TELEFUNKEN Globe Tube Plates RGN504 1930S 1801/G504/KL73302/G430/PV430

( Brand: Telefunken ), ( Manufacturer Part Number: KL73302 ), ( Model: RGN504/1801/G504/KL73302/G430/PV430 ), ( Type: Rectifier ), ( Country Of Origin: Germany )

Review TELEFUNKEN 1930s Globe Tube 1801/g504/kl73302/g430/pv430 Silver Plates

The Telefunken KL73302 from the 1930s is a rare and highly sought-after relic of early radio and broadcasting technology, embodying the ingenuity of German engineering during the golden age of vacuum tube innovation. This particular model, identified by its distinctive **RGN504 globe tube** designation (also referenced as **1801/G504, KL73302, G430, or PV430 plates**), represents a sophisticated power amplifier tube designed for high-fidelity audio amplification, broadcasting, and early television applications. Crafted with meticulous precision, the KL73302 features a robust **glass envelope** with a **cylindrical or slightly tapered design**, often adorned with Telefunken s iconic **black-and-white or blue-and-white branding** near the base, a hallmark of its era. Inside, the tube houses a **pentode or beam-power tetrode configuration**, utilizing **indirectly heated oxide-coated cathodes** for longevity and efficiency, paired with **thoriated tungsten filaments** that emit electrons when heated to incandescence. The **G504 grid structure** is engineered to minimize grid current while maximizing gain, making it ideal for driving high-power output stages in radio transmitters, public address systems, and early sound-on-film projection setups.

The KL73302 s **plate assembly** whether labeled **G430 or PV430** consists of **multiple anodes (plates)** strategically positioned to optimize voltage distribution and reduce arcing, a common issue in high-power tubes of the time. The **beam-forming plates** within the tube help focus the electron stream toward the anode, enhancing efficiency and reducing distortion, a critical feature for clear, undistorted audio reproduction in broadcasting. The tube s **pin configuration** (typically a **9-pin or 12-pin base**, depending on variant) is designed for secure mounting in chassis, with **heavy-duty leads** to handle the substantial current draw required for its intended applications. Historically, the KL73302 was favored in **broadcast studios, military communications, and early television transmitters** due to its ability to deliver **high power output with minimal harmonic distortion**, a rarity in its time.

Today, the Telefunken KL73302 remains a prized collector s item among vintage electronics enthusiasts, ham radio operators, and audio restoration specialists. Its **mechanical robustness**, combined with its **sonic purity**, makes it a favorite for rebuilding classic amplifiers, restoring vintage radio transmitters, or even experimenting with DIY audio projects. The tube s **vintage aesthetics**, paired with its **technical sophistication**, offer a tangible connection to the era when radio was revolutionizing global communication. Whether displayed as a historical artifact or repurposed in a modern setup, the KL73302 stands as a testament to Telefunken s legacy of **precision, durability, and innovation** a relic of an age when electronics were both art and science.

### **Pros and Cons of Buying a Telefunken KL73302 (1930s RGN504 Globe Tube, 1801/G504/KL73302/G430/PV430 Plates)**

#### **Pros**

1. **Historical and Collectible Value**

The Telefunken KL73302 is a rare and iconic tube from the early 20th century, particularly valued by vintage electronics enthusiasts, collectors, and audiophiles. Its historical significance makes it a unique addition to any collection.

2. **Superior Sound Characteristics (for its era)**

Telefunken tubes, especially those from the 1930s, were known for their high-quality sound reproduction. The KL73302 was designed for broadcast and high-fidelity applications, offering warm, detailed, and natural tonal qualities compared to later mass-produced tubes.

3. **Compatibility with Vintage and High-End Audio Equipment**

This tube was used in professional broadcast equipment, high-end amplifiers, and early sound systems. It can be retrofitted into modern or vintage amplifiers that use similar power tube designs (such as 6L6, 6550, or EL34 variants), though exact replacements may require modifications.

