RCA G-1625 Beam Tetrode Tube Nos VT-136

( Brand: Rca ), ( Manufacturer Part Number: G-1625 ), ( Type: Output Beam Tetrode ), ( Country Of Origin: Ukraine )

Review RCA 1625 Beam Tetrode Tube Tested Nos

The RCA G-1625 (also designated as the VT-136) is a rare and highly sought-after beam tetrode vacuum tube, renowned for its exceptional performance in high-fidelity audio amplification and radio frequency applications. Introduced by Radio Corporation of America (RCA) in the mid-20th century, this tube belongs to the 1625 series, a line celebrated for its robust construction, superior linearity, and minimal distortion, making it a favorite among audiophiles and vintage electronics enthusiasts. The VT-136 is a beam tetrode, characterized by its unique electrode configuration that combines the benefits of both triodes and tetrodes offering high gain while reducing the risk of parasitic oscillations, which are common in traditional tetrodes. Its glass envelope is sealed with a metal base, featuring a robust octal-style pin configuration that ensures reliable and secure mounting in chassis or tube sockets. The tube s internal structure includes a carefully balanced beam-forming plate and screen grid, designed to optimize electron flow and deliver a smooth, dynamic sound signature with rich harmonics and minimal crossover distortion. Ideal for use in preamplifiers, power amplifiers, and high-end audio equipment, the G-1625 excels in applications where clarity, warmth, and musicality are paramount. Its historical significance, combined with its technical prowess, makes it a prized component for both restoration projects and modern builds seeking to emulate the golden era of analog sound. Whether integrated into a classic amplifier circuit or repurposed in a custom audio system, the RCA G-1625 VT-136 remains a testament to RCA s engineering excellence and a cornerstone of vintage tube technology.

### Pros and Cons of Buying RCA G-1625 (VT-136) Beam Tetrode Tubes

1. **High Performance in Amplification** The VT-136 is a high-mu (amplification factor) beam tetrode, making it ideal for high-gain applications such as preamplifiers, power amplifiers, and audio amplifiers. Its design allows for efficient power handling and low distortion in certain configurations.

- **Preamplifiers** (e.g., in vintage tube amplifiers)

- **Power amplifiers** (e.g., in guitar amps like the Fender Twin Reverb)

- **RF amplifiers** (e.g., in early radio receivers)

- **Oscillators and modulators** (due to their stable characteristics)

3. **Vintage and Collectible Value** The G-1625/VT-136 is a well-regarded tube in the tube community, especially among audiophiles and vintage electronics enthusiasts. Well-preserved examples can hold value, and some users seek them for restoration projects.

4. **Compatibility with Classic Equipment** Many vintage amplifiers, radios, and audio gear from the mid-20th century (1950s 1970s) were designed to use this tube. Replacing them in original equipment ensures proper functionality and sound quality.

5. **Stable and Reliable Operation** When properly driven and maintained, these tubes offer consistent performance over time, making them a dependable choice for critical audio applications.

6. **Aesthetic and Historical Appeal** For collectors and hobbyists, the physical appearance and historical significance of RCA tubes add to their appeal. The G-1625 has a classic look that many appreciate.

7. **Lower Power Consumption Compared to Modern Alternatives** In some cases, tube amplifiers using these tubes can be more energy-efficient than solid-state equivalents, especially in lower-power applications.

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1. **Limited Availability and High Cost** New production of the VT-136 has been discontinued for decades. Prices for new or reconditioned tubes can be high, often ranging from $50 to over $150 depending on condition and seller. Used tubes may also be scarce, driving up costs.

2. **Sensitivity to Driving Conditions** Beam tetrodes like the VT-136 require careful plate voltage and grid bias settings to avoid distortion or premature failure. Overdriving the tube can lead to grid current, which reduces lifespan and degrades sound quality.

3. **Short Lifespan Compared to Modern Tubes** While not extremely short, the VT-136 typically has a lifespan of 500 1,000 hours under normal use. This is shorter than some modern tubes designed for longevity (e.g., 2 3,000 hours). Frequent replacements may be necessary for critical applications.

4. **Maintenance and Replacement Challenges** Finding replacement parts (e.g., new tubes, sockets, or matching tubes) can be difficult. Some users report issues with compatibility in modern circuits due to changes in component standards.

5. **Sound Characteristics Can Be Polarizing** While many audiophiles praise the VT-136 for its warm, detailed sound, others find it lacks the punch or clarity of modern tubes or certain vintage alternatives (e.g., the 6L6 or EL34). Subjective preferences may make it less appealing to some listeners.

6. **Risk of Failure During Operation** Like all tubes, the VT-136 can fail suddenly (e.g., due to grid emission, filament burnout, or internal shorts). This can be frustrating in critical applications where downtime is undesirable.

7. **Environmental Sensitivity** Tubes are sensitive to humidity, dust, and electrical interference. Improper storage or handling can reduce their lifespan or cause premature failure.

8. **No Long-Term Warranty or Support** Unlike modern electronics, tubes do not come with warranties or manufacturer support. Users must rely on their own knowledge or third-party resources for troubleshooting.

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The RCA G-1625 (VT-136) beam tetrode is a high-performance tube with a strong following among audiophiles and vintage electronics enthusiasts. Its pros such as versatility, high gain, and historical significance make it a valuable component for specific applications, particularly in classic amplifiers and audio gear. However, its cons including high cost, limited availability, sensitivity to driving conditions, and shorter lifespan can be significant drawbacks for casual users or those seeking modern convenience.

For **purists, collectors, or those restoring vintage equipment**, the VT-136 is often worth the investment due to its sound quality and historical relevance. For **modern users or those prioritizing convenience and longevity**, alternatives like the EL34, 6L6, or modern tube replacements (e.g., the 6550) may be more practical choices.

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- You are restoring or maintaining vintage equipment that specifically requires this tube (e.g., Fender Twin Reverb, early tube amps).

- You are an audiophile seeking the tube s unique sound characteristics in a high-end audio setup.

- You are willing to invest in proper storage, handling, and replacement strategies to mitigate its limitations.

- You are a beginner or lack experience with tube maintenance and troubleshooting.

- You prioritize longevity, ease of replacement, or modern performance over vintage authenticity.

- You are working on a budget where the high cost of the VT-136 is prohibitive.

For those unsure, testing a used VT-136 in a non-critical application (e.g., a spare amplifier) can help determine if its sound and performance justify the investment. Always purchase from reputable sellers to ensure tube quality and authenticity.

Details:

This product is ideal for collectors and enthusiasts of vintage audio video equipment, offering a piece history with proven functionality. THIS TUBE TESTED VERY CLOSE TO NEW SPECS BOX WAS TRASH This particular model, with the 1625 designation, is a high-quality output beam tetrode tube that has been tested NOS. The RCA 1625 VT-136 Beam Tetrode Tube is a vintage electronic component that was manufactured by in Ukraine.

part #: g1625 prices

• $20.00-$45.00

specifications tubesocketvintagego:

• brand: Rca
• mpn: G-1625
• type: Output Beam Tetrode
• country of origin: Ukraine

payments tubesocketvintagego:

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

seller tubesocketvintagego:

• rating: 99.7%
• # reviews: 667
• city: Florence, Oregon

offer tubesocketvintagego:

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

returns tubesocketvintagego:

• policy: No Returns

general tubesocketvintagego:

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

shipping tubesocketvintagego:

• type: Fixed
• carrier: USPS
• cost: $5.58
• transit: 8-12 Days
• class: Standard
• service: USPS Ground Advantage

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