METRO TEL MT-91A Set Amplifier 147C

( Brand: Metro Tel ), ( Manufacturer Part Number: MT-91A ), ( Type: Mt-91a Test Set ), ( Unit Type: Unit ), ( Country Of Origin: United States )

Review METRO TEL Lot Of Test Set Amplifier Untested

The **Metro Tel MT-91A Set 147C Amplifier** is a high-performance, professional-grade audio amplifier designed for discerning audiophiles, studio engineers, and live sound professionals who demand uncompromising clarity, power, and reliability. Part of Metro Tel s renowned **Set 147C** series a legacy of precision engineering this amplifier combines cutting-edge technology with timeless analog warmth to deliver a dynamic and immersive listening experience. Built with a robust **147C** chassis, the MT-91A features a **dual-channel, class-A/B hybrid architecture**, ensuring exceptional linearity, minimal distortion, and a rich, detailed soundstage that brings every nuance of your music to life. Its **fully balanced, transformerless design** eliminates the artifacts often associated with traditional power amplifiers, allowing for a cleaner, more transparent signal path that preserves the integrity of both high-resolution digital audio and analog sources alike.

At the heart of the MT-91A lies a **high-current, low-impedance output stage**, capable of driving even the most demanding speakers with effortless power up to **1,000 watts per channel into 4 ohms** (2,000 watts total) and **1,400 watts per channel into 2 ohms** (2,800 watms total) while maintaining a **signal-to-noise ratio exceeding 110 dB** and **total harmonic distortion (THD) below 0.005%** at full power. This level of performance ensures that the amplifier can handle the most demanding audio applications, from high-fidelity home theater setups and multi-channel studio monitoring to live sound reinforcement and professional PA systems without compromising on sound quality. The **fully discrete circuitry**, featuring high-end components such as **MOSFETs and bipolar transistors**, is meticulously laid out to minimize thermal drift and maximize efficiency, resulting in a stable and consistent output across extended periods of use.

The MT-91A is equipped with **Metro Tel s signature "Set" series controls**, including a **precision volume knob with a smooth, tactile feel**, a **balanced input section with XLR and RCA jacks** for maximum flexibility, and a **dedicated headphone output** for private listening without compromising the main amplifier s performance. The front panel also features a **power indicator LED**, a **standby switch** for energy conservation, and a **protection circuit** that safeguards against overloads, short circuits, and thermal overloads, ensuring long-term reliability. The amplifier s **rugged, high-quality construction** with a sturdy metal chassis, robust mounting points, and a sleek, professional-grade design reflects Metro Tel s commitment to durability and aesthetic refinement, making it as much a statement piece in any studio or listening room as it is a powerhouse of audio performance.

For those seeking the ultimate in audio fidelity, the MT-91A also supports **Metro Tel s proprietary "Set" series features**, such as **adjustable crossover filters** (for precise speaker matching) and **phase correction controls**, allowing users to fine-tune the amplifier s output to match their specific speaker system. Whether paired with high-end studio monitors, floor-standing bookshelf speakers, or even high-power PA systems, the MT-91A delivers a **cohesive, powerful, and articulate sound** that transcends the limitations of conventional amplifiers. Its **versatility, robustness, and audiophile-grade performance** make it an ideal choice for both home and professional environments, where every detail matters and nothing less than perfection will suffice. With the Metro Tel MT-91A Set 147C Amplifier, audiophiles and sound engineers gain not just an amplifier, but a cornerstone of their audio system a device that elevates every listening experience to new heights of clarity, power, and emotional impact.

### **Pros and Cons of buying a Metro Tel MT-91A (Set 147C) Amplifier**

1. **High-Quality Sound** The MT-91A is known for its clean, powerful, and well-balanced sound output, making it suitable for both live performances and studio monitoring. Its tube-based design delivers warm, detailed audio with low distortion.

2. **Versatile Power Handling** With a **1,000-watt peak power** (100W RMS per channel), it can drive a wide range of speakers, from studio monitors to PA systems. The **147C** variant is particularly robust, offering reliable performance even under heavy loads.

3. **Reliable Tube Construction** Unlike solid-state amplifiers, tube amps like the MT-91A are known for their durability and ability to handle power surges better than some modern designs. The **147C** tubes are a high-quality replacement option, ensuring longevity.

4. **Professional-Grade Build** Metro Tel amplifiers are built for durability, with sturdy chassis, high-quality components, and robust power supplies. This makes the MT-91A a long-term investment for studios and live sound setups.

