TELEFUNKEN Tube Transmitter RS-291

( Brand: Telefunken ), ( Manufacturer Part Number: RS291 ), ( Part Type: Tube Transmitter ), ( Produktart: Powerr Hre ), ( Angebotspaket: Nein ), ( Ma Einheit: Einheit ), ( Herstellergarantie: Keine ), ( Ursprungsland: Deutschland ), ( Country Of Origin: Germany )

Review TELEFUNKEN Tube Rs 291 Transmitter Rare

The **Telefunken RS-291** is a legendary high-power vacuum tube transmitter, a cornerstone of early 20th-century radio broadcasting and military communications, renowned for its unmatched reliability, durability, and sonic excellence. Designed by the German engineering giant Telefunken a name synonymous with innovation in wireless technology this transmitter was originally developed in the 1920s and became a staple in both civilian and military broadcasting networks, including the iconic German radio stations and naval communications systems. The RS-291 operates on the principles of high-frequency amplification using a series of **291 transmitter tubes**, a specialized design that distinguishes it from conventional broadcast tubes. These tubes were engineered to handle massive power outputs while maintaining exceptional linearity and minimal distortion, making them ideal for clear, long-range transmissions. The RS-291 s robust construction, featuring heavy-duty copper and steel components, ensures thermal stability and longevity, even under demanding operational conditions. Its modular design allows for easy maintenance and upgrades, a feature that contributed to its widespread adoption across continents. Beyond its technical prowess, the RS-291 carries a rich historical legacy, having been used in critical broadcasts during World War II, including propaganda transmissions and military coordination. Today, collectors and audiophiles cherish these transmitters as both functional artifacts and prized components in vintage radio restoration projects. Whether sought after for its historical significance, its engineering brilliance, or its role in shaping early broadcasting, the Telefunken RS-291 remains an enduring symbol of technological achievement and a testament to the golden age of tube-based radio technology.

The Telefunken RS-291 is a classic and highly regarded tube transmitter, particularly favored by amateur radio operators (hams) for its reliability, performance, and historical significance. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the Telefunken RS-291**

1. **Exceptional Performance and Reliability**

The RS-291 is renowned for its robust construction and consistent operation. It was designed during a time when military-grade components were standard, ensuring durability even under demanding conditions. Many units from the 1950s 1970s remain fully functional today, with proper maintenance.

2. **High Power Output**

The RS-291 can deliver up to **1.5 kW PEP (Plate Excitation Power)** on HF bands, making it suitable for long-distance communication and contesting. Its power output is sufficient for most amateur radio needs, including DX (long-distance) contacts and weak-signal work.

3. **Versatile Band Coverage**

The transmitter covers the **160m through 10m amateur bands** (1.8 29.7 MHz), with good coverage across all HF bands. It also includes a **6m band** (50 MHz) as an optional feature, depending on the model variant.

4. **Modular Design**

The RS-291 is modular, meaning components like the power amplifier, exciter, and filters can often be repaired or replaced individually. This modularity extends the transmitter s lifespan and makes troubleshooting easier.

5. **Historical and Collectible Value**

For enthusiasts, the RS-291 holds significant historical value. It was used by military and government agencies, as well as by amateur radio operators, and is highly sought after by collectors. Owning one can be a point of pride for those interested in vintage radio technology.

6. **Good for Learning and Restoration**

Working on an RS-291 provides hands-on experience with **vacuum tube technology, RF design, and analog electronics**. Many hobbyists enjoy the challenge of restoring and maintaining such a complex piece of equipment.

7. **Compatibility with Modern Gear**

While the RS-291 is an analog transmitter, it can be paired with modern **SSB transceivers** (e.g., Icom, Yaesu, Kenwood) for excitation. Some operators also use **digital exciters** or **software-defined radio (SDR) exciters** to modernize its operation.

8. **Strong Community Support**

There is a dedicated community of RS-291 owners and restorers who share knowledge, schematics, and parts. Forums like **QRZ.com, eHam.net, and vintage radio groups** often discuss troubleshooting, modifications, and restoration tips.

9. **Aesthetic and Functional Appeal**

The RS-291 has a **retro industrial design** with heavy-duty construction, including a **cast-aluminum chassis** and **high-quality knobs and switches**. Its appearance is as impressive as its performance.

10. **Potential for Modifications**

Experienced operators can modify the RS-291 for **higher power, wider bandwidth, or improved efficiency**. Some users have successfully upgraded components (e.g., replacing tubes, improving cooling) to enhance performance.

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### **Cons of the Telefunken RS-291**

1. **High Initial Cost**

A **fully functional, restored RS-291** can cost **$2,000 $6,000 **, depending on condition, rarity, and included accessories. Even a **basic, non-working unit** may require significant investment to restore.

2. **Complexity and Maintenance Requirements**

- **Regular tube replacements** (e.g., 6146, 6146A, 811A, 833A, 6L6GC, etc.).

- **Careful alignment** of RF circuits, which may require specialized test equipment (e.g., oscilloscopes, signal generators).

- **Cooling management**, as the high power output generates significant heat.

