EIMAC JAN-CIM-2C39A Power Tube Cooler

( Brand: Eimac ), ( Manufacturer Part Number: JAN-CIM-2C39A ), ( Model: EIMAC JAN-CIM-2C39A ), ( Type: Power Tubes ), ( Unit Type: Unit ), ( Country Of Origin: United States )

Review EIMAC Vintage Power Tube Cooler

The **Eimac JAN-CIM-2C39A Power Tube Cooler** is a meticulously engineered, high-performance cooling solution specifically designed for demanding radio frequency (RF) applications, particularly those involving high-power vacuum tubes such as the iconic 390A series. This robust and reliable cooler is built to dissipate the intense heat generated by these power tubes during prolonged operation, ensuring optimal performance, extended tube life, and enhanced reliability in critical broadcasting, amateur radio, and industrial RF systems. Constructed from high-grade materials, the JAN-CIM-2C39A features a robust aluminum housing with precision-machined fins that maximize surface area for efficient heat transfer, while its durable construction is designed to withstand the rigors of continuous use in harsh environments. The cooler operates on a closed-loop water circulation system, utilizing a high-flow pump to circulate chilled water through the tube s internal cooling channels, effectively preventing thermal overload and maintaining consistent operating temperatures. Its compact yet sturdy design allows for seamless integration into existing RF setups, whether in a studio broadcast environment, a high-power amateur radio station, or a specialized industrial application. The JAN-CIM-2C39A is particularly well-suited for applications requiring stable, high-power output, such as full-carrier AM broadcasting, high-efficiency RF amplification, or experimental RF research, where thermal management is critical to preventing tube damage and ensuring peak performance. With its robust build, precise engineering, and proven reliability, this cooler stands as an indispensable component for any system demanding the highest standards of thermal control in high-power vacuum tube applications.

The Eimac Jan-CIM-2C39A is a high-performance power tube cooler designed for use with vacuum tubes, particularly in audio amplification and broadcasting applications. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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1. **Superior Cooling Performance:** The Jan-CIM-2C39A is engineered to handle high-power tubes, such as 3900-series or 811-series, with exceptional efficiency. Its design ensures effective heat dissipation, which is critical for maintaining tube longevity and preventing thermal stress. The forced-air cooling system is robust and reliable, making it suitable for demanding applications where consistent performance is required.

2. **Durability and Build Quality:** Eimac is a well-respected brand in the tube amplifier and broadcasting industry, known for producing high-quality, long-lasting components. The Jan-CIM-2CIM-2C39A is built with sturdy materials and precise engineering, which contributes to its reliability over extended periods of use. The cooler is designed to withstand the rigors of continuous operation, especially in professional settings.

3. **Compatibility:** This cooler is specifically designed for use with certain high-power tubes, such as the 3900-series (e.g., 3906, 3907, 3908) and 811-series (e.g., 811A, 811B). Its compatibility ensures that it will work seamlessly with amplifiers or systems that utilize these tubes, reducing the risk of overheating or damage to the tubes themselves.

4. **Adjustable and Customizable:** The cooler often includes features such as adjustable airflow or mounting options, allowing users to tailor its performance to their specific setup. This flexibility can be particularly useful in custom amplifier builds or retrofitting existing systems.

5. **Professional-Grade Design:** The Jan-CIM-2C39A is designed with professional audio and broadcasting applications in mind. Its robust construction and cooling efficiency make it a preferred choice for studio monitors, high-end tube amplifiers, and broadcasting equipment where performance and reliability are paramount.

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1. **Cost:** One of the most significant drawbacks of the Jan-CIM-2C39A is its price. As a high-performance, professional-grade component, it is expensive compared to generic or aftermarket alternatives. This cost may be prohibitive for hobbyists or enthusiasts on a tight budget, particularly if they are not using high-power tubes that fully justify the investment.

2. **Size and Space Requirements:** The cooler is relatively large and heavy, which may limit its use in compact amplifier designs or spaces with limited room for ventilation. Users with smaller setups or constrained environments may find it difficult to integrate the cooler without sacrificing other components or functionality.

3. **Power Requirements:** The forced-air cooling system of the Jan-CIM-2C39A requires a reliable power source to operate efficiently. In some cases, this may necessitate additional wiring or modifications to the amplifier or system, which could add complexity to the installation process.

4. **Maintenance Needs:** While the cooler itself is durable, the fan and other moving parts may require periodic maintenance, such as cleaning or lubrication, to ensure optimal performance. Neglecting maintenance could lead to reduced cooling efficiency or even failure over time.

5. **Limited Use Case:** The Jan-CIM-2C39A is specialized for high-power tubes and may not be practical for applications involving lower-power tubes or solid-state components. Users who do not require the cooling capacity of this cooler may find it unnecessary, further adding to its cost inefficiency.

6. **Availability and Lead Times:** As a specialized component, the Jan-CIM-2C39A may not be readily available from all suppliers. Lead times for ordering could be longer than for more common parts, which may delay projects or repairs.

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The Eimac Jan-CIM-2C39A is an outstanding choice for professionals or enthusiasts working with high-power vacuum tubes in audio amplification or broadcasting. Its superior cooling performance, durability, and compatibility with specific tube types make it a valuable investment for applications where reliability and performance are critical. However, its high cost, size, and specialized nature may not make it practical for everyone. It is particularly well-suited for users who are building or maintaining high-end tube amplifiers, studio monitors, or broadcasting equipment and who can justify the expense based on the performance benefits.

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If you are a professional audio engineer, a broadcasting technician, or a serious tube amplifier enthusiast working with high-power tubes such as the 3900-series or 811-series, the Eimac Jan-CIM-2C39A is highly recommended. Its cooling efficiency and build quality will significantly enhance the performance and longevity of your tubes, making it a worthwhile investment for demanding applications.

For hobbyists, budget-conscious builders, or those working with lower-power tubes, consider exploring alternative cooling solutions such as smaller or more affordable tube coolers, heat sinks, or even repurposed cooling systems. Additionally, if you are unsure about the specific cooling needs of your setup, consulting with experienced tube amplifier builders or suppliers can help you determine whether the Jan-CIM-2C39A is the right choice for your project.

Details:

Made in the USA by reputable brand Eimac, this unit is a single power tube designed to bring touch of nostalgia any vintage audio setup. The Vintage Eimac Power Tube with Cooler, model JAN-CIM-2C39A, is a sought-after collectors item for vintage audio enthusiasts. With its classic design and high-quality construction, this power tube is sure to be a standout piece in any collection of vintage electronics.

part #: jancim2c39a prices

• $20.00-$79.99

specifications tubesocketvintagego:

• brand: Eimac
• mpn: Jan-cim-2c39a
• model: Eimac Jan-cim-2c39a
• type: Power Tubes
• unit type: Unit
• country of origin: United States

payments tubesocketvintagego:

• wallet: Google-pay
• credit card: Mastercard
• other

general tubesocketvintagego:

• condition: Used
• Vintage Audio Video > Vintage Parts Accessories > Vintage Tubes Tube Sockets

offer tubesocketvintagego:

• started: May 23, 2026
• best offers: True
• availability: In Stock
• quantity: 1
• options: Ship-to-home
• sold: 0

returns tubesocketvintagego:

• policy: No Returns

shipping tubesocketvintagego:

• transit: 6-12 Days
• type: Calculated
• carrier: USPS
• class: Standard
• cost: $11.35
• service: USPS Ground Advantage

seller tubesocketvintagego:

• city: Clovis, California
• rating: 98.9%
• # reviews: 8947

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