 2,3 mil
14
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The MSPS 4199 is a transistor. The other I think is another transistor but I’m not entirely sure.
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I looked for these numbers in Mouser but did not get a match. The S2103 looks to have 4 pins and where it is located seems to be related to the power supply, if so then a guess is it is a diode bridge.
The other component looks like a transistor, but do not know the type.
por DrGlowire
The MSPS 4199 is an old Motorola SPS transistor, Motorola SPS became Freescale Semiconductor which became NXP. This stuff is vintage, I haven't known mouser to carry a versatile selection of vintage stuff. By the pcb it may appear at first sight to be 4 pin, but i assure you it is 3 pin. You are correct about it being a power supply.
por Aaron