AMERITRON AL-811A Hf Linear Amplifier

( Brand: Ameritron ), ( Manufacturer Part Number: AL-811A ), ( Model: AMERITRON AL-811A ), ( Type: Linear Amplifier ), ( Band: Hf ), ( Country Of Origin: United States )

Review AMERITRON Hf Linear Amplifier Mint

The **Ameritron AL-811A HF Linear Amplifier** stands as a robust and versatile high-performance amplifier designed for serious radio enthusiasts, contest operators, and DXers who demand exceptional reliability and power output across the entire HF spectrum. Engineered with precision and built to endure the rigors of demanding operating conditions, this 1.5-kilowatt linear amplifier delivers clean, efficient amplification from 1.8 to 30 MHz, making it an indispensable tool for both on-the-air use and laboratory testing. At its core, the AL-811A features a **triple-tuned, air-cooled design** with a **high-efficiency Class ABB power stage**, ensuring minimal heat dissipation while maximizing power transfer to the antenna. The amplifier s **solid-state driver circuit** provides stable and consistent excitation, reducing the risk of overdriving the final RF stage and prolonging the lifespan of the tubes specifically, the **218B tetrode**, a robust and reliable choice for high-power applications. The inclusion of a **built-in RF choke and high-voltage filter** further enhances safety and performance by minimizing interference and ensuring stable operation even under heavy loading.

One of the standout features of the AL-811A is its **user-friendly control panel**, which includes a **front-panel meter** for monitoring output power, a **tuned RF output indicator**, and a **high-voltage display** for real-time monitoring of the tube s operating conditions. The amplifier also incorporates a **low-voltage protection circuit**, automatically shutting down in the event of a power supply failure or voltage sag, thereby safeguarding both the amplifier and the connected equipment. For added convenience, the AL-811A is equipped with a **remote control jack**, allowing operators to integrate it seamlessly with keyers, logging software, or other automation systems. The unit s **durable aluminum chassis** and **high-quality components** ensure long-term durability, while the **modular design** simplifies maintenance and troubleshooting, making it a practical choice for both home stations and field deployments.

Beyond its technical specifications, the AL-811A is celebrated for its **exceptional build quality and attention to detail**, reflecting Ameritron s reputation for craftsmanship in the amateur radio community. Whether used for **contesting, long-distance DXing, or emergency communications**, this amplifier consistently delivers **clean, linear amplification** with minimal distortion, ensuring that your transmitted signal remains crisp and powerful. Its **adjustable bandwidth control** allows operators to fine-tune performance for specific bands or modes, while the **built-in RF output meter** provides immediate feedback on power levels, enabling precise adjustments on the fly. For those seeking a **reliable, high-performance amplifier** that balances power, efficiency, and ease of use, the Ameritron AL-811A stands as a proven workhorse that continues to set the standard for HF linear amplifiers in the amateur radio world.

The **Ameritron AL-811A HF Linear Amplifier** is a popular choice among amateur radio operators for high-power transmission on HF bands. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the Ameritron AL-811A**

1. **High Power Output**

The AL-811A delivers **1.5 kW PEP (1.25 kW average)** on all HF bands (160m 10m), making it suitable for long-distance contacts, contesting, and weak-signal work. This power output is sufficient for most amateur radio needs, including DX operations.

2. **Wide Bandwidth Coverage**

It covers all HF bands (1.8 30 MHz) without the need for band-switching, providing seamless operation across the entire spectrum. This is particularly useful for operators who frequently move between bands.

3. **Reliability and Durability**

The AL-811A is built with robust components, including a **high-quality power transformer, MOSFET output stage, and efficient cooling system**. Many users report years of trouble-free operation, especially when used within specified limits.

4. **Moderate Cost**

Compared to some high-end linear amplifiers (e.g., those from Yaesu or Icom), the AL-811A offers excellent performance at a **relatively affordable price**, making it accessible to hobbyists and clubs.

5. **Easy to Operate**

The control panel is straightforward, with clear indicators for **input power, output power, and protection status**. It includes features like **automatic band switching (via optional control box)** and **overvoltage/overcurrent protection**.

6. **Compatibility with Common Transceivers**

The AL-811A works well with most **solid-state and tube transceivers** (e.g., Yaesu FT-1000MP, Icom IC-7800, Kenwood TS-480), though proper matching and impedance considerations are necessary for optimal performance.

7. **Good Cooling System**

It uses **two large fans** for adequate airflow, though some users note that prolonged operation at full power may require occasional maintenance (e.g., cleaning dust from the radiator).

8. **Optional Remote Control**

The **AL-811A Control Box** allows for **keying, band selection, and power monitoring** from a remote location, which is useful for fixed-station setups.

9. **Positive User Community**

The AL-811A has a **large user base**, meaning there is ample support, spare parts, and aftermarket modifications available (e.g., upgraded cooling, better shielding).

10. **Good for Contesting and DX**

Its **clean amplification** and **low distortion** make it a solid choice for competitive radio activities where power and reliability are critical.

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### **Cons of the Ameritron AL-811A**

1. **Limited Bandwidth on Lower Bands**

While it covers all HF bands, **performance on 160m (1.8 MHz) and 80m (3.5 MHz) may be less efficient** compared to higher bands due to the amplifier s design. Some users report slightly lower gain or efficiency at the lower end of the spectrum.

