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  3. WESTINGHOUSE H-507

WESTINGHOUSE Pin Electrometer Triode Tube RH-507

Rh-507 Westinghouse H-507 Rare Early Large Pin Electrometer Triode Tube

( Brand: Westinghouse ), ( Manufacturer Part Number: H-507 ), ( Type: Vacuum Tube ), ( Unit Type: Unit ), ( Country Of Origin: United States )

Review WESTINGHOUSE Rare Early Large Pin Electrometer Triode Tube

The **Westinghouse H-507/PIN Electrometer Triode (RH-507)** is a meticulously engineered vacuum tube designed for high-precision applications in electrometer circuits, where exceptional sensitivity, stability, and low noise are paramount. Part of Westinghouse s renowned line of specialized tubes, the H-507/PIN is a **pin-diode triode** a hybrid structure combining the controlled conduction of a triode with the fast, high-sensitivity response of a PIN photodiode, making it ideal for ultra-low-level signal detection, ionization chamber measurements, and high-impedance amplification stages. Its construction features a **glass envelope** with carefully positioned electrodes to minimize stray capacitance and maximize signal integrity, while the internal **thoriated tungsten cathode** ensures a long operational lifespan with consistent emission characteristics. The tube s **grid-controlled triode section** provides precise modulation of the electron stream, enabling fine-tuning of gain and response time, whereas the **PIN diode section** at the anode end delivers rapid, linear detection of minute currents often in the picoampere range without the thermal noise associated with resistive sensors. This dual functionality makes the H-507/PIN particularly valuable in scientific research, nuclear instrumentation, and high-precision industrial metrology, where even the slightest variations in current must be accurately measured. The tube s **low noise floor** and **high input impedance** (often exceeding 10 ohms) allow it to interface seamlessly with delicate sensors, such as Geiger-M ller counters, ionization chambers, or photomultiplier preamplifiers, where signal integrity is critical. Additionally, its **robust construction** and **minimal outgassing** ensure reliability in both laboratory and field environments, making it a trusted component in legacy and modern analog signal processing systems. Whether used in vintage test equipment, radiation detection setups, or early computer peripherals, the Westinghouse H-507/PIN remains a testament to the precision engineering of mid-20th-century electronics, offering unmatched performance for those demanding the utmost in sensitivity and stability.

**Pros and Cons of Buying a Westinghouse H-507 Pin Electrometer Triode (RH-507 Tube)**

The Westinghouse H-507 (also known as the RH-507) is a specialized vacuum tube used primarily in electrometer circuits, high-impedance amplifiers, and precision measurement applications. Below is a detailed analysis of its advantages and disadvantages.

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### **Pros**

1. **High Precision and Sensitivity**

The H-507 is designed for electrometer applications, meaning it excels at detecting extremely small currents (in the picoampere range) and voltages. Its high input impedance (often in the megohm range) makes it ideal for measuring weak signals without significant loading effects. This precision is invaluable in scientific research, medical equipment, and high-end audio applications where signal integrity is critical.

2. **Low Noise Characteristics**

Compared to many other vacuum tubes, the H-507 is relatively low-noise for its class, which is essential in applications where signal clarity is paramount. This makes it suitable for use in sensitive measurement systems where noise could distort results.

3. **Long-Term Stability**

Vacuum tubes, including the H-507, generally exhibit excellent long-term stability compared to solid-state components in certain applications. Once properly aged and warmed up, the tube can maintain consistent performance over extended periods, which is beneficial for laboratory or industrial equipment where reliability is key.

4. **Compatibility with Older Systems**

The H-507 is a well-documented tube, and its pin configuration (pin layout) is standardized, making it easier to integrate into vintage or retrofitted equipment. Many older scientific instruments, audio amplifiers, and measurement devices were designed with tubes like this in mind, so sourcing replacements or building custom circuits around it can be straightforward.

5. **Unique Sound Characteristics (for Audio Applications)**

In high-end audio amplifiers, certain vacuum tubes are prized for their "warmth" and "musicality." While the H-507 is not a power amplifier tube, it can be used in preamplifier or signal-processing stages to add subtle harmonic richness to audio signals. Enthusiasts in the tube audio community sometimes use it in experimental setups for this reason.

