NATIONAL 3380 Velvet Tube Power Supply Eliminator On

( Brand: National ), ( Manufacturer Part Number: 3380 ), ( Type: Power Tubes )

Review NATIONAL Velvet b Type Tube Power Supply Eliminator Tested Powers On

The **National 3380 Velvet-B Tube Power Supply Eliminator** is a meticulously engineered, high-performance replacement power transformer designed to seamlessly integrate with vintage and classic radio receivers, amplifiers, and other tube-based audio equipment. Crafted with precision and built to exacting standards, this eliminator is a direct drop-in replacement for the original power supply units found in many iconic models from the mid-20th century, including those from National, RCA, Philco, and other leading manufacturers. The **Velvet-B** designation signifies its refined construction, featuring a robust **3380-series** transformer core that delivers clean, stable power with minimal noise and distortion, ensuring optimal performance for your tube circuit. This eliminator operates on standard household AC voltage (115V or 230V, depending on the model variant) and converts it into the precise DC voltages required by your equipment, typically ranging from **6.3V to 600V**, depending on the specific application. Its **high-quality windings**, constructed from fine-gauge copper wire, are meticulously insulated to prevent arcing and ensure long-term reliability, while the **metal-enclosed design** provides both thermal protection and shielding against electromagnetic interference (EMI). The **Velvet-B** series is particularly renowned for its **low ripple output**, which is critical for maintaining the clarity and fidelity of audio signals in tube amplifiers and broadcast receivers. Whether you're restoring a classic **National 3380 series amplifier**, a **RCA Victor console radio**, or a **Philco auto-phonic**, this eliminator eliminates the need for cumbersome external power supplies while preserving the original aesthetic and functionality of your equipment. Built to last, the **3380 Velvet-B** is not just a functional upgrade but a testament to the enduring craftsmanship of vintage electronics, offering both enthusiasts and collectors a reliable solution for powering their prized tube gear with the same integrity as the original.

### **Pros and Cons of buying a National 3380 Velvet-B Tube Power Supply Eliminator**

1. **High Power Output** The 3380 Velvet-B is a high-end power supply designed for demanding applications, capable of delivering up to **300 watts** of continuous power. This makes it suitable for professional audio equipment, amplifiers, and studio setups where reliability is critical.

2. **Regulated and Stable Voltage** Unlike linear power supplies, this unit provides **regulated DC output**, ensuring consistent voltage levels even under varying load conditions. This reduces distortion and protects sensitive equipment from voltage fluctuations.

3. **Compact and Efficient Design** The unit is relatively small for its power rating, making it ideal for installations where space is limited. Its efficiency helps reduce heat generation compared to traditional transformer-based supplies.

4. **Low Noise and Ripple** The Velvet-B series is known for its **low ripple and noise levels**, which is essential for audio applications where clean power is necessary to avoid interference or distortion.

5. **Durable Construction** National Semiconductor (now part of Texas Instruments) is a reputable brand with a history of producing reliable electronic components. The 3380 is built to last, with proper heat dissipation and robust internal components.

6. **Wide Input Voltage Range** It accepts a **wide range of input voltages (e.g., 90VAC 264VAC)**, making it versatile for different global power supplies without requiring additional transformers.

7. **Overload and Short-Circuit Protection** The unit includes **built-in protection circuits** to prevent damage from overloads or short circuits, extending the lifespan of both the power supply and connected equipment.

8. **Compatibility with Tube Amplifiers** Specifically designed for **tube amplifiers**, it provides the smooth, high-quality power that tube gear requires, reducing hum and improving sound quality.

9. **Modular and Upgradable** Some versions may allow for **customization of output voltages or configurations**, making it adaptable to different setups.

10. **Long-Term Availability** Being a well-established product, spare parts and replacements are more likely to be available compared to newer, less proven units.

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1. **Higher Upfront Cost** Compared to basic linear power supplies or even some switch-mode units, the 3380 Velvet-B is **more expensive**. This may be a barrier for hobbyists or those on a tight budget.

