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Ten-Tec Part Number 81-040 Roller Inductor for the 238 & 238B Antenna Tuner 0.1–19 µH NEW in Box

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MPN:
81-040
Condition:
New
Shipping:
$7.00 (Fixed Shipping Cost)
  • Ten-Tec Part Number 81-040 Roller Inductor for the 238 & 238B Antenna Tuner 0.1–19 µH NEW in Box
  • Ten-Tec Part Number 81-040 Roller Inductor for the 238 & 238B Antenna Tuner 0.1–19 µH NEW in Box
  • Ten-Tec Part Number 81-040 Roller Inductor for the 238 & 238B Antenna Tuner 0.1–19 µH NEW in Box
  • Ten-Tec Part Number 81-040 Roller Inductor for the 238 & 238B Antenna Tuner 0.1–19 µH NEW in Box
$89.99
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Description

Ten-Tec Part Number 81-040 Roller Inductor for the 238 & 238B Antenna Tuner 0.1–19 µH NEW in Box

 

Ten-Tec Part/Model 81-040 is a roller inductor (variable coil) component, specifically a silver-plated unit with an inductance range of 0.1–19 µH (microhenries). It was a spare/replacement part sold by Ten-Tec, primarily used in their Model 238 & 238B Antenna Tuner (a popular 2 kW HF roller inductor tuner from the 1980s–1990s, known for its robust T-match design with vacuum variables and roller for smooth, high-power matching across HF bands).This part number appears in Ten-Tec's historical parts/accessories lists (e.g., from 2005 price sheets and unofficial archives like QSL.net/TenTec pages). It's not a standalone consumer product but a factory-original component for repairs, builds, or custom projects (e.g., homebrew tuners or restoring Ten-Tec 238s). Roller inductors like this are prized for low loss, high Q, and power handling in antenna matching networks.Key Details and Specifications
  • Inductance Range: 0.1–19 µH (variable via roller wheel/turns counter).
  • Construction: Silver-plated coil for minimal resistance and high efficiency; commercial-grade (likely Cardwell or similar OEM, rebranded for Ten-Tec).
  • Power Rating: Compatible with the Model 238's 2 kW PEP rating (suitable for high-power HF use).
  • Era: Available as a spare part in the 1990s–2000s (Ten-Tec sold these directly for service/repairs).
  • Build: Includes shaft for turns counter coupling, mounting hardware points; compact coil assembly (typically 2–3" diameter coil form).

 

 

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