6. **Durability and Robustness**

Vacuum tubes are generally more robust than many solid-state components in terms of handling transient voltage spikes or electrical surges, provided they are used within their rated parameters. The H-507, being a specialized tube, is built to handle high-impedance applications without failure.

7. **Educational and Collectible Value**

For hobbyists or collectors interested in vacuum tube technology, the H-507 is a fascinating piece of history. It offers a tangible connection to early 20th-century electronics and can be a valuable addition to a tube collection. Additionally, studying its operation can provide deeper insights into electrometer circuits and high-impedance design.

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### **Cons**

1. **High Cost and Limited Availability**

The H-507 is not a mass-produced tube, and its specialized nature means it is often more expensive than common audio or power tubes. Prices can vary widely depending on condition, age, and demand, but even new or reconditioned units may be costly compared to solid-state alternatives. Availability can also be an issue, as it is not manufactured by major tube companies today. Buyers may need to rely on vintage stock, eBay, or specialized tube suppliers, which can add to the expense and uncertainty.

2. **Fragility and Handling Requirements**

Vacuum tubes are delicate components. The H-507, like all tubes, can be damaged by static electricity, physical shock, or improper handling. Glass tubes are particularly susceptible to breakage, and metal tubes (if available) may still require careful handling to avoid damage to the filament or electrodes. This fragility adds an extra layer of care during purchase, storage, and installation.

3. **Requires Proper Aging and Warm-Up**

New or unused H-507 tubes often require a period of aging (typically several hours to days) to stabilize their performance. This process involves operating the tube under controlled conditions to burn in the filament and electrodes, ensuring consistent operation. Skipping this step can lead to erratic behavior or premature failure. Additionally, tubes require a warm-up period before achieving optimal performance, which can be inconvenient in applications where immediate operation is needed.

4. **Limited Lifespan and Maintenance**

While vacuum tubes are durable, they do have a finite lifespan, often measured in thousands of hours of operation. The H-507, like all tubes, will eventually fail due to filament evaporation, electrode degradation, or other wear-and-tear mechanisms. This means that any equipment relying on it will require eventual replacement, adding long-term maintenance costs. Unlike solid-state components, tubes cannot be easily repaired once failed; they must be replaced.

5. **Power Consumption and Heat Generation**

The H-507, like all vacuum tubes, consumes power and generates heat. While it is not a high-power tube, its operation requires a filament voltage (typically around 6.3V AC or DC) and a plate (anode) voltage, which adds to the overall power draw of a circuit. This can be a consideration in battery-powered or low-power applications. Additionally, the heat generated may require additional cooling or thermal management in enclosed systems.

6. **Complexity in Circuit Design**

Using the H-507 in a circuit requires a good understanding of vacuum tube principles, including proper biasing, voltage supply requirements, and heat dissipation. Unlike plug-and-play solid-state components, designing or modifying a circuit to incorporate this tube may require additional expertise, especially for those unfamiliar with high-impedance or electrometer applications. This can be a barrier for hobbyists or DIY enthusiasts without a strong electronics background.

7. **Compatibility Issues with Modern Systems**

While the H-507 can be used in modern systems, its high impedance and specialized nature may not align well with contemporary circuit design practices, which often favor low-impedance, high-frequency solid-state components. Integrating it into a modern setup may require additional components (e.g., transformers, resistors, or coupling capacitors) to ensure proper operation, adding complexity and cost.

8. **Environmental Sensitivity**

Vacuum tubes can be sensitive to environmental factors such as humidity, dust, or electrical interference. The H-507, being an electrometer tube, is particularly sensitive to stray electrical fields or noise, which can affect its accuracy in measurement applications. Proper shielding and grounding may be necessary to ensure reliable performance.

9. **Limited Output Capability**

The H-507 is not a power amplifier tube; its primary role is in signal detection or amplification at very low current levels. If you need a tube for driving speakers or high-power applications, this tube is not suitable. Its output is typically used for further processing or measurement rather than direct amplification.

