Transistor AC187 NPN Germanium, TO-1

Transistor AC187 NPN Germanium, TO-1

Transistors

Reference: TRAC187

Part.No: AC187

€1.20

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The AC187 is a vintage NPN Germanium Bipolar Junction Transistor (BJT) in a TO-1 metal can package. A legendary component in classic audio amplifiers and output stages, prized for its warm, natural tone and complementary pairing with the AC188.

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Description
Product Details

AC187 Vintage Germanium Transistor - Authentic Audio Stage Replacement

The AC187 is a legendary NPN germanium transistor, widely used in vintage audio amplifiers and output stages since the 1960s. Its warm, natural frequency response and low-noise characteristics make it the preferred choice for restoring or building authentic tube-like amplification circuits.

Functions & Applications

Germanium Construction: Delivers the warm, natural tone characteristic of vintage audio circuits.
Complementary Pair: Often used with AC188 in push-pull output stages for balanced amplification.
TO-1 Metal Can: Robust, authentic packaging typical of classic audio-grade components.
Low Noise: Ideal for high-impedance preamplifiers and sensitive audio stages.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-1
Mounting Type	Through-Hole (THT), Metal Can

Frequently Asked Questions

Q: What is the complementary PNP pair for the AC187?
A: The AC188 is the complementary PNP germanium transistor, designed to work alongside the AC187 in balanced push-pull output stages.

Q: Can I replace AC187 with modern silicon transistors?
A: Direct replacement with silicon (e.g., 2N3055) requires significant circuit modification due to different forward voltage and thermal characteristics. For authentic vintage restoration, original germanium AC187 is strongly recommended.

Notes

Vintage NOS (New Old Stock) germanium transistor. Performance and gain may vary between individual units due to age and storage conditions. Recommended for audio enthusiasts and vintage equipment restoration.

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: NPN
Transistor Case Style: TO-1

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