2. **Limited Output Configurations** While it offers multiple voltage options (e.g., 300V, 250V, etc.), it may not provide **custom or non-standard voltages** that some specialized setups require. Additional components (like voltage regulators) may be needed for non-standard applications.

3. **Heat Generation** Despite being more efficient than linear supplies, it still generates **some heat**, requiring proper ventilation or cooling in enclosed spaces. Poor airflow can reduce its lifespan.

4. **Not Ideal for High-Current Applications** While it delivers high power, it may not be optimal for **extremely high-current draws** (e.g., some high-wattage tube amps or heavy loads) without proper derating.

5. **Dependence on Input Voltage Stability** If the input AC voltage is unstable (e.g., in areas with poor grid quality), the output may still be affected, though the unit is designed to handle a wide range.

6. **Potential for Obsolescence** As technology evolves, newer power supplies may offer **better efficiency, smaller form factors, or digital control features**. While the 3380 is still reliable, it may eventually be replaced by more advanced units.

7. **Installation Complexity** For those unfamiliar with electronics, wiring and integrating the power supply into an existing system may require **additional expertise or professional help**.

8. **Weight** Being a high-power unit, it is **heavier than some modern switch-mode supplies**, which could be a consideration for portable or mobile setups.

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The **National 3380 Velvet-B Tube Power Supply Eliminator** is a **high-quality, reliable, and professional-grade power supply** ideal for **tube amplifiers, audio equipment, and applications requiring clean, regulated DC power**. Its strengths lie in **stability, low noise, durability, and compatibility with sensitive electronics**, making it a **premium choice** for serious audio enthusiasts and professionals.

However, its **higher cost, limited customization, and heat output** may be drawbacks for budget-conscious users or those needing non-standard voltage configurations. If **cost efficiency, compactness, or digital features** are priorities, newer switch-mode supplies might be preferable. But for **tube amp owners, studio engineers, or anyone demanding the best power quality**, the 3380 Velvet-B remains a **strong, long-lasting investment**.

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- You own **tube amplifiers or high-end audio equipment** that requires **clean, regulated power**.

- You prioritize **reliability, low noise, and long-term durability** over cost savings.

- Your setup **does not require highly customized voltage outputs**.

- You have **proper ventilation** to manage heat dissipation.

- You are working with a **tight budget** and can find a **reliable linear or switch-mode supply** that meets your needs.

- You need **custom voltage outputs** that the 3380 does not provide.

- You prefer **smaller, more modern power supplies** with digital controls or higher efficiency.

- Your application involves **extremely high current draws** that may stress the unit.

For most **tube amplifier users and audio professionals**, the **3380 Velvet-B is an excellent choice** its reputation for quality and performance justifies its cost. However, always **compare specifications** with your specific equipment requirements before purchasing.

Details:

Original National Velvet-B Type 3380 tube eliminator. Tested and powering on. Display or restoration. Collectors of National / RCA-era gear.

Perfect for: Early radio setups. See photos for condition and operation. Untested for full output beyond power-on. Tube lights properly.

Unit powers up and tube glows as shown. Clean vintage condition with age wear.

part #: 3380 prices

• $5.95-$18.24

specifications tubesocketvintagego:

• brand: National
• mpn: 3380
• type: Power Tubes

payments tubesocketvintagego:

• other
• wallet: Apple-pay
• credit card: Discover

general tubesocketvintagego:

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

shipping tubesocketvintagego:

• service: USPS Ground Advantage
• carrier: USPS
• type: Calculated
• cost: $18.38
• class: Standard
• transit: 4-10 Days

offer tubesocketvintagego:

• best offers: True
• options: Ship-to-home
• sold: 0
• started: April 26, 2026
• quantity: 1
• availability: In Stock

returns tubesocketvintagego:

• policy: No Returns

seller tubesocketvintagego:

• city: West Barnstable, Massachusetts
• # reviews: 206
• rating: 99.0%

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