4. **Aesthetic and Technical Appeal**

The globe tube design (with its distinctive glass envelope) is visually striking and represents early tube technology. For those interested in the evolution of electronics, this tube offers a tangible piece of history.

5. **Potential for Restoration and Modification**

Since these tubes are no longer in mass production, restoring or modifying them can be a rewarding project. Some enthusiasts enjoy the challenge of bringing vintage components back to working order.

6. **Investment Potential**

As rare and well-preserved examples become scarcer, the value of this tube may appreciate over time, making it a potential long-term investment for collectors.

---

#### **Cons**

1. **Extreme Rarity and High Cost**

Finding a working KL73302 in good condition is difficult, and prices can be prohibitively expensive often hundreds or even thousands of dollars for a single tube, depending on its condition and provenance.

2. **Lack of Modern Availability**

Unlike common tubes like the 6L6 or EL34, the KL73302 is not manufactured today. This means no replacements are available if the tube fails, and sourcing a functional unit requires relying on secondary markets (eBay, collectors, or specialized dealers).

3. **Compatibility Challenges**

While the KL73302 shares some characteristics with modern power tubes (e.g., similar voltage and current ratings), it is not a direct drop-in replacement. The glass envelope, pin configuration, and internal construction differ significantly from contemporary tubes, requiring careful adaptation in circuits.

4. **Fragility and Handling Risks**

Vintage globe tubes are delicate. The glass envelope can crack if mishandled, and the internal components (filaments, electrodes) may degrade over time. Proper storage and handling are essential to prevent damage.

5. **Limited Performance in Modern Systems**

While the KL73302 may sound excellent in vintage or properly adapted systems, its performance in modern amplifiers may not justify the cost or effort required for integration. Many modern tubes (e.g., certain EL34 variants) offer similar power and sound characteristics at a fraction of the price.

6. **Maintenance and Testing Difficulties**

Testing and repairing these tubes requires specialized knowledge. If the tube fails, diagnosing the issue (e.g., filament burnout, grid issues) can be complex, and restoration may not always be feasible.

7. **Ethical and Conservation Concerns**

Some collectors argue that purchasing rare vintage tubes contributes to the depletion of historical artifacts. Ethical considerations may arise if the tube is irreplaceable or part of a limited surviving population.

---

### **Conclusion**

The Telefunken KL73302 is a fascinating and historically significant tube, ideal for collectors, audiophiles with deep pockets, and those with a passion for vintage electronics. Its unique sound, rarity, and aesthetic appeal make it a prized possession for the right buyer. However, its extreme cost, lack of availability, and compatibility issues with modern equipment limit its practical use for most audio applications.

If your primary goal is **sound quality in a modern amplifier**, a modern or slightly vintage replacement tube (e.g., a high-end EL34, 6550, or Telefunken s own modern equivalents like the 6556) may offer similar performance at a fraction of the cost. If, however, you are driven by **collectibility, historical interest, or the challenge of working with rare components**, the KL73302 remains a compelling (if expensive) acquisition.

### **Recommendation**

- **Buy if:** You are a serious collector, have the budget to invest in rare tubes, and are willing to undertake the challenges of compatibility and maintenance. Alternatively, if you are restoring vintage equipment where this tube was originally used.

- **Avoid if:** You need a reliable, affordable power tube for modern audio applications. In such cases, prioritize modern or slightly newer vintage tubes that offer similar performance with greater availability and lower cost.

- **Alternative Approach:** Consider purchasing a **modern Telefunken tube** (e.g., the 6556 or 6L6 clone) if you admire Telefunken s sound but cannot justify the price of a 1930s original. For audiophiles, tubes like the **GZ34** or **EL34 variants** may provide a better balance of performance and practicality.

