Transistor AF139 PNP, Germanium UHF TO-72

Transistor AF139 PNP, Germanium UHF TO-72

Transistor AF139 PNP, Germanium UHF TO-72

Transistor AF139 PNP, Germanium UHF TO-72

Transistor AF139 PNP, Germanium UHF TO-72

Transistors

Reference: TRAF139

Part.No: AF139

€1.20

In Stock

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The AF139 is a vintage PNP germanium transistor in a shielded TO-72 package, purpose-built for UHF amplification in RF and television tuner circuits. A legendary part from the golden age of analog TV, prized by vintage electronics restorers and RF enthusiasts.

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Description
Product Details

AF139 Vintage Germanium Transistor – Classic UHF RF Amplifier for Tube TV Restoration

The AF139 is a legendary PNP germanium transistor engineered for high-frequency amplification in UHF tuner stages of 1960s–70s televisions. Its shielded four-lead package and carefully balanced internal geometry made it the industry standard for low-noise, stable RF amplification at frequencies approaching 1 GHz—the practical limit of germanium BJTs.

Functions & Applications

Shielded Four-Lead Package: Built-in grounding shield eliminates unwanted oscillations and feedback at UHF frequencies.
Germanium Chemistry: Naturally lower noise figure and softer gain roll-off than early silicon equivalents; prized by vintage RF purists.
UHF-Optimized Design: Engineered for stability and linearity in antenna amplifiers and TV tuner frontends.
Vintage Authenticity: Original stock, essential for period-correct restoration of 1960s–70s television receivers.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	PNP
Package / Case	TO-72
Collector-Emitter Voltage (Vceo)	25V
Max Collector Current (Ic)	50mA
Transition Frequency (fT)	~600MHz
Mounting Type	Through-Hole (THT), Shielded

Frequently Asked Questions

Q: What can replace an AF139 in a vintage TV tuner?
A: The AF139 has limited drop-in replacements due to its optimized UHF characteristics. Later silicon UHF transistors (e.g., BFR93, 2N4957) can work but may require tuning adjustments. For authentic restoration, original AF139 stock is strongly preferred.

Q: Is the AF139 ESD-sensitive or fragile?
A: Germanium transistors are generally robust to static discharge compared to modern MOSFET/CMOS, but handle with normal precautions. The shielded package provides good internal protection.

Notes

Vintage NOS (New Old Stock) germanium part from the analog television era. AF139 units are increasingly scarce; this is prime collector material for tube/transistor radio and TV restoration projects. Store in a cool, dry environment to preserve long-term stability.

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-72

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