EF JOHNSON 123-0211 Pin Ceramic Tube Socket Base 872A A4-29

( Brand: Ef Johnson ), ( Manufacturer Part Number: 123-0211 ), ( Type: Ceramic Tube Socket ), ( Similar Brand: Ge ), ( Country Of Origin: United States )

Review EF JOHNSON Type Jumbo Pin Ceramic Tube Socket 211 And 872a Base

The **EF Johnson 123-0211 Pin Ceramic Tube Socket** is a high-performance, precision-engineered component designed for demanding applications in electronics, broadcasting, and industrial systems where reliability and durability are paramount. This socket is specifically engineered to accommodate **872A base A4-29** tubes, a model commonly used in vintage and modern amplifiers, transmitters, and audio equipment, including high-fidelity amplifiers, radio transmitters, and professional audio consoles. Crafted from **high-grade ceramic material**, the socket offers exceptional thermal conductivity and electrical insulation, ensuring stable operation even under prolonged high-power conditions. Its **pin configuration** is meticulously aligned to guarantee a secure and consistent connection with the tube s base, minimizing signal interference and reducing the risk of arcing or contact corrosion. The robust construction of the ceramic body also provides resistance to mechanical stress, thermal shock, and environmental factors, making it ideal for both laboratory and field deployments. Whether integrated into a custom-built amplifier, a restored vintage rig, or a cutting-edge broadcast system, this socket delivers dependable performance with minimal maintenance requirements. Its compatibility with **EF Johnson s extensive line of broadcast and audio equipment** further enhances its versatility, ensuring seamless integration into existing setups while maintaining the integrity of signal transmission. For professionals seeking a premium, long-lasting solution for tube-based electronics, the **123-0211 Pin Ceramic Tube Socket** stands as a testament to precision engineering and uncompromising quality.

### **EF Johnson 123-0211 Pin Ceramic Tube Socket (211/872A Base, A4-29) Pros and Cons**

1. **Compatibility** This socket is specifically designed for **EF Johnson 211/872A base tubes**, ensuring a secure and proper fit without damage to the tube pins. It is also compatible with similar **A4-29 base** tubes, making it versatile for vintage and ham radio equipment.

2. **Durability** Made from **ceramic material**, the socket is resistant to heat and electrical arcing, which is crucial for high-power applications. Ceramic is also less prone to corrosion compared to metal sockets.

3. **Low Contact Resistance** The **gold-plated or silver-plated pins** (depending on the model) provide excellent conductivity, reducing signal loss and ensuring stable performance in transmitters.

4. **Easy Installation** The **pin-style design** allows for straightforward insertion into the chassis, and the socket is typically pre-wired for direct soldering or terminal connection.

5. **Long Lifespan** Ceramic sockets are less likely to degrade over time compared to plastic or poorly insulated metal alternatives, making them a reliable long-term component.

6. **Compatibility with Vintage Gear** If you own older **EF Johnson, Hallicrafters, or similar amateur radio equipment**, this socket is a direct replacement part, reducing the need for custom modifications.

7. **Heat Dissipation** Ceramic material helps dissipate heat away from the tube pins, preventing overheating in high-power applications.

---

1. **Limited Use Beyond EF Johnson Tubes** While it fits **211/872A and A4-29 base tubes**, it may not be compatible with other tube base types (e.g., 9-pin, 13-pin, or octal bases). Ensure your tube matches before purchasing.

2. **Potential for Loose Connections** If not properly soldered or secured, the socket pins may become loose over time, leading to intermittent contacts or signal issues. Some users report that **additional strain relief** (e.g., soldering wires directly to the socket) is necessary for reliability.

3. **Cost Compared to Alternatives** Ceramic sockets are generally more expensive than **plastic or metal alternatives**, especially for high-power applications where quality is critical.

4. **Soldering Required** Unlike plug-and-play connectors, this socket typically requires **soldering to the chassis**, which may not be ideal for beginners or those without basic electronics skills.

5. **Availability of Replacements** If the socket fails, finding an exact replacement may be difficult, especially for older or discontinued models. Some users suggest keeping a spare on hand.

6. **Potential for Overheating in Poor Ventilation** While ceramic helps with heat dissipation, if the socket is installed in a **poorly ventilated area** or near other heat sources, it may still overheat under sustained high-power use.

7. **Compatibility with Modern Equipment** Since this is a **vintage component**, it may not work with newer, standardized tube sockets unless retrofitted.

---

### **Conclusion**

The **EF Johnson 123-0211 Pin Ceramic Tube Socket** is a **high-quality, durable, and reliable** component for **EF Johnson 211/872A and A4-29 base tubes**, particularly in **vintage amateur radio transmitters**. Its **ceramic construction, low contact resistance, and heat resistance** make it ideal for **high-power applications** where stability is critical.

However, its **limited compatibility, requirement for soldering, and higher cost** compared to simpler alternatives may be drawbacks for some users. If you are working with **EF Johnson or similar vintage gear**, this socket is a **strong recommendation** for maintaining performance and longevity. For modern or non-matching tube bases, alternative sockets may be more practical.

