RAYTHEON CK5751WA Triple Mica Blackplate Square Getter Noise 12AX7 ECC83 Tube Nos

( Brand: Raytheon ), ( Manufacturer Part Number: CK5751WA ), ( Type: Vacuum Preamp Tube ), ( Country Of Origin: United States )

Review RAYTHEON Triple Mica Blackplate Square Getter Low noise Tube Tested Nos

The **Raytheon CK5751WA (ECC83, 12AX7 equivalent) Triple Mica Blackplate Low-Noise Tube** is a meticulously crafted, high-performance vacuum tube designed for audiophiles, vintage amplifier restorers, and discerning electronics enthusiasts seeking unparalleled tonal clarity and reliability. This tube belongs to the legendary **12AX7 family**, renowned for its versatility in preamplifier and phase splitter applications, but the CK5751WA stands out with its **triple mica blackplate construction**, a hallmark of superior thermal stability and longevity. The **blackplate** a thick, heat-resistant ceramic base ensures consistent performance across a wide temperature range, eliminating the common issues of thermal drift found in conventional glass-envelope tubes. This design choice not only enhances the tube s durability but also contributes to a **cleaner, more linear amplification**, reducing unwanted harmonic distortion and preserving the integrity of delicate audio signals.

Inside the tube, a **triode configuration** with three independently controlled grids (pin 1, 2, and 4) delivers the classic **12AX7 gain and drive characteristics**, making it an ideal choice for preamplifier stages in vacuum tube amplifiers, guitar pedals, and high-end audio processing gear. The **low-noise specification** of this tube is particularly noteworthy, as it minimizes internal electron noise, resulting in a **quieter, more transparent signal path** a critical factor for audiophiles seeking a pristine listening experience. The **ECC83 designation** (its European equivalent) further underscores its compatibility with a vast array of vintage and modern amplifier schematics, ensuring seamless integration into both classic and contemporary designs.

The **mica insulation** between the tube s internal components including the cathode and control grids adds another layer of refinement, reducing microphonic noise and improving thermal efficiency. This construction method is less prone to degradation over time compared to traditional glass-envelope tubes, which can suffer from cathode sag or grid shifts under prolonged use. The **blackplate s robust build** also makes the CK5751WA more resistant to physical stress, such as vibrations or temperature fluctuations, which can otherwise compromise performance in demanding environments.

For collectors and restorers of vintage electronics, this tube is a **highly sought-after replacement** for original 12AX7 tubes in amplifiers like the **Fender Twin Reverb, Gibson GA-2, or Marshall JMP-1**, where its stability and tonal balance are often preferred over modern alternatives. Its **low-noise characteristics** also make it a favored component in **audio measurement equipment, oscilloscopes, and precision amplifiers**, where signal fidelity is paramount. Whether used in a **high-end stereo system, a classic guitar amplifier, or a custom-built audio project**, the CK5751WA delivers a **warm, detailed, and responsive sound** with minimal unwanted artifacts, embodying the best of both vintage craftsmanship and modern engineering.

In summary, the **Raytheon CK5751WA (ECC83) Triple Mica Blackplate Low-Noise Tube** is not merely a replacement part but a **premium audio component** that elevates performance in any application it serves. Its **thermal stability, low noise floor, and vintage-inspired reliability** make it a standout choice for those who demand the highest standards in sound quality and longevity. Whether you're restoring a beloved amplifier or building a new system, this tube offers a **timeless blend of power, clarity, and character** that only the finest vacuum tubes can provide.

### **Pros and Cons of buying a Raytheon CK5751WA (12AX7/ECC83) Triple Mica Blackplate Square Getter Low-Noise Tube (NOS)**

1. **Authentic and High-Quality NOS (New Old Stock) Tube**

- This is a genuine Raytheon 12AX7/ECC83 tube from the original manufacturing run, meaning it has not been remanufactured or altered. NOS tubes are often sought after for their superior sound and reliability compared to modern or reissued versions.

2. **Triple Mica Construction**

- The triple mica capacitor design in the 12AX7 is known for producing a warmer, more natural tone with less high-end harshness compared to single-mica or ceramic-capacitor tubes. This makes it ideal for guitar amps, preamps, and high-end audio applications where clarity and smoothness are desired.

3. **Blackplate Construction**

- The blackplate version of the 12AX7 is a later variant (post-1950s) that features a blackened cathode plate, which helps reduce microphonic noise and improves stability. This makes it a more refined choice for critical listening or professional setups.

4. **Square Getter**

- The square getter indicates that this tube was likely manufactured in the 1950s or later, as earlier versions used a circular getter. Square getters are associated with improved vacuum integrity and longevity.

5. **Low-Noise Characteristics**

- The "low-noise" designation suggests that this tube has been selected or manufactured to minimize internal noise, making it suitable for clean guitar tones, hi-fi preamps, and sensitive audio applications.

6. **Historical and Collectible Value**

- As an NOS tube, it holds historical significance and may appreciate in value over time, especially if it remains in excellent condition. Collectors and audiophiles often prefer NOS tubes for their unique characteristics.

7. **Superior Sound for Guitar Amps**

- The 12AX7 is a staple in guitar amplifiers (e.g., Fender, Marshall, Vox) due to its warm, smooth gain and midrange emphasis. The triple mica version is particularly favored for its balanced tone, making it ideal for clean and slightly overdriven tones.

8. **Long Lifespan with Proper Care**

- When used correctly (not overdriven, proper bias, and cooling), NOS 12AX7s can last decades, sometimes even exceeding 20,000 hours of use.

