LEEDS NORTHRUP 063918 Processor Circuit Board

( Brand: Leeds Northrup ), ( Manufacturer Part Number: 063918 ), ( Part Type: Circuit Board )

Review LEEDS NORTHRUP And Processor Circuit Board

The **Leeds & Northrup Model 063918 Processor Circuit Board** is a meticulously engineered analog computing and control component designed for precision industrial automation, scientific research, and process control applications during its era of production in the mid-20th century. This high-performance board represents a pinnacle of 1950s-era analog computing technology, featuring a robust hybrid design that integrates vacuum tube amplification, vacuum tube diodes, and early transistor elements reflecting the transitional phase between purely tube-based systems and the emerging solid-state revolution. At its core, the 063918 serves as a versatile computational module capable of performing complex arithmetic operations, including addition, subtraction, multiplication, and division, through a series of interconnected operational amplifiers and scaling networks. The board s architecture is built around a modular philosophy, allowing seamless integration into larger Leeds & Northrup analog computers, such as the **Model 864** or **Model 865**, where it functions as a critical processing unit for real-time data acquisition, control loop calculations, and dynamic system modeling.

The physical construction of the 063918 is equally impressive, with a sturdy **chassis-mounted layout** featuring meticulously wired vacuum tube sockets, precision resistors, and high-grade capacitors arranged in a grid-like pattern for optimal signal routing. The board s front panel is equipped with a series of **rotary switches, potentiometers, and indicator lamps**, enabling operators to configure input/output scaling, select computational modes, and monitor operational status with real-time feedback. The rear panel is designed for robust connectivity, offering multiple **BNC or binding post terminals** for interfacing with sensors, transducers, and other analog computing modules, ensuring compatibility with a wide range of industrial and laboratory setups. The inclusion of **vacuum tube rectifiers** and **beam power tubes** underscores the board s capacity to handle high-power applications, while its **dual-channel design** allows for parallel processing of independent signals, enhancing its utility in multi-variable control systems.

Beyond its computational prowess, the 063918 is renowned for its **exceptional stability and accuracy**, attributes that were critical in applications such as **process control for chemical plants, aircraft flight simulators, and nuclear research facilities**. The board s **negative feedback loops** and **temperature-compensated components** minimize drift and error accumulation, ensuring reliable performance even under demanding conditions. Additionally, its **plug-and-play compatibility** with other Leeds & Northrup peripherals, such as the **Model 864 Analog Computer System**, makes it an invaluable component for building scalable, high-fidelity simulation and control architectures. For collectors, historians of computing technology, and enthusiasts of analog engineering, the 063918 represents a fascinating artifact of an era when analog computation reigned supreme, offering a tangible connection to the foundational principles of modern control systems and computational theory.

### **Pros and Cons of Buying a Leeds Northrup 063918 Processor Circuit Board**

1. **Reliability and Durability** Leeds Northrup was a well-regarded manufacturer of industrial instrumentation, and their components were designed for long-term use in harsh environments. The 063918 board was likely built to withstand temperature fluctuations, electrical noise, and mechanical stress, making it a robust choice for industrial applications.

2. **Compatibility with Legacy Systems** If you are maintaining or upgrading an older Leeds Northrup or similar industrial control system, this board may be a direct replacement part, ensuring seamless integration without requiring major system modifications.

3. **Proven Performance** Since these boards were used in critical applications such as process control, power generation, or manufacturing, they were likely tested for stability and accuracy. If the board is in good condition, it may perform reliably in its intended role.

4. **Potential Cost Savings** If the board is functional and available at a reasonable price (especially if sourced from a used or refurbished supplier), it could be a cost-effective alternative to purchasing a new equivalent from a modern manufacturer.

5. **Availability of Technical Support** Some suppliers or original equipment manufacturers (OEMs) may still offer documentation, schematics, or limited technical support for Leeds Northrup components, which can be helpful for troubleshooting or maintenance.

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1. **Age and Obsolescence** Leeds Northrup was acquired and eventually phased out by Honeywell and other companies, meaning production of this specific board has long since stopped. Finding a new, unused unit may be difficult, and you may need to rely on used or refurbished stock, which could introduce risks.

2. **Limited Availability and Lead Times** Even if the board exists, sourcing it may require searching through specialty industrial surplus markets, eBay, or specialized distributors. Lead times could be unpredictable, and availability may be sporadic.

3. **Potential for Wear or Failure** If the board is used, it may have accumulated wear, such as degraded solder joints, failing capacitors, or corrosion. Without a thorough inspection or testing, you risk purchasing a faulty unit that could fail prematurely.

4. **Compatibility Issues** While the board may fit mechanically, electrical or software compatibility with modern systems could be a concern. For example, if the system relies on outdated communication protocols or power requirements, the board may not integrate smoothly.

5. **Lack of Warranty or Support** Unlike new commercial-grade components, a used or refurbished Leeds Northrup board typically comes with no warranty. If it fails shortly after purchase, you may be left without recourse for repairs or replacements.

6. **Higher Long-Term Costs** If the board requires frequent repairs or replacements due to age-related failures, the cumulative cost of maintaining it could outweigh the initial savings of purchasing it used.

7. **Ethical and Environmental Concerns** Purchasing used electronics may contribute to electronic waste if the board is not properly recycled or repurposed. Additionally, some suppliers may not provide clear information about the board s history or condition.

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### **Conclusion**

The Leeds Northrup 063918 processor circuit board can be a viable purchase if you are maintaining a legacy system where no modern alternative exists, and you can source a reliable, tested unit. However, the risks of obsolescence, potential unreliability, and lack of support make it a high-risk investment unless you are certain of the board s condition and compatibility with your system.

- **Verifying the board s functionality** through testing or inspection before purchase.

- **Ensuring compatibility** with your system s power supply, communication protocols, and environmental conditions.

- **Considering a backup plan** in case the board fails, such as having a spare or exploring alternative solutions.

If possible, explore modern alternatives from manufacturers like Honeywell, Siemens, or Allen-Bradley, which may offer drop-in replacements or compatible upgrades. Only purchase the Leeds Northrup board if you are confident in its reliability and have no other options.

### **Recommendation**

- **If the board is essential and no alternatives exist**, purchase from a reputable supplier with a return policy or inspection process to ensure quality. Budget for potential repair costs.

- **If the board is non-critical**, prioritize finding a modern replacement to avoid long-term maintenance headaches.

- **If sourcing is difficult**, consider consulting with an industrial automation specialist who may have experience with Leeds Northrup systems and can guide you on compatibility or alternatives.

Details:

But when available in multiple quantity, the photo shown is representative of item. No stocking fees, no hassles. Please see above for details on item condition. Combined shipping on multiple items.

Special invoicing and/or packaging requests. Whats Included.

part #: 063918 prices

• $150.00-$305.33

specifications pcbemdev:

• brand: Leeds Northrup
• mpn: 063918
• part type: Circuit Board

general pcbemdev:

• Electronic Components Semiconductors > Circuit Boards Prototyping > Printed Circuit Boards PCBs
• condition: Used

offer pcbemdev:

• options: Ship-to-home
• sold: 0
• best offers: True
• availability: In Stock
• started: February 3, 2026
• quantity: 1

payments pcbemdev:

• wallet: Paypal
• credit card: Diners-club
• other

returns pcbemdev:

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

seller pcbemdev:

• city: Galion, Ohio
• rating: 99.9%
• # reviews: 9365

shipping pcbemdev:

• type: Calculated
• service: USPS First Class
• transit: 3-8 Days
• class: Standard
• carrier: USPS
• cost: $10.50

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