10. **Ethical and Environmental Concerns**

Vacuum tubes, especially older ones, may contain materials that are difficult to recycle or dispose of responsibly. Additionally, sourcing vintage tubes can sometimes involve ethical dilemmas, such as purchasing from collectors who may have acquired the tube through unclear means. Buyers should be mindful of these considerations when acquiring the H-507.

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### **Ending Conclusion**

The Westinghouse H-507 (RH-507) is a highly specialized and capable vacuum tube, particularly well-suited for electrometer applications, high-impedance amplification, and precision measurement tasks. Its strengths lie in its sensitivity, stability, and compatibility with vintage or specialized equipment. For hobbyists, collectors, or professionals working in fields where vacuum tube technology is still relevant (such as audio restoration, scientific instrumentation, or retrofitting old devices), the H-507 can be an excellent choice.

However, its drawbacks including high cost, limited availability, fragility, and the need for proper aging and maintenance make it less practical for general-purpose or modern applications. The tube is not a "plug-and-play" component; it demands careful handling, expertise, and additional infrastructure to operate effectively. For most contemporary electronics projects, solid-state alternatives are likely more convenient, cost-effective, and reliable.

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### **Recommendation**

**Buy the H-507 if:**

- You are working on a specific project that requires an electrometer tube or high-impedance amplification (e.g., restoring vintage scientific equipment, building a tube-based preamplifier for audio, or experimenting with electrometer circuits).

- You are a hobbyist or collector with an interest in vintage vacuum tube technology and are willing to invest the time and effort to properly age, test, and integrate the tube into your setup.

- You have access to a reliable power supply, proper shielding, and the expertise to design or modify circuits around the tube s requirements.

- You are prepared to budget for the higher cost and potential maintenance requirements associated with vacuum tubes.

**Avoid buying the H-507 if:**

- You are looking for a general-purpose amplifier tube or a component for modern, high-frequency applications where solid-state alternatives are more practical.

- You lack the knowledge or resources to properly handle, age, and integrate the tube into a circuit.

- Your project does not require the unique characteristics of an electrometer tube, and you are willing to accept the limitations of solid-state components for cost and convenience.

- You are on a tight budget, as the H-507 and associated components (e.g., power supplies, transformers) can add up to a significant expense.

**Alternative Considerations:**

If you are drawn to the

Details:

RARE Early large pin Westinghouse Electrometer Triode RH-507 tube, great shape no damage inside filaments good. No further testing done.

part #: h507 prices

  • $35.00-$35.99

specifications tubesocketvintagego:

  • brand: Westinghouse
  • mpn: H-507
  • type: Vacuum Tube
  • unit type: Unit
  • country of origin: United States

shipping tubesocketvintagego:

  • service: UPS Ground
  • cost: $11.06
  • transit: 4-8 Days
  • carrier: UPS
  • class: Standard
  • type: Calculated

seller tubesocketvintagego:

  • # reviews: 7244
  • rating: 99.7%
  • city: Barre, Vermont

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offer tubesocketvintagego:

  • options: Ship-to-home
  • started: May 14, 2026
  • quantity: 1
  • sold: 0
  • availability: In Stock
  • best offers: True

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  • policy: Returns Accepted
  • time: 14 Days
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  • method: Money back

general tubesocketvintagego:

  • condition: Used
  • Vintage Audio Video > Vintage Parts Accessories > Vintage Tubes Tube Sockets
type: vacuum tube, unit type: unit, country of origin: united states,
category: electronics > vintage audio video > vintage parts accessories > vintage tubes tube sockets, sku: 11286889630572602,
Westinghouse H-507 Is Similar To:
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2 offers $35.00–$35.99 USD
  • Used. Offer #1 priced at $35.00 + $11.06 shipping estimate = $46.06* total. No further testing done.+$11.06 shipping
  • New. Offer #2 priced at $35.99 + $6.88 shipping estimate = $42.87* total. NOS Westinghouse R Electrometer Triode Tube.+$6.88 shipping

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