AMPEREX 8255 Pin Vacuum Tube Amplitrex E88C

( Brand: Amperex ), ( Manufacturer Part Number: 8255 ), ( Model: E88C ), ( Type: Vacuum Tube )

Review AMPEREX Pq Gold Pin Vacuum Tube Amplitrex Tested Strong

The **Amperex 8255/E88CP Vacuum Tube** is a high-performance, dual-triode glass-envelope tube designed for demanding audio amplification applications, particularly in high-end vacuum tube amplifiers, preamplifiers, and power amplifiers where clarity, linearity, and dynamic range are paramount. Manufactured by Amperex, a trusted name in vacuum tube technology, this tube is engineered to deliver exceptional sound quality with minimal distortion, making it a favored choice among audiophiles and professional audio engineers. The **8255/E88CP** features a **dual-triode configuration**, meaning it contains two independent triode sections housed within a single glass envelope, allowing for versatile circuit design and efficient space utilization in amplifier schematics. Each triode section is meticulously crafted with a **thoriated tungsten cathode**, ensuring long-term stability and consistent emission characteristics over extended periods of use, which translates to reliable performance and reduced risk of premature failure.

The tube s **pin configuration (E88CP)** adheres to the European standard, with eight pins arranged in a compact, symmetrical layout, facilitating easy installation in amplifier chassis. The **8255** designation itself is a variant of the classic **E88CC** (or 6CK6 in American numbering), a tube renowned for its smooth, warm sound and ability to handle moderate power levels with grace. Amperex s refinement of this design enhances its robustness while preserving the tube s natural musicality, making it ideal for both vintage-style amplifiers and modern tube circuits seeking authentic analog warmth. The **glass envelope** not only provides excellent thermal dissipation but also contributes to the tube s aesthetic appeal, often becoming a centerpiece in transparent-panel amplifiers where the glow of the cathode and filaments can be observed during operation.

Under the hood, the **8255/E88CP** operates at a **filament voltage of 6.3V AC (or 12.6V DC)** and a **plate voltage of up to 250V**, depending on the specific circuit design, allowing it to function effectively in both preamp and power amplifier stages. Its **dual-triode structure** enables designers to implement push-pull configurations, phase splitting, or even independent gain stages, offering flexibility in amplifier topology. The tube s **low noise characteristics** and **high transconductance** make it particularly well-suited for driving loudspeakers with precision, while its **minimal microphony** ensures that mechanical vibrations do not interfere with audio fidelity. This makes it an excellent choice for high-gain preamplifiers, phono stages, and even guitar amplifiers where clarity and responsiveness are critical.

In terms of longevity and reliability, the **Amperex 8255/E88CP** is built to last, with a **thoriated cathode** that reduces the risk of cathode poisoning a common issue in some modern tubes and a **well-sealed glass envelope** that minimizes the ingress of contaminants. This results in a tube that can deliver **thousands of hours of service** with minimal degradation in performance, provided it is operated within its specified parameters. The tube s **smooth, non-distorting response** across the audio spectrum, from the deepest bass to the brightest treble, makes it a staple in amplifiers targeting a **natural, musical sound** rather than a harsh or overprocessed tone. Whether used in a classic **EL34-based power amp**, a **dual-triode preamp**, or a **hybrid solid-state/tube hybrid**, the **8255/E88CP** consistently delivers a sound that is both powerful and refined, appealing to audiophiles who appreciate the artistry of vacuum tube amplification.

For those seeking a tube that bridges the gap between vintage charm and modern performance, the **Amperex 8255/E88CP** is an outstanding choice. Its **dual-triode architecture**, **reliable construction**, and **superior audio characteristics** make it a versatile and enduring component in high-quality audio equipment. Whether in a custom-built amplifier or a well-regarded commercial model, this tube ensures that every note is rendered with warmth, detail, and an unmistakable analog richness that digital reproduction simply cannot replicate.

### **Pros and Cons of buying a Amperex 8255/E88CP (Pin Vacuum Tube) Amprex**

1. **High Power Handling** The 8255/E88CP is a robust power tube capable of delivering significant power output, making it suitable for high-wattage amplifiers, especially in guitar amplifiers, PA systems, and studio gear. It can handle up to **100 watts per channel** in push-pull configurations, making it ideal for demanding applications.

2. **Reliability and Durability** Amperex (now part of **Amprex**) has a long history of producing high-quality vacuum tubes, particularly for industrial and audio applications. These tubes are known for their longevity when properly maintained, often lasting **thousands of hours** under normal operating conditions.

- **E88CC** (common in Fender Bassman, Twin Reverb, and other vintage amps)

- **6L6GC** (used in Marshall, Gibson, and other high-gain amps)

- **EL34** (in some solid-state hybrid amps)

- **5881** (used in some vintage guitar amps)

This makes it a versatile choice for restoring or modifying amplifiers.

4. **Distortion Characteristics** Like the E88CC, the 8255/E88CP produces a **warm, slightly compressed, and slightly distorted** sound when overdriven, which is desirable in vintage-style guitar amplifiers. It has a **lower gain** than modern high-gain tubes (like 6550 or 6L6GC), making it better suited for **clean and moderate overdrive** tones rather than extreme distortion.

5. **Availability and Cost-Effectiveness** While not as widely stocked as some other tubes (like EL34 or 6L6), the 8255/E88CP is still **relatively affordable** compared to rare or discontinued tubes. It is often sold in bulk, making it a cost-effective option for builders or restorers.

