SYLVANIA RAYTHEON VT-179 Transoceanic Radio Loktal Vacuum 1LN5 2 Tubes

( Brand: Sylvania Raytheon ), ( Manufacturer Part Number: VT-179 ), ( Model: 1LN5 VT-179 ), ( Type: Vacuum Tube ), ( Country Of Origin: United States )

Review SYLVANIA RAYTHEON Vintage Tested Strong Transoceanic Radio Loktal Vacuum Tubes

The **Sylvania Raytheon VT-179 (1LN5) Transoceanic Radio Loktal Vacuum Tube** is a rare and highly sought-after artifact of early 20th-century radio technology, designed for long-distance communication in the golden age of wireless telegraphy. Part of the iconic **Loktal** series, this tube exemplifies the engineering prowess of the era, where precision and durability were paramount for transoceanic transmissions. The **VT-179 (1LN5)** is a **pentode power amplifier tube**, originally manufactured by **Sylvania Electric Products** (a division of Raytheon) under contract for military and commercial radio applications, particularly in high-power marine and aviation radio systems. Its **Loktal** designation refers to the unique **ceramic-metal construction** of its envelope, a revolutionary advancement that provided superior thermal conductivity and mechanical stability compared to traditional glass tubes. This construction method allowed the tube to handle the intense heat generated during prolonged high-power operation, making it ideal for long-range radio transmissions where reliability was critical.

Physically, the **VT-179 (1LN5)** features a **cylindrical ceramic body** with a **metallic base** that houses the internal filament, control grid, screen grid, suppressor grid, and plate (anode) electrodes. The tube s **direct-heated cathode** design, combined with its **pentode configuration**, enables efficient amplification of weak radio signals while minimizing distortion, a necessity for clear transoceanic communication. The **1LN5** designation follows the **1-series naming convention**, indicating its use in **low-voltage applications**, though it was capable of delivering substantial power output typically around **100 150 watts** when properly driven. Its **indirect-heated cathode** variant (the **VT-179A**) was also produced, offering improved longevity and performance in demanding environments.

Historically, the **VT-179 (1LN5)** was a staple in **WWII-era radio equipment**, particularly in **military and merchant marine vessels**, where its robustness and high-power output were essential for maintaining contact across vast oceanic distances. It was also employed in **early aviation radio systems**, where reliability under extreme conditions was non-negotiable. The tube s **Loktal construction** not only enhanced its thermal performance but also made it far less susceptible to mechanical shock a critical advantage in the harsh environments of naval and airborne operations. Over time, the **VT-179 (1LN5)** became a standard component in **high-frequency (HF) and medium-frequency (MF) radio transmitters**, where its ability to amplify signals with minimal loss was indispensable.

Today, the **Sylvania Raytheon VT-179 (1LN5)** is a prized collector s item among **vintage radio enthusiasts, ham radio operators, and historians of technology**. Its scarcity, combined with its historical significance, makes it a valuable piece for those restoring or recreating original **WWII-era radio equipment**. The tube s **ceramic Loktal envelope** is particularly striking, offering a tangible connection to the industrial ingenuity of mid-20th-century electronics. While modern solid-state components have largely replaced vacuum tubes in most applications, the **VT-179 (1LN5)** remains a testament to an era when **vacuum tube technology reigned supreme** in long-distance communication, embodying both the artistry and engineering of its time. For those seeking to preserve or revive the spirit of early radio technology, this tube is not merely a component it is a piece of history.

### **Pros and Cons of Buying Sylvania Raytheon VT-179 (1LN5) Transoceanic Radio Locktal Vacuum Tubes**

1. **Reliability and Durability** The VT-179 (1LN5) is a well-established vacuum tube known for its robustness in high-power radio applications, particularly in transoceanic communication systems. These tubes were designed for demanding environments, meaning they can handle sustained use without frequent failures.

2. **Compatibility with Legacy Systems** If you are restoring or maintaining vintage radio equipment (such as WWII-era transoceanic transmitters), these tubes are essential replacements. They fit seamlessly into older circuits where modern solid-state alternatives may not be available or practical.

3. **Superior Audio and Signal Quality** Vacuum tubes, particularly those designed for high-power RF applications, often produce cleaner and more linear amplification compared to some modern transistors in certain configurations. This can result in better audio fidelity in audio amplification applications.

4. **Historical and Collectible Value** For enthusiasts, restoring or operating original military-grade radio equipment can be a rewarding hobby. These tubes are part of a legacy of technology that played a crucial role in global communication during the mid-20th century.

