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An audio/video receiver (AVR or home audio receiver) is a consumer electronics component used in home theaters that convert signals into sound.

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Can anyone help me identify these components?

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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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.

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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.

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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

Update (03/13/2019)

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.

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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: -

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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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Aaron さん、ありがとうございました!
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