6. **Industrial-Grade Construction** Amperex tubes were originally designed for **radio frequency (RF) applications**, meaning they are built to withstand **high voltages and currents** better than some audio-specific tubes. This can translate to **better reliability in high-power setups**.

7. **Minimal Microphonic Noise** Unlike some cheaper or older tubes, the 8255/E88CP generally has **low microphonic response**, meaning it is less likely to pick up unwanted vibrations from nearby speakers or cabinets.

---

1. **Limited Modern Availability** While still produced, the 8255/E88CP is **not as commonly stocked** as tubes like EL34, 6L6, or 5881. This means you may need to **order in advance** or from specialty suppliers, which can lead to **longer lead times**.

2. **Higher Voltage Requirements** The 8255/E88CP typically requires **higher B voltages** (often **500V 600V**) compared to some modern tubes (e.g., EL34 runs at 300V). This means:

- Some amplifiers may need **modifications** (e.g., upgrading power transformers or rectifiers) to safely operate it.

- It is **not ideal for low-voltage or solid-state hybrid amps** designed for lower-power tubes.

3. **Slightly Harsher Sound Than E88CC** While pin-compatible, the **8255/E88CP has a slightly different sound character** compared to the original E88CC. Some audiophiles report it has a **more aggressive, slightly "harsher" high-end** and **less smooth low-end**, which may not suit all amplifier designs.

4. **Sensitivity to Poor Power Supply Conditions** Like most power tubes, the 8255/E88CP is **sensitive to voltage fluctuations, poor grounding, and dirty power supplies**. If the amplifier s power section is not well-regulated, the tube may **overheat or fail prematurely**.

5. **Not Ideal for Extreme Gain Stages** While it can handle moderate overdrive, the 8255/E88CP is **not as forgiving as high-gain tubes** (e.g., 6550, 6L6GC, or KT88). In **high-gain or modern amp designs**, it may **clip too easily** or produce **unwanted distortion characteristics** that are too aggressive for some players.

6. **Replacement Parts Scarcity** If the tube fails, finding **exact replacements** (especially from Amperex) can be difficult. Some aftermarket brands (e.g., **Sony, Philips, or Chinese knockoffs**) produce compatible tubes, but their **lifespan and sound quality** may vary.

7. **Potential for Early Failure in Poorly Designed Amps** If an amplifier has **poor heat dissipation, inadequate filament voltage regulation, or a weak power transformer**, the 8255/E88CP may **burn out faster** than expected. Always ensure the amp is **properly built and maintained**.

---

### **Conclusion & Recommendation**

#### **Who Should Buy the Amperex 8255/E88CP?**

- **Guitar Amplifier Builders/Restorers** If you re working on a **vintage-style amp** (e.g., Fender Bassman, Twin Reverb, or similar) that originally used an E88CC but is now hard to find, the 8255/E88CP is a **solid, reliable replacement**.

- **PA System or Studio Amplifier Users** If you need a **high-power, durable tube** for live sound or studio monitoring, the 8255/E88CP s **robust construction** makes it a good choice.

- **Players Preferring Warm, Slightly Distorted Tones** If you like the **mid-century American tone** (similar to E88CC but with a slightly more aggressive edge), this tube fits well in **clean and moderate overdrive** setups.

- **Budget-Conscious Buyers** Compared to **rare or discontinued tubes**, the 8255/E88CP offers **good value** without sacrificing too much performance.

#### **Who Should Avoid the Amperex 8255/E88CP?**

- **Modern High-Gain Amp Users** If you re running a **Marshall, Mesa, or high-gain boutique amp**, a **6550, 6L6GC, or KT88** would be a **better fit** for extreme distortion and sustain.

- **Low-Voltage or Solid-State Hybrid Amp Owners** If your amp runs at **low B voltages (under 400V)**, the 8255/E88CP may **not perform optimally** and could require modifications.

- **Players Seeking Ultra-Smooth, Clean Tones** If you prefer **EL34 or 6L6GC tones** (smoother, more modern), the 8255/E88CP s **harsher high-end** may not be ideal.

- **Those Who Prioritize Ease of Replacement** If you want **easy access to spare tubes**, EL34, 6L6, or 5881 may be **more widely available** in some regions.

**Vintage-style guitar amplifiers** (Fender, Gibson, or similar)

**PA systems and studio monitors** needing high power and reliability

**Players who enjoy a warm, slightly distorted, mid-century tone**

**Budget-conscious builders** who need a durable, pin-compatible replacement

**If you re unsure, test it in your amp first** some amplifiers may sound better with **EL34 or 6L6GC**, depending on your preferred tone.

- Use a **properly regulated power supply** (avoid voltage spikes).

- Ensure **adequate filament voltage** (usually **6.3V, 1.5A per tube**).

- Allow **proper cooling** (avoid overcrowding in chassis).

- Replace **every 5 10 years** if used frequently, as even high-quality tubes degrade over time.

For most **vintage amp restorations or classic tone seekers**, the **8255/E88CP is a well-made, reliable, and cost-effective option**. However, for **modern high-gain setups**, other tubes may be more suitable.

Details:

Tested strong on an Amplitrex AT1000 tube tester at 78% IP and 81% gm as photographed.

part #: 8255 prices

• $24.88-$75.45

specifications tubesocketvintagego:

• brand: Amperex
• mpn: 8255
• model: E88c
• type: Vacuum Tube

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

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• # reviews: 6309

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