---

### **Recommendation**

- You own **EF Johnson 211/872A or A4-29 base tubes** and need a **reliable, high-power socket**.

- You are restoring or repairing **vintage amateur radio equipment** where durability is essential.

- You have **basic soldering skills** and can ensure proper installation.

- You need a **universal socket** that fits multiple tube bases.

- You are a **beginner** without soldering experience.

- You are working with **modern equipment** that uses different tube standards.

**Final Verdict:** This socket is a **solid, long-lasting choice** for its intended applications, but verify compatibility and installation requirements before purchasing. If possible, **test it in a low-power setup first** to ensure proper function.

Details:

EF Johnson Jumbo 4 Pin Bayonet sockets, Similar to GE 123-211 Ceramic Socket, fits 211 872A tubes. No combined shipping discount is available on FREE Shipping items. NOTE: Buyer pays return shipping. This listing is for one Socket, These fit EIA base A4-29 bayonet tubes tube diameter 1-7/8.

part #: 1230211 price

• $17.95

specifications tubesocketvintagego:

• brand: Ef Johnson
• mpn: 123-0211
• type: Ceramic Tube Socket
• similar brand: Ge
• country of origin: United States

payments tubesocketvintagego:

• other
• wallet: Paypal
• credit card: Mastercard

shipping tubesocketvintagego:

• transit: 4-10 Days
• type: Calculated
• cost: $11.15
• carrier: USPS
• class: Standard, Expedited
• service: USPS Ground Advantage, USPS Priority Mail

seller tubesocketvintagego:

• city: Anamosa, Iowa
• # reviews: 6097
• rating: 100.0%

offer tubesocketvintagego:

• options: Ship-to-home
• quantity: 1
• sold: 0
• started: February 7, 2026
• availability: In Stock

returns tubesocketvintagego:

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

general tubesocketvintagego:

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

Ef Johnson 123-0211 Is Similar To:

• 122-244-1 Ef Johnson Tube Socket (38.6% similar) Catalog new old stock, excellent condition. Ef Johnson tube socket type 244...(November 17th, 2017)
• 122-244-200 Ef Johnson Ceramic Vacuum (33.6% similar) I combine you pay. Please see to photos for condition and quality. Been sitting on a shelf no box. Up for your consideration Ef Johnson ceramic vacuum tube socket 244 4-PIN - as shown in the photo's...(November 25th, 2017)
• 123-209-1 Ef Johnsoon Johnson Tube Socket In Original Box Catalog Number (44.2% similar) Here is an Ef Johnson tube socket in the original box. It is being sold as-is, not working, or for parts. Catalog number vintage electronics...(September 2nd, 2018)
• 124-0115-002 Ef Johnson 2 New (25.2% similar) These are 2 new Johnson tube sockets for 4CX250B never been soldered on...(December 13th, 2017)
• 124-110-1 Ef Johnson Vintage Nos 7-pin (33.3% similar) Vintage Ef Johnson 7-PIN tube socket new old stock in box with original silver saver paper packing. Socket has some tarnish but new and excellent. The box has some shelf storage wear...(February 25th, 2017)
• Ef Johnson 4cx250 124-115 Socket Eimac Tube (43.2% similar) Up for offer is a Johnson tube socket for the 4CX250 series transmitting power tubes. Shipping is a flat this unit is part number some pin connections are already soldered to the case, but can easily be un soldered. This is a 7 pin socket with a large pin...(January 29th, 2015)
• 237 Ef Johnson Ceramic Vacuum Tube Socket For And Others (53.6% similar) 4EA Ef Johnson 237 UX-7 ceramic vacuum tube socket for and others. Used, refurbished. Shipping weight 1 pound...(November 1st, 2018)
• Cna 49327 Ef Johnson Pin Ux Audio Radio Porcelain Nos Vacuum (33.8% similar) One 4 pin ix audio radio porcelain nos vacuum tube socket made in the USA P/N Can minor surface tarnish or blames clean connections mounting holes: please review the photos for more detail. Our standard service is us postal 1ST class. We combine shipping when applicable. Please with any questions. 8...(July 23rd, 2018)
• Ef-80 Telefunken Diamond Base Eye Tube Tested Good (31.8% similar) You are buying on telephoning EM-80 diamond base eye tube tested good tubes have been a b k 707 DNA-jet tester all to be based the manual guidelines...(August 20th, 2018)
• Ef-84 Telefunken Diamond Base Eye Tube Tested Good (28.8% similar) You are buying on telephoning EM-84 diamond base eye tube tested good tubes have been a b k 707 DNA-jet tester all to be based the manual guidelines...(August 20th, 2018)
• Ef 85 6by7 Amperex Nos Nib Audio Receiver Guitar Vacuum Tube (29.6% similar) Our standard shipping is us postal 1ST class. Please review the photos for more detail. We combine shipping when applicable. Ef 85 6BY7 Ampere nos nib audio receiver guitar vacuum tube early 1960 S. Round silver mesh plate, two spacers, halo wire fetter frames, top flashes and clean pins...(June 29th, 2018)