Details:

This is a full wave rectifier tube that known by many other designations, including. This tube has been tested and its got plenty of useful life left. 1801/G504/KL73302/G430/PV430. The tube is free of leaks, shorts, and quality/emissions issues.

This is one of the very early Tofu globes with eight sided star logo printed on top. This listing is for a rare Telefunken globe type RGN504 with welded, silver chrome plates and side foil fetter hanging off the top that was made in early 30s, this pre-war tube eight sided star logo on.

part #: kl73302 prices

• $58.04-$147.50

specifications tubesocketvintagego:

• brand: Telefunken
• mpn: Kl73302
• model: Rgn504/1801/g504/kl73302/g430/pv430
• type: Rectifier
• country of origin: Germany

offer tubesocketvintagego:

• sold: 0
• quantity: 1
• options: Ship-to-home
• availability: In Stock
• started: April 21, 2026
• best offers: True

returns tubesocketvintagego:

• policy: No Returns

shipping tubesocketvintagego:

• carrier: USPS
• service: USPS Ground Advantage
• type: Calculated
• class: Standard
• transit: 4-10 Days
• cost: $6.31

payments tubesocketvintagego:

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

general tubesocketvintagego:

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

seller tubesocketvintagego:

• rating: 99.7%
• # reviews: 1021
• city: Grand Rapids, Michigan

Telefunken KL73302 Is Similar To:

• 12au6 Vintage Strong Tube Telefunken Very Stereo 9 (23.7% similar) ...(January 7th, 2015)
• 12ax7aecc83 Telefunken Tube Pieces (31.9% similar) ...(September 18th, 2018)
• Wwii 12p35 Transmitting Telefunken Tube Rl Wehrmacht (31.9% similar) It is reliable as I have never lost a tube. Made in germany. I will combine shipping. The filament is continuous. I pack utilizing tested deceleration techniques which yields a tremendous survival rate. You are buying on a Telefunken rl 12P35 Wehrmacht 35 watt used transmitting tube. Thus it appears...(February 2nd, 2015)
• Ecc83 Balanced Very 1610umhos 1560 1.1 12ax7 Ribbed Strong Telefunken Plates (21.1% similar) Telefunken 12AX7 tested on our new proprietary tester, the E3444 triplet west more it's a triplet west more 501 that has been enhanced. Filament voltage is also controlled. Tubes can be accurately matched for gm plate current at the manufacturer's specified test points or at other specified test ...(February 28th, 2015)
• 1920 2160umhos Telefunken Vintage 12au7 Ecc82 Tube (28.1% similar) Filament voltage is also controlled. This tester was prepared by Mr. 0MA results hos this tester uses regulated power sources for the bias, plate, screen voltage s, as well modified operating testing procedures. Tubes are tested in accordance with the manufacturers specifications measurements ...(December 27th, 2016)
• Siemens Stereo 232332121 Ef80 Vintage 6bx6 Telefunken Tube (21% similar) ...(February 8th, 2015)
• Ucc85 Tube 26aq8 Box Telefunken Vintage Nos (23.1% similar) ...(March 7th, 2015)
• 6508-a Telefunken Nos Tung Sol Tube (35% similar) Produced in 1963 by Ting-sol for wheel co. I can find a second-hand box for it. This 6508 valve is unused, still displaying warning label. See other offers for more radio, broadcast audio, music stuff. Bid with your overall costs in mind. Pin base with metal jumper across two of the pins, as seen...(March 2nd, 2017)
• 6922-cca-e88cc Telefunken Military Gold Pin Tube (30.1% similar) ...(January 9th, 2019)
• Ribbed Tube 69361 12ax7 1160 Plts Stereo Ecc83 1210 Vintage Telefunken (12.9% similar) ...(March 1st, 2015)
• Telefunken Tube 6au6 Vintage (33.3% similar) Tested on a b k 707 tester to be 103. For your consideration is a 6AU6 EF94 Telefunken tube remove from one of our fisher receivers...(January 24th, 2015)