WESTINGHOUSE GL-8513 Ge General Electric Transmitting Tube WL-8513 Power Triode Finned Heatsink

( Brand: Westinghouse ), ( Manufacturer Part Number: GL-8513 ), ( Model: WL-8513 ), ( Type: Transmitting Tube ), ( Unit Type: Unit ), ( Country Of Origin: United States )

Review WESTINGHOUSE Ge General Electric Transmitting Tube Power Triode Finned Heatsink

The **Westinghouse GL-8513 (GE General Electric Transmitting Tube, Power Triode with Finned Heatsink)** is a rare and highly sought-after piece of vintage radio and electronics history, embodying the engineering prowess of early 20th-century tube technology. Originally manufactured by Westinghouse Electric Corporation (later acquired by GE), this **power triode** was designed for high-power radio transmission applications, serving as a critical component in broadcast stations, amateur radio setups, and experimental wireless communication systems of its era. The GL-8513 is a **beam-power triode (PBT)**, featuring a **finned heatsink** to efficiently dissipate the substantial heat generated during operation, allowing it to handle significant power outputs typically in the range of **500 to 1,000 watts** depending on the circuit configuration and operating conditions. Its **glass envelope** houses a **thoriated tungsten filament**, a common design choice in early power tubes for durability and longevity, while the **beam power structure** (with its focused electron beam) enhances efficiency and reduces grid current, making it ideal for high-frequency transmission work.

Physically, the GL-8513 is a **large, imposing tube**, standing out among its contemporaries due to its robust construction and substantial size measuring roughly **12 to 14 inches in length** with a diameter of about **4 to 5 inches** at its widest point. The **finned heatsink** is a defining feature, consisting of **radial aluminum fins** designed to maximize surface area for heat dissipation, ensuring stable operation even under prolonged high-power conditions. The tube s **pin configuration** follows a **standard octal base**, though its internal wiring and electrode layout differ significantly from smaller signal tubes, reflecting its specialized role in power amplification. The **anode (plate)** is typically a **large, high-capacity electrode** capable of withstanding high voltages, while the **control grid and screen grid** are meticulously spaced to optimize beam focusing and amplification characteristics.

Beyond its technical specifications, the GL-8513 holds **historical significance** as a relic of the golden age of radio broadcasting, a time when vacuum tubes were the backbone of long-distance communication. It was commonly used in **transmitters for early AM radio stations**, **shortwave experimental setups**, and **military communications systems**, where reliability and power output were paramount. Collectors and restorers prize these tubes for their **rare availability**, as production ceased decades ago, and original specimens are increasingly difficult to locate in pristine condition. The GL-8513 s **vintage design** also makes it a fascinating subject for enthusiasts of **retro electronics**, offering a tangible connection to the technological advancements of the early to mid-20th century.

For those seeking to incorporate this tube into modern projects, the GL-8513 presents both **challenges and rewards**. Its **high power handling** makes it suitable for **high-voltage amplifier circuits**, **CW (continuous wave) transmitters**, or **experimental RF projects**, though it requires careful attention to **cooling, proper biasing, and high-voltage safety** due to its age and fragility. Replacement parts, such as **filaments, grids, or heatsinks**, are often scarce, necessitating either **restoration from a working specimen** or **careful sourcing from tube repair specialists**. When properly cared for, however, the GL-8513 can deliver **exceptional performance**, producing **crisp, powerful audio or stable RF output** that rivals many modern solid-state alternatives in certain applications.

In summary, the **Westinghouse GL-8513 GE power triode** is more than just a component it is a **piece of engineering heritage**, a testament to the innovation of an era when vacuum tubes ruled the airwaves. Whether admired for its **historical value**, sought after by **radio enthusiasts**, or utilized in **high-power experimental setups**, this tube remains a **captivating artifact** of a bygone technological age, bridging the gap between analog tradition and modern electronics.

The **Westinghouse GL-8513** (also known as the **GE General Electric Transmitting Tube Power Triode with a finned heatsink**) is a high-power vacuum tube used primarily in amateur radio transmitters, broadcast equipment, and vintage audio amplifiers. Below is a detailed analysis of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the Westinghouse GL-8513**

1. **High Power Handling**

The GL-8513 is a robust tube capable of handling significant power levels, often used in **100W to 1kW amateur radio transmitters** (depending on cooling and circuit design). This makes it suitable for high-power HF (High Frequency) operations, particularly in **linear amplifiers** or **final RF stages**.

2. **Durability and Longevity**

As a **hard-valve tube** (unlike modern solid-state components), the GL-8513 is built to last decades with proper care. Many examples from the 1950s 1970s remain operational today, especially when used in **dry-bias or grid-leak circuits** (avoiding excessive grid current).

3. **Wide Availability**

Due to its historical use in **military, broadcast, and amateur radio equipment**, the GL-8513 is relatively easy to source. It can be found in **eBay, tube forums, or surplus markets**, often at reasonable prices compared to rare modern tubes.

4. **Compatibility with Vintage Equipment**

The tube was widely used in **WWII-era and Cold War military radios**, as well as **early amateur radio gear** (e.g., **Hallicrafters, Drake, and Collins transmitters**). Restoring or modifying vintage equipment often requires this tube.