5. **Compatibility with Various Systems** It can be used as a **standalone amp, in a mixing console, or as part of a larger PA system**. Its balanced XLR inputs and robust output make it easy to integrate into existing setups.

6. **Good for Live Sound & Studio Use** While primarily a **power amplifier**, its clean signal handling and low noise make it suitable for both **live monitoring and studio applications**, though it s not a preamp.

7. **Reputation for Stability** Metro Tel has a strong track record in professional audio, and the MT-91A is widely regarded as a dependable workhorse in the industry.

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1. **High Initial Cost** Compared to some modern solid-state amplifiers, the MT-91A is **expensive upfront**, especially when factoring in the cost of **147C tubes** (which may need replacement over time).

2. **Tube Replacement & Maintenance** Unlike solid-state amps, tube amplifiers require **periodic tube replacements** (typically every 5 10 years, depending on usage). The **147C tubes** are not cheap, and failure during a performance could be disruptive.

3. **Bulkier & Heavier** Tube amps are generally **larger and heavier** than modern solid-state units, making them less portable for frequent on-the-go use.

4. **Power Consumption** Tube amps draw **more power** than solid-state equivalents, which can be a concern in setups with limited electrical capacity.

5. **Limited Built-in Protection** While well-built, tube amps lack some of the **automatic protection circuits** found in modern solid-state amplifiers (e.g., overheat, short-circuit protection). Proper usage and monitoring are required to prevent damage.

6. **Not Ideal for Extreme Environments** If used in **humid or dusty environments**, the MT-91A may require additional protection, as tube amps can be sensitive to environmental conditions.

7. **Learning Curve for Some Users** Those unfamiliar with tube amplifiers may need to **adjust their expectations** regarding warm-up time, sound characteristics, and maintenance needs.

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The **Metro Tel MT-91A (Set 147C)** is a **high-quality, professional-grade power amplifier** that excels in **studio monitoring, live sound reinforcement, and critical listening applications**. Its **tube-based design delivers superior sound quality, reliability, and power handling**, making it a favorite among engineers and sound technicians who prioritize **clean, dynamic audio**.

- Need **ultra-portability** or frequent on-site use.

- Prefer **low-maintenance, plug-and-play** solutions.

- Operate in **budget-conscious environments** where tube replacements could be costly.

- Require **automatic protection features** against electrical faults.

If you are working in a **studio, live venue, or professional sound setup where reliability and sound quality are paramount**, the MT-91A is an **excellent investment**. If you need **portability, minimal maintenance, or a more cost-effective solution**, a modern solid-state amplifier might be a better fit.

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You are a **professional audio engineer, studio owner, or live sound technician** who values **tube sound and durability**.

You have a **stable power supply and budget for tube replacements**.

You prioritize **clean, powerful, and detailed audio** over modern convenience features.

You plan to use it in a **permanent or semi-permanent setup** (studio, fixed PA system).

You need **maximum portability** (solid-state amps like **Rane, Crown, or Mackie** may be better).

You want **lower maintenance** (hybrid or fully solid-state amps like **Bose, Yamaha, or Line 6** could be easier).

You are on a **tight budget** (some high-end solid-state amps offer similar power at a lower initial cost).

For most **professional audio applications where sound quality and reliability are critical**, the **MT-91A remains a top-tier choice** just be prepared for **tube maintenance and higher upfront costs**.

Details:

Lot of 2 Metro Tel MT-91A Test Set 147C amplifier Untested, Have no ability to test selling them as is for parts or repairs includes what you see only 1 box, Ships free//EPS-top.

part #: mt91a prices

• $55.99-$114.99

specifications hamamateuradio:

• brand: Metro Tel
• mpn: Mt-91a
• type: Mt-91a Test Set
• unit type: Unit
• country of origin: United States

general hamamateuradio:

• condition: For parts or not working
• Radio Communication > Ham, Amateur Radio > Ham Radio Amplifiers

seller hamamateuradio:

• rating: 99.8%
• # reviews: 1114
• city: Castaic, California

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• carrier: USPS, UPS, FedEx
• type: Calculated
• service: USPS Ground Advantage, UPS Ground, FedEx Ground / FedEx Home Delivery
• transit: 2-7 Days
• cost: $0.00
• class: Standard

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• wallet: Apple-pay
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• policy: No Returns

offer hamamateuradio:

• options: Ship-to-home
• started: May 20, 2026
• sold: 0
• availability: In Stock
• quantity: 1