5. **Availability of Replacement Parts** While not as common as consumer electronics components, these tubes can still be sourced from specialty suppliers, surplus markets, or tube repair services. Some manufacturers still produce compatible replacements, though sourcing may require effort.

6. **Long Lifespan with Proper Care** When operated within specified parameters and maintained correctly, these tubes can last decades. Proper filament heating, cooling, and avoiding overdrive can extend their operational life significantly.

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1. **High Cost** New or reconditioned VT-179 (1LN5) tubes can be expensive, especially if sourced from reputable suppliers. Prices may vary depending on demand, condition, and whether they are original or modern reproductions.

2. **Limited Availability** Unlike common audio tubes (e.g., 6L6, EL34), these tubes are niche components. Finding them may require searching through surplus auctions, eBay, or specialized tube dealers, which can be time-consuming.

3. **Sensitivity to Operating Conditions** Vacuum tubes are sensitive to voltage spikes, overheating, and improper filament operation. Running them outside their rated parameters can lead to premature failure or catastrophic damage (e.g., blown filaments or cathode degradation).

4. **Maintenance Requirements** Unlike plug-and-play solid-state components, vacuum tubes require periodic checks, such as ensuring proper filament voltage, cooling (if applicable), and grid bias settings. Neglecting maintenance can reduce performance or lifespan.

5. **Weight and Bulk** These tubes are physically large and heavy, which can be a drawback in modern, space-constrained setups. Installing or transporting them may require additional mechanical considerations.

6. **Skill Dependency** Operating or repairing equipment with these tubes often requires knowledge of vacuum tube principles, RF circuits, and sometimes even soldering or tube replacement techniques. Beginners may struggle without guidance.

7. **Environmental Sensitivity** Vacuum tubes can be affected by humidity, dust, or electrical interference in poorly shielded environments. Proper enclosure and shielding may be necessary for optimal performance.

8. **No Direct Consumer Support** Unlike modern electronics, there is no widespread consumer support for vacuum tube failures. Troubleshooting often relies on technical manuals, forums, or experienced hobbyists.

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The Sylvania Raytheon VT-179 (1LN5) is a high-quality, historically significant vacuum tube with strengths in reliability, signal integrity, and compatibility with vintage radio systems. However, its niche nature, cost, and maintenance demands make it less practical for casual users or modern applications. These tubes are best suited for **restoration projects, amateur radio enthusiasts with experience in tube-based equipment, or collectors preserving historical technology**.

If you are restoring a transoceanic radio transmitter or another high-power RF application where solid-state alternatives are unavailable, the VT-179 remains a worthwhile investment despite its challenges. For general audio amplification or modern applications, newer tube types or solid-state components may offer better convenience and cost-effectiveness.

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- **Buy if:** You are restoring or operating vintage radio equipment (e.g., WWII-era transoceanic transmitters), have experience with vacuum tubes, and are willing to invest in proper maintenance and sourcing.

- **Avoid if:** You are a beginner, seeking cost-effective modern solutions, or working on non-historical projects where solid-state components are feasible.

- For modern high-power RF applications, explore modern tube types (e.g., 4CX series) or solid-state RF amplifiers.

- For audio amplification, consider more widely available tubes like the 6146 or 3-500Z4.

- If sourcing is difficult, check for compatible modern reproductions or alternative tube types with similar characteristics.

Always verify the tube s condition (e.g., filament integrity, leaks) before purchase, and consult technical manuals or experts if unsure about installation or operation.

Details:

All Tubes Tested On A Precision 612 Calibrated Vacuum Tube Tester. Tube Pass All Test. Vacuum Tube Tested OD. All Tubes Are 30 Day Guaranteed.

Tube Tested At 96 With 100 Being New And 46 Low.

part #: vt179 prices

• $7.99-$60.00

specifications tubesocketvintagego:

• brand: Sylvania Raytheon
• mpn: Vt-179
• model: 1ln5 Vt-179
• type: Vacuum Tube
• country of origin: United States

shipping tubesocketvintagego:

• type: Calculated
• service: USPS Ground Advantage
• transit: 5-11 Days
• carrier: USPS
• class: Standard
• cost: $6.87

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offer tubesocketvintagego:

• started: March 1, 2026
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• quantity: 1
• options: Ship-to-home
• availability: In Stock

general tubesocketvintagego:

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

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• time: 30 Days
• policy: Returns Accepted
• method: Money back
• paid by: Buyer

seller tubesocketvintagego:

• city: Francesville, Indiana
• rating: 96.3%
• # reviews: 387

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