COLLINS COO455 Rockwell Tube Guard Receiver Military Radio CW2167 AN/ARC-27 504 9780 005 MOD-3

( Brand: Collins ), ( Manufacturer Part Number: COO455 ), ( Model: CW2167 ), ( Type: Tube Amplifier ), ( Supported Modes: Cw ), ( Unit Type: Unit ), ( Features: Analog ), ( Country Of Origin: United States )

Review COLLINS Rockwell An/arc-27 Tube Guard Receiver 504 005 Military Radio

The **Collins COO-455 Rockwell AN/ARC-27 Tube Guard Receiver (504-9780-005 Mod-3)** is a meticulously engineered, high-performance military radio component designed to enhance the reliability and longevity of the iconic AN/ARC-27 series of radios, which have served as the backbone of U.S. military communications for decades. This specialized **Tube Guard Receiver** is a critical accessory for maintaining the operational integrity of the AN/ARC-27 s vacuum tube circuitry, particularly in the **Mod-3 variant**, which was widely deployed during the Cold War and remains in use in legacy systems today. Crafted with precision by Collins Radio (later acquired by Rockwell International), this unit is engineered to protect the radio s delicate tubes from voltage spikes, electrical surges, and environmental stressors that could otherwise lead to premature failure or catastrophic damage. The **504-9780-005** designation indicates a specific configuration tailored for the Mod-3 model, ensuring compatibility with its unique electrical and mechanical specifications. Built to withstand the harsh conditions of military operations whether in the heat of combat, extreme altitudes, or rugged field environments the Tube Guard Receiver incorporates robust shielding and filtering mechanisms to safeguard the radio s power supply and signal processing components. Its inclusion in the AN/ARC-27 system significantly reduces the risk of tube burnout, extends the lifespan of critical hardware, and minimizes downtime during critical missions. Whether integrated into a fixed ground station, a mobile command vehicle, or an aircraft, this component exemplifies the engineering rigor demanded by military-grade electronics, offering uncompromising durability and performance. For collectors, restorers, or operators working with vintage military radios, the **AN/ARC-27 Tube Guard Receiver (Mod-3)** is an indispensable part of preserving the functionality of one of the most enduring and influential communication systems in military history.

### **Pros and Cons of buying a Collins COO-455 (Rockwell AN/ARC-27 Tube Guard Receiver 504 9780 005 Mod-3 Military Radio)**

1. **Historical and Military Significance** The Collins COO-455 (AN/ARC-27) is a well-known military radio from the mid-20th century, used extensively in aviation and ground communications. Owning one provides a tangible piece of aviation and military history.

2. **Reliability and Durability** As a vacuum tube-based radio, it was built to withstand harsh conditions, making it a robust piece of equipment. Many surviving units have lasted decades with proper maintenance.

3. **Collectible Value** Due to its rarity and historical importance, the AN/ARC-27 holds value among radio and military enthusiasts. Some well-preserved examples can appreciate over time.

4. **Functionality for Ham Radio Operators** The COO-455 can be modified for amateur radio use, allowing operators to experiment with vintage equipment and enjoy the challenge of restoring and operating a classic radio.

5. **Technical Challenge and Learning Opportunity** Working with vacuum tube radios requires knowledge of electronics, troubleshooting, and restoration techniques, making it a rewarding project for hobbyists.

6. **Aesthetic Appeal** The radio has a distinctive military design with a sturdy metal chassis, knobs, and dials, making it an attractive piece for display in a ham shack or museum setting.

7. **Compatibility with Vintage Systems** If you are part of a group or club that operates vintage military radios, this unit may integrate well with other period equipment for historical reenactments or communication exercises.

---

1. **High Cost of Acquisition** Authentic, fully functional, and well-preserved AN/ARC-27 radios can be expensive, often costing several hundred to over a thousand dollars depending on condition and rarity.

2. **Maintenance and Repair Challenges** Vacuum tube radios require specialized knowledge to repair. Tubes degrade over time, and sourcing replacements can be difficult and costly. Power supply issues, capacitor failures, and alignment problems are common.

3. **Power Requirements** The radio typically requires a stable, high-voltage power supply (often 28V DC or 115V AC), which may not be readily available in modern setups unless you invest in a suitable power source.

4. **Limited Modern Functionality** Unlike modern radios, the AN/ARC-27 lacks digital features, limited frequency coverage, and may not be compatible with modern communication protocols or accessories.

5. **Space and Weight** The radio is bulky and heavy, requiring dedicated space in a shack or display area. This can be impractical for those with limited room.

6. **Legal Restrictions** Some military radios are subject to export controls or require special permissions to operate on amateur bands. Ensure compliance with local laws and FCC regulations before use.

7. **Time-Consuming Restoration** If purchased in poor condition, restoring the radio to full functionality can be a lengthy and labor-intensive process, requiring soldering, alignment, and testing skills.

8. **Limited Availability of Parts** Finding original or compatible parts (e.g., tubes, transformers, switches) can be difficult, increasing repair costs and downtime.

---

The Collins COO-455 (AN/ARC-27) is a fascinating and historically significant radio that appeals to collectors, hobbyists, and enthusiasts of vintage technology. It offers a unique blend of reliability, collectibility, and technical challenge. However, its high cost, maintenance demands, and limited modern utility make it a specialized purchase rather than a practical everyday radio.

