Transistor 2SB172 PNP, Germanium TO-1

Transistor 2SB172 PNP, Germanium TO-1

Transistors

Reference: TR2SB172

Part.No: 2SB172

€1.00

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The 2SB172 is a classic PNP Germanium Bipolar Junction Transistor (BJT) in a TO-1 metal can package. Purpose-built for vintage radio and amplifier repairs, offering authentic replacement performance for legacy audio and RF equipment.

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Description
Product Details

2SB172 Germanium PNP Transistor – Vintage Audio & Radio Restoration

The 2SB172 is a venerable PNP germanium transistor from the classic era of radio and audio amplification. Its soft, musical gain characteristics and natural distortion behavior make it a sought-after choice for restoring vintage equipment and designing warm, analog-sounding circuits.

Functions & Applications

Germanium Technology: Delivers warm, smooth gain and natural harmonic coloration prized in vintage audio.
PNP Polarity: Direct replacement for matching circuit topologies in classic equipment.
Rugged TO-1 Package: Metal can design, robust and easy to mount.
Low Vce(sat): Typical germanium forward drop (~0.3V) aids efficiency in legacy analog designs.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	PNP
Package / Case	TO-1
Collector-Emitter Voltage (Vceo)	15V
Semiconductor Material	Germanium
Mounting Type	Through-Hole (THT)

Frequently Asked Questions

Q: Is the 2SB172 suitable for modern breadboard circuits?
A: The 2SB172 is primarily designed for replacement in vintage equipment. Modern circuits typically use silicon BJTs (like BC557 PNP) for better temperature stability and predictability. However, hobbyists do use germanium transistors in retro-build projects.

Q: What is the complementary NPN germanium part?
A: The complementary NPN germanium transistor is the 2SA50 or 2SA99, depending on era and availability. Always verify datasheets for exact pinout and electrical equivalence.

Notes

Vintage germanium transistor, NOS (new old stock). Lower temperature stability and higher leakage compared to modern silicon devices. Requires careful biasing; collector leakage increases significantly with temperature. Ideal for hobbyist restoration and retro audio circuits only.

Note: Price refers to one (1) piece. The component is shipped in bulk without individual packaging.

Transistor Type: BJT (Bipolar Junction Transistor)
Transistor Polarity / Channel: PNP
Transistor Case Style: TO-1

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