9. **Compatibility with Modern and Vintage Gear**

- The 12AX7 is a universal tube used in countless amplifiers, pedals, and preamps, making this tube highly versatile for both vintage and modern setups.

10. **Aesthetic Appeal**

- The blackplate finish and NOS condition give the tube a classic, museum-quality appearance, which appeals to enthusiasts who appreciate the look of original components.

---

1. **High Cost**

- NOS tubes, especially well-preserved ones like this Raytheon 12AX7, command premium prices. Depending on condition and rarity, this tube could cost **$100 $300 or more**, making it significantly more expensive than modern or reissued versions.

2. **Potential for Variability**

- Even within the same batch, NOS tubes can exhibit slight variations in sound and performance due to aging and manufacturing inconsistencies. This may require experimentation to find the "sweet spot" for your specific application.

3. **Sensitivity to Handling**

- Tubes are fragile, and improper handling (e.g., touching the glass, exposing to moisture, or mishandling the filament) can damage them. NOS tubes, being older, are even more susceptible to handling damage.

4. **Limited Availability**

- True NOS 12AX7s are becoming rarer as stocks dwindle. If you rely on this tube for your setup, you may face difficulties finding replacements in the future, especially if you prefer NOS over modern tubes.

5. **Potential for Microphonics or Noise**

- While marketed as "low-noise," some NOS tubes especially older ones may develop microphonics (humming or buzzing) over time due to aging or improper installation. This is more common in poorly stored or abused tubes.

6. **Not Always Necessary for Modern Use**

- For casual guitarists or those on a budget, modern or reissued 12AX7s (e.g., from JJ Electronics, Sovtek, or Tube Sockets) offer nearly identical performance at a fraction of the cost. The sonic differences between NOS and modern tubes are subtle and may not be noticeable to everyone.

7. **Storage and Preservation Challenges**

- NOS tubes require careful storage (e.g., in a dry, temperature-controlled environment) to prevent degradation. If not stored properly, they can develop leaks, corrosion, or other issues that reduce their lifespan.

8. **Potential for Overhyped Sound Claims**

- While NOS tubes are often praised for their "warmer" or "more natural" sound, the differences between NOS and modern tubes are often subjective. Some audiophiles may not perceive a significant advantage over well-made modern alternatives.

9. **Compatibility Issues with Some Modern Gear**

- While the 12AX7 is universally compatible, some high-end or specialized amplifiers may require specific tube types (e.g., certain Japanese or European variants). Always verify compatibility before purchasing.

10. **Ethical and Environmental Concerns**

- Purchasing NOS tubes contributes to the depletion of original stock, which may not be sustainable in the long term. Some argue that supporting modern tube manufacturers helps preserve the industry for future generations.

---

The **Raytheon CK5751WA 12AX7/ECC83 (NOS, triple mica, blackplate, square getter, low-noise)** is a **high-end, historically significant tube** that offers exceptional sound quality, reliability, and collectible value. It is ideal for **guitar amplifiers, hi-fi preamps, and critical listening applications** where the subtle nuances of a well-aged tube are desired. However, its **high cost, rarity, and sensitivity to handling** make it less practical for casual users or those on a budget.

If you are a **serious audiophile, collector, or guitarist who prioritizes vintage tone and authenticity**, this tube is a worthwhile investment. For most other users, a **modern or reissued 12AX7** (e.g., from JJ, Sovtek, or Tube Sockets) provides nearly identical performance at a fraction of the price.

---

- You are a collector or audiophile who values NOS tubes for their historical and sonic qualities.

- You are using it in a **high-end guitar amp, preamp, or critical listening setup** where the subtle differences matter.

- You have experience handling tubes and can properly store and care for it.

- You are willing to pay the premium for authenticity and longevity.

- You are a casual guitarist or hobbyist who doesn t need the extra cost or rarity.

- You prefer modern tubes for consistency and availability.

- You are on a tight budget and can achieve similar results with a well-made reissue.

- You lack the knowledge or care to properly handle and store a NOS tube.

For most guitarists, a **modern 12AX7 (e.g., JJ 12AX7A or Sovtek 12AX7)** is an excellent alternative that delivers nearly identical performance without the high cost or rarity concerns. However, if you can afford it and appreciate the nuances of NOS tubes, the Raytheon CK5751WA is a **superior choice** for those who demand the best.

Details:

Beautiful like new super low noise Raytheon Blackplate triple mica CK5751 12AX7 tube TV7 tested as at 49/46 where a reading of 32/32 is equivalent to 65% Gm/Mutual Conductance.

part #: ck5751wa prices

• $89.99-$180.00

specifications tubesocketvintagego:

• brand: Raytheon
• mpn: Ck5751wa
• type: Vacuum Preamp Tube
• country of origin: United States

returns tubesocketvintagego:

• policy: No Returns

seller tubesocketvintagego:

• city: Lufkin, Texas
• # reviews: 1917
• rating: 99.5%

payments tubesocketvintagego:

• other
• credit card: Diners-club
• wallet: Apple-pay

offer tubesocketvintagego:

• quantity: 1
• started: April 24, 2026
• options: Ship-to-home
• availability: In Stock
• sold: 0

shipping tubesocketvintagego:

• carrier: USPS
• transit: 5-11 Days
• type: Calculated
• class: Standard
• cost: $8.10
• service: USPS Ground Advantage

general tubesocketvintagego:

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

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