If you are passionate about restoring vintage electronics, enjoy the history of military aviation, or seek a challenging project, this radio could be a rewarding addition to your collection. On the other hand, if you prioritize modern convenience, ease of use, or cost-effectiveness, a contemporary radio may be a more practical choice.

---

- You are an experienced ham radio operator or electronics enthusiast willing to invest time in restoration and maintenance.

- You appreciate historical military radios and are interested in preserving or modifying vintage equipment.

- You have access to resources (tools, knowledge, parts) to keep the radio operational.

- You are prepared to budget for potential repair costs and power supply upgrades.

- You are looking for a plug-and-play radio for modern communication needs.

- You lack the technical skills or patience to troubleshoot and repair vacuum tube radios.

- You cannot justify the cost given the limited practical use compared to modern alternatives.

- You are unsure about legal restrictions on operating military radios on amateur bands.

For those who decide to pursue this project, pairing it with a modern power supply, test equipment, and a community of like-minded hobbyists will greatly enhance the experience.

Details:

Not complete. See photos for details. Feel free to send me any questions or for more pictures. History unknown.

part #: coo455 prices

• $45.00-$272.00

specifications hamamateuradio:

• brand: Collins
• mpn: Coo455
• model: Cw2167
• type: Tube Amplifier
• supported modes: Cw
• unit type: Unit
• features: Analog
• country of origin: United States

returns hamamateuradio:

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

general hamamateuradio:

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

shipping hamamateuradio:

• class: Standard
• service: USPS Ground Advantage, UPS Ground
• type: Fixed
• carrier: USPS, UPS
• cost: $9.99
• transit: 5-10 Days

offer hamamateuradio:

• quantity: 1
• sold: 0
• availability: In Stock
• best offers: True
• options: Ship-to-home
• started: February 21, 2026

payments hamamateuradio:

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

seller hamamateuradio:

• rating: 100.0%
• city: Edmond, Oklahoma
• # reviews: 883

Collins COO455 Is Similar To:

• 0982613814 Collins Rockwell Years Of Innovation (37.3% similar) New in shrink wrap. Collectable now that UTC purchased them. History of Collins radio. Hard bound slide cover...(November 12th, 2018)
• 0k-145 C-8364 Tsc-60 Collins Radio Rockwell Military Aircraft Hf Control (37.7% similar) Testing cosmetic notes: this is a unknown condition item in fair that not tested and sold as-is guaranteed unit shows several wear, scratches, cracks, dent on the exterior. 00LBS start: 99. This is not a reflection of the condition item. At template rounded right bottom. Template rounded left bottom...(October 29th, 2018)
• 127l 8581 Collins Radio New (22.8% similar) New: Collins radio gauge dial facepalms db units model 127L part no pieces included. Both have same colors, flash from camera skewed one...(October 4th, 2017)
• 17l-7 Collins Radio Company Vhf (22% similar) The set operates off 27. This offer is for a Collins radio company, type 17L-7, vhf transmitter. To take a good look at the pictures as they give much better than words can. 9 macs in 680 channels. 5 volts dc and covers the frequency range of this is designed for aircraft vhf communications. The ...(March 31st, 2017)
• 180l-3 Collins Radio Antenna Tuner (21.5% similar) Please look at all photos and ask questions before buying. Collins radio antenna tuner 180L-3 nice vintage piece of equipment from Kelly air force base San Antonio...(March 25th, 2018)
• 19 Collins Radio Ten Channel Broadcast Transmitter Site Monitor Mint (16.8% similar) This is a rare piece of broadcast history and if you collect Collins radio equipment, should interest. Condition: issued but not used. Other than this, you can consider it issued but not used. It has not been used but moved from one owner to another and handled by hand. Item for sale: one ea unused ...(June 23rd, 2018)
• 20m-cr-12-75 074-3624-000 20m-cr-12-75 Collins Radio Amateur (17.7% similar) Collins radio amateur equipment catalog 14 pages 20M-CR-12-75...(July 5th, 2017)
• 210-1018-029 Collins Radio Mechanical Filter (19.8% similar) The pass band is. This is in very good condition, it looks un-used. This is a Bolivar mechanical filter made for Collins radio. 5 JCS the Collins part number is this a vintage filter date code Bolivar LP-864...(July 12th, 2017)
• 241-0455-000 Collins Rockwell 500 Khz (33.9% similar) Band pass filter new old stock - military spare rockwell Collins part oem 46D56C to 520 khz 500 z input 1500 ohms output hermetically sealed Nan...(May 23rd, 2017)
• 242f-5cl Collins Radio Rack System 51m-8 (20.5% similar) The shipping calculator seems to be running high lately. Thank-you for looking happy ING. Collins radio rack system 51M-8 receiver 242F-5CL transmitter PS manuals. The pictures are part of. Zip code please send your for an accurate shipping cost...(February 18th, 2017)
• 310b3 Collins Amateur Radio Transmitter-exciter (26.9% similar) The Collins 310B3 has been is storage for many years. Shipping is via USPS,zip code 01073. Collins 310B3 transmitter exciter in fair to good condition un-tested. Shipping is calculated from my zip code to your. Zip code here is the power output 15 watts ,serial number ,15,20,40 and 80 meter coils ...(January 31st, 2018)