5. **Good for High-Voltage Applications**

It operates at **high anode voltages (typically 2.5kV 5kV)**, making it suitable for **long-range HF transmissions** where efficiency and power output are critical.

6. **Lower Cost Than Some Alternatives**

While not cheap, it is **less expensive than some modern high-power RF tubes** (e.g., **3-500Z, 4CX1500A**). For amateur radio users, it offers a balance between performance and cost.

7. **Mechanical Robustness**

The **finned heatsink** design helps with heat dissipation, though proper cooling (e.g., **forced air or liquid cooling**) is still necessary for sustained high-power operation.

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### **Cons of the Westinghouse GL-8513**

1. **Fragility in Handling**

Like all vacuum tubes, the GL-8513 is **sensitive to moisture, dust, and electrostatic discharge (ESD)**. Improper handling (e.g., touching the glass or metal parts) can lead to **internal shorting or failure**. It must be **baked out** (heated to remove moisture) before first use.

2. **Requires Proper Cooling**

Even with a finned heatsink, **high-power operation (above 500W) demands additional cooling** (e.g., **blower, liquid cooling, or extended heatsink fins**). Without adequate cooling, the tube can **overheat and fail prematurely**.

3. **Grid Current Sensitivity**

The GL-8513 is a **triode**, meaning it can suffer from **excessive grid current** if misused (e.g., **incorrect bias, improper drive, or RF feedback**). This can lead to **grid filament shorts**, which are difficult to repair.

4. **Limited Modern Support**

Unlike modern transistors or solid-state components, **troubleshooting and replacement parts are scarce**. If the tube fails, **rebuilding or sourcing a replacement can be challenging** compared to modern electronics.

5. **High Voltage Hazards**

Operating at **kilovolts (kV)**, the GL-8513 poses a **serious electrical hazard**. Proper **insulation, grounding, and safety precautions** (e.g., **high-voltage gloves, test probes**) are **mandatory** to avoid fatal shocks.

6. **Not Ideal for Low-Power or Modern Applications**

While it excels in **high-power RF**, it is **overkill for low-power use** (e.g., audio amplifiers). Modern **SSB (Single Sideband) or CW (Morse Code) transmitters** often use **more efficient solid-state alternatives** for convenience.

7. **Weight and Bulk**

The tube is **heavy and physically large**, requiring **secure mounting** in a chassis. This can be a drawback in **portable or compact builds**.

8. **Potential for Microphonic Noise**

If not properly **de-gassed** or **secured**, the tube can introduce **microphonic noise** (audible hum in audio applications), though this is less of an issue in RF transmitters.

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### **Conclusion**

The **Westinghouse GL-8513** is a **powerful, durable, and historically significant tube** that remains relevant for **high-power amateur radio, vintage equipment restoration, and broadcast applications**. Its **high power handling, longevity, and compatibility with classic gear** make it a **valuable component** for enthusiasts. However, its **fragility, high-voltage risks, and cooling requirements** demand **careful handling and proper setup**.

- **Linear amplifiers** (e.g., **100W 1kW HF rigs**)

- **Restoring vintage transmitters** (e.g., **WWII-era military radios**)

- **High-power CW or SSB operation** where efficiency is critical

For **casual users or low-power applications**, **modern solid-state alternatives** (e.g., **IRF transistors, LDMOS devices**) may be **more practical** due to **ease of use, reliability, and safety**.

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### **Recommendation**

You are **restoring or modifying vintage radio equipment** (e.g., **Hallicrafters SX-100, Collins 75S-1**).

You are **building a high-power amateur radio linear amplifier** (e.g., **1kW HF rig**).

You have **experience with high-voltage tubes** and proper **cooling/ventilation** setup.

You are willing to **invest time in proper handling, baking, and maintenance**.

You are a **beginner** with limited experience in **high-voltage electronics**.

You need a **compact, low-power, or modern solution** (solid-state is safer).

You cannot provide **adequate cooling** (e.g., **blower, liquid cooling**).

You are not prepared for **potential repair challenges** (e.g., grid shorts).

The GL-8513 is a **fantastic choice for dedicated ham radio operators and vintage gear enthusiasts** who prioritize **performance and historical authenticity**. However, it is **not a beginner-friendly component** and requires **respect for high-voltage safety**. If you are serious about **high-power RF work**, it remains one of the best **mechanical triode options** available. For most other applications, **modern solid-state components** offer a safer and more convenient alternative.

Details:

For parts or rebuild sold as is. Vintage Westinghouse WL-23491 Transmitting Tube Power Triode w/ Finned Heatsink.

part #: gl8513 price

• $331.55

specifications hamamateuradio:

• brand: Westinghouse
• mpn: Gl-8513
• model: Wl-8513
• type: Transmitting Tube
• unit type: Unit
• country of origin: United States

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• rating: 100.0%
• # reviews: 8828
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• condition: For parts or not working
• Vintage Audio Video > Vintage Parts Accessories > Vintage Tubes Tube Sockets

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• started: April 8, 2026

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