EF JOHNSON 122-247-200 Pin Transmitting Tube Socket E.f. Porcelain

( Brand: Ef Johnson ), ( Manufacturer Part Number: 122-247-200 ), ( Type: Transmitting Tube Socket ), ( Country Of Origin: United States )

Review EF JOHNSON E.f. 247 Seven Pin Transmitting Tube Socket Porcelain

The **EF Johnson 122-247-200 E.F. 247 Pin Transmitting Tube Socket** is a meticulously engineered, high-performance porcelain socket designed exclusively for the demanding applications of vintage and modern amateur radio transmitters, particularly those utilizing the EF Johnson 247 series of transmitting tubes. Crafted from high-grade, electrically insulating porcelain, this socket is built to withstand the extreme thermal and electrical stresses encountered in high-power RF environments, ensuring reliable operation and longevity even under continuous duty cycles. The **247-pin configuration** reflects the precise pinout required for the EF Johnson 247 tube, a robust power amplifier tube renowned for its efficiency and durability in linear amplifier setups, making this socket an essential component for maintaining signal integrity and preventing arcing or contact corrosion. The porcelain body not only provides superior thermal dissipation but also resists the corrosive effects of ozone and moisture, which are common in high-voltage RF circuits. Each pin is meticulously plated with a durable, corrosion-resistant finish to ensure low contact resistance and consistent electrical performance, while the robust mechanical design allows for secure mounting and easy installation within transmitter chassis. Whether used in classic EF Johnson transmitters like the **2000, 3000, or 4000 series** or in modern rebuilds and restoration projects, this socket serves as a critical interface between the tube and the circuit board, guaranteeing stable operation and minimizing the risk of catastrophic failure. Its precision engineering and compatibility with the EF 247 tube make it an indispensable part of any high-power RF system where reliability and performance are paramount.

### **Pros and Cons of buying a EF Johnson 122-247-200 (EF 247 Pin Transmitting Tube Socket, Porcelain)**

1. **Compatibility with Vintage Equipment** This socket is designed specifically for EF Johnson transmitters, particularly older models like the EF-247, which were widely used in amateur radio and military communications from the mid-20th century. If you re restoring or repairing such equipment, this socket ensures proper functionality.

2. **Durability and Longevity** Porcelain sockets are known for their resistance to heat, electrical arcing, and mechanical stress, making them suitable for high-power transmitting applications. Over time, they can withstand repeated use without degrading as quickly as plastic alternatives.

3. **Standardized Pin Configuration** The EF 247 pin layout is well-documented, meaning you can easily find wiring diagrams, schematics, and replacement parts. This reduces guesswork when repairing or modifying the socket.

4. **Availability of Replacement Parts** Since EF Johnson equipment was widely used, replacement sockets and associated components (like tubes, wiring harnesses, and connectors) are still available through vintage electronics suppliers, eBay, or specialized radio restoration forums.

5. **Historical and Collectible Value** If you re restoring a classic radio or military communications system, this socket may be a sought-after part for enthusiasts. Some collectors value fully functional vintage components.

6. **Lower Cost Compared to Newer Alternatives** Since these sockets are no longer mass-produced, they are often cheaper than modern high-power RF connectors, especially if sourced from used or surplus inventory.

7. **Compatibility with Aftermarket Tubes** Many EF Johnson sockets can accommodate modern replacements for original tubes (e.g., 811A, 4C25, or 4-250), extending the life of your equipment without requiring a full rebuild.

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1. **Limited Modern Availability** Unlike common connectors (e.g., N-type, BNC), EF Johnson sockets are niche and may not be stocked by mainstream electronics suppliers. You ll likely need to search through vintage parts dealers, eBay, or specialized forums.

2. **Potential for Wear and Tear** If the socket is old, the porcelain may be cracked, the pins corroded, or the insulation degraded. Testing and cleaning may be required before use.

3. **Specialized Knowledge Required** Working with high-power transmitting tubes and sockets demands understanding of RF safety, proper grounding, and tube handling. Incorrect installation can lead to arcing, tube damage, or even fires.

4. **Compatibility Issues with Modern Equipment** If you re integrating this socket into a modern setup, you may need additional adapters or isolation components to ensure proper impedance matching and signal integrity.

5. **Risk of Counterfeit or Poor-Quality Replacements** Some sellers on eBay or Alibaba may offer fake or poorly made replicas. Always verify the authenticity of the part, especially if purchasing from an unknown source.

6. **Maintenance Requirements** Porcelain sockets can accumulate dirt, oxidation, or carbon deposits over time, requiring periodic cleaning with isopropyl alcohol and a soft brush. Neglecting maintenance can lead to poor connections.

7. **No Warranty or Support** Since these are vintage parts, sellers rarely offer warranties or technical support. If the socket fails shortly after purchase, you may be out of luck without recourse.

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### **Conclusion**

The **EF Johnson 122-247-200 (EF 247 pin socket)** is a valuable component for restoring or repairing vintage EF Johnson transmitters, particularly for amateur radio operators, military communications enthusiasts, or collectors. Its durability, compatibility with classic equipment, and availability of replacement parts make it a practical choice for those working with mid-20th-century radio gear.

However, the **limited modern availability, potential for wear, and need for specialized knowledge** mean that this socket is best suited for experienced hobbyists or professionals. If you re not confident in handling high-power RF components, it may be safer to consult a specialist or consider modern alternatives (e.g., high-power RF connectors with similar pinouts) if compatibility allows.

For most users, **this socket is worth purchasing if you have a specific vintage EF Johnson unit to repair and can source it reliably**. If you re unsure about installation or safety, investing in professional restoration services may be the safer option.

- You are restoring an EF Johnson EF-247 or similar transmitter.

- You have experience with high-power RF equipment and tube handling.

- You can verify the socket s condition (no cracks, clean pins) before purchase.

- You re willing to source it from a reputable vintage electronics supplier.

- You re not comfortable with RF safety or tube socket repairs.

- You cannot confirm the socket s authenticity or condition.

- You re working with modern equipment that doesn t require this specific socket.

- You prefer plug-and-play solutions over restoration projects.

For best results, **test the socket for continuity and resistance before installation**, and consider consulting a vintage radio restoration guide or forum for wiring assistance.

Details:

It is in very good condition. Tube Socket, for seven pin transmitting tubes like the 4-65 and other large power. Please see photos. Made by EF Johnson Part Number 122-247-2 The condition of this amplifier part is as follows.

All lugs have had the solder removed so they are ready to connect new wires. Johnson 247 Seven Pin Transmitting Tube Socket 122-247-200 7 Porcelain.

part #: 122247200 price

• $13.75

specifications hamamateuradio:

• brand: Ef Johnson
• mpn: 122-247-200
• type: Transmitting Tube Socket
• country of origin: United States

returns hamamateuradio:

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

payments hamamateuradio:

• wallet: Apple-pay
• credit card: Visa
• other
• money order

offer hamamateuradio:

• availability: In Stock
• sold: 0
• started: June 10, 2026
• options: Ship-to-home
• quantity: 1

general hamamateuradio:

• Radio Communication > Ham, Amateur Radio > Ham Radio Amplifiers
• condition: For parts or not working

shipping hamamateuradio:

• service: Standard
• transit: 3-7 Days
• type: Fixed
• class: Standard
• cost: $5.00

seller hamamateuradio:

• # reviews: 9050
• rating: 100.0%
• city: Pikeville, North Carolina

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