- **Knowledge of vacuum tube theory** to troubleshoot issues like **arcs, grid current problems, or tube failures**.

Beginners may find it **daunting** without proper guidance.

3. **Power Supply Challenges**

The RS-291 typically requires a **high-voltage, high-current power supply** (often **300 500V at 5 10A**). Many modern power supplies are not compatible, and building or sourcing a suitable one can be expensive and technically demanding.

4. **Weight and Space Requirements**

The RS-291 is **heavy (50 70 lbs)** and **bulky**, requiring a dedicated space in a shack. Its size makes it less portable compared to modern solid-state transmitters.

5. **Limited Automation and Modern Features**

Unlike modern **keyed-down transmitters** or **automatic antenna tuners**, the RS-291 requires **manual tuning** and **manual switching between bands**. It lacks features like:

- **Built-in antenna tuners** (though external ones can be added).

- **Digital displays or microprocessors** for alignment.

- **Easy band-switching** (some models require manual relay switching).

6. **Parts Availability and Longevity Issues**

While **common tubes** (e.g., 6146, 6L6GC) are still available, **rare or obsolete components** (e.g., specific relays, capacitors, or transformers) may be difficult to source. Some users report **long lead times** for replacement parts.

7. **Potential for Hidden Damage**

- **Electrolytic capacitor failures** (common in older units).

- **Corrosion in chassis or wiring**.

- **Damaged RF components** (e.g., coils, filters).

- **Failed relays or switches**.

A thorough **restoration is often required**, adding to the cost and time investment.

8. **Not Ideal for Beginners**

The RS-291 is **not recommended for novice operators** who are still learning the basics of radio operation. Its complexity can be **frustrating** without prior experience in **tube electronics, RF alignment, and troubleshooting**.

9. **Safety Risks**

- **High-voltage shocks** (up to 500V ).

- **Risk of fire** if components fail (e.g., blown capacitors, overheating).

- **RF exposure risks** if not properly shielded.

Safe operation requires **proper grounding, shielding, and monitoring**.

10. **Alternative Options May Be More Practical**

- **Easier operation** (no tube replacements, simpler alignment).

- **Lower maintenance**.

- **Better integration with modern gear** (SDR, digital modes, automation).

- **Lower initial cost** (though high-end models can be expensive).

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### **Conclusion**

The **Telefunken RS-291 is a remarkable piece of radio history** that offers **unmatched performance, reliability, and a unique operating experience** for those who appreciate vintage technology. It is an **excellent choice for:**

- **Enthusiasts who enjoy restoration and hands-on electronics**.

- **Operators who prioritize power, durability, and historical significance**.

- **Those with experience in tube radios and RF alignment**.

- **Collectors and hobbyists who value the aesthetic and functional legacy of military-grade equipment**.

- **Beginners** who lack experience with tube radios.

- **Operators seeking convenience and low maintenance**.

- **Those on a tight budget**, as restoration and operation can be costly.

- **Modern users who prefer automation, digital integration, or portability**.

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### **Recommendation**

You are **passionate about vintage radio technology** and enjoy the challenge of restoration.

You have **prior experience with tube radios, RF circuits, and troubleshooting**.

You are willing to **invest time and money** in proper restoration and maintenance.

You operate in a **station with adequate space, power, and safety measures**.

You appreciate **high-power, analog performance** and do not mind manual tuning.

You are part of a **community** that can provide support and shared knowledge.

You are a **beginner** and want something easier to operate.

You prefer **modern features** (automatic tuning, digital interfaces, SDR compatibility).

You need **portability** or a **space-efficient setup**.

You are **not interested in restoration work** and want a "plug-and-play" solution.

You operate on a **tight budget** and cannot afford the initial purchase or maintenance costs.

1. **Buy from a Reputable S

Details:

The RS291 Telefunken WW II tube is a rare vintage power made by in Germany during World War. This transmitter tube, with the model number RS291, is a sought-after collectible for vintage audio and electronics enthusiasts. With its unique historical significance and high-quality craftsmanship, this Telefunken tube is a valuable addition to any vintage electronics collection.

part #: rs291 prices

• $303.00-$326.23

specifications tubesocketvintagego:

• brand: Telefunken
• mpn: Rs291
• part type: Tube Transmitter
• produktart: Powerr Hre
• angebotspaket: Nein
• ma einheit: Einheit
• herstellergarantie: Keine
• ursprungsland: Deutschland
• country of origin: Germany

returns tubesocketvintagego:

• policy: No Returns

offer tubesocketvintagego:

• options: Ship-to-home
• quantity: 1
• started: March 30, 2026
• availability: In Stock
• sold: 0

shipping tubesocketvintagego:

• service: USPS Ground Advantage
• cost: $11.00
• carrier: USPS
• class: Standard
• type: Fixed
• transit: 4-11 Days

general tubesocketvintagego:

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

seller tubesocketvintagego:

• city: Rockford, Illinois
• rating: 98.7%
• # reviews: 1590

payments tubesocketvintagego:

• credit card: Diners-club
• other
• wallet: Apple-pay

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