2. **No Built-in Automatic Antenna Tuner (AAT)**

Unlike some modern amplifiers (e.g., the **Yaesu FT-1000MP with built-in AAT**), the AL-811A **requires an external tuner** for optimal matching. This adds complexity and cost if you don t already have one.

3. **Power Consumption**

At full power, the AL-811A draws ** 1,500W from the mains**, which can be significant for home setups. This may require **dedicated circuit protection** or a **heavy-duty power supply** to avoid tripping breakers.

4. **Heat Generation**

While the cooling system is adequate, **prolonged use at high power can cause the amplifier to run warm**. Some users report that **additional ventilation** (e.g., placing it in a well-ventilated area or using a radiator fan) is necessary for long sessions.

5. **No Built-in RF Chokes or Shielding**

The AL-811A lacks **integrated RF chokes or heavy shielding**, which can lead to **RF leakage** if not properly installed. Users must take precautions (e.g., proper grounding, shielding cables) to avoid interference.

6. **No Digital Interface (Smart Control)**

Unlike newer amplifiers with **USB or CAT control**, the AL-811A relies on **analog controls or the optional control box**, which may feel outdated compared to modern setups.

7. **Some Users Report RF Feedback Issues**

A few operators mention **occasional RF feedback or arcing** if the amplifier is not properly matched or if the antenna system is poorly designed. This is more of a **user-error issue** than a flaw in the amplifier itself.

8. **No Built-in SWR Protection**

While it has **overvoltage and overcurrent protection**, it does **not automatically shut down** if the SWR is too high. Users must monitor SWR separately to avoid damaging the amplifier.

9. **Limited Aftermarket Support for Upgrades**

Unlike some amplifiers (e.g., **Yaesu FT-1000MP**), the AL-811A has **fewer aftermarket upgrades** available (e.g., no widely available "turbo" kits for higher power).

10. **No Built-in Noise Blanker or DSP**

Unlike some modern transceivers, the AL-811A does **not include noise reduction features**, meaning users must rely on their transceiver s built-in noise blankers.

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### **Conclusion**

The **Ameritron AL-811A** is a **well-proven, reliable, and powerful HF linear amplifier** that excels in **contesting, DXing, and general high-power operation**. Its **broadband coverage, moderate cost, and robust build** make it a favorite among amateur radio enthusiasts. However, it is **not without limitations**, particularly in **lower-band efficiency, lack of built-in tuning, and heat management requirements**.

If you are looking for a **budget-friendly, high-power amplifier** that delivers **consistent performance across HF bands**, the AL-811A is an excellent choice **provided you have a good antenna tuner, proper cooling, and are willing to monitor SWR**. For users who prioritize **modern features like digital control or built-in tuning**, newer amplifiers (e.g., **Yaesu FT-1000MP, Icom IC-7800 with external amp**) may be preferable.

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### **Recommendation**

- You need a **reliable, high-power (1.5 kW) amplifier** for **contesting, DX, or general HF operation**.

- You already have (or are willing to purchase) an **external antenna tuner**.

- You operate primarily on **20m 10m** (where it performs best) and occasionally on lower bands.

- You prefer a **proven, no-frills amplifier** over modern smart amplifiers.

- You are on a **moderate budget** and want good value for performance.

- You want **built-in antenna tuning** (e.g., **Yaesu FT-1000MP, Icom IC-7800 with external amp**).

- You need **digital control or smart features** (e.g., **Yaesu FT-1000MP, Elecraft K3 with external amp**).

- You operate mostly on **160m 80m** and need better efficiency on lower bands (consider a **specialized low-band amp**).

- You want **higher power output** (e.g., **2 kW amplifiers** like the **Yaesu FT-1000MP with external amp**).

The **Ameritron AL-811A remains one of the best mid-range HF amplifiers** for amateur radio operators who prioritize **power, reliability, and simplicity**. With proper care and maintenance, it will serve you well for many years. However, ensure you have the **necessary supporting equipment (tuner, cooling, shielding)** to maximize its performance and longevity.

Details:

All the power you really need and Lightweight. 600 watts output with 60 drive on all bands. Looks and works like new. Has original Ameritron 811A tubes.

Low input SWR on all bands. Very quiet and easy to tune. Appears to have very little use if any. Ameritron AL-811H 160-10 meter Amplifier.

part #: al811a prices

• $1049.99-$3149.99

specifications hamamateuradio:

• brand: Ameritron
• mpn: Al-811a
• model: Ameritron Al-811a
• type: Linear Amplifier
• band: Hf
• country of origin: United States

shipping hamamateuradio:

• class: Standard
• transit: 4-9 Days
• carrier: UPS
• cost: $79.00
• service: UPS Ground
• type: Fixed

general hamamateuradio:

• Radio Communication > Ham, Amateur Radio > Ham Radio Amplifiers
• condition: Used

payments hamamateuradio:

• wallet: Paypal
• other
• credit card: Discover

offer hamamateuradio:

• quantity: 1
• sold: 0
• started: February 8, 2026
• options: Ship-to-home
• availability: In Stock

seller hamamateuradio:

• # reviews: 4545
• rating: 100.0%
• city: Colgate, Wisconsin

returns hamamateuradio:

• policy: No Returns

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