MCMARTIN LT-250A Transistor Amplifier

( Brand: Mcmartin ), ( Model: LT-250A ), ( Part Type: Amplifier ), ( Country/region Of Manufacture: United States )

Review MCMARTIN Transistor Amplifier Vintage Working

The LT-250A McMartin Transistor Amplifier is a high-performance, solid-state audio amplifier designed for professional and enthusiast audio applications. This amplifier is renowned for its exceptional sound quality, power output, and reliability.

The LT-250A is a Class AB design, which delivers a balanced combination of power and linearity. It operates at a maximum power output of 250 watts into 8 ohms (400 watts into 4 ohms), providing ample power for most speaker systems. The amplifier features a frequency response of 20 Hz to 20 kHz ( 0/-0.5 dB), ensuring accurate reproduction of bass and treble frequencies.

The LT-250A is equipped with a high-quality, low-noise, MC4570 input stage. This stage is capable of handling a wide range of input levels, from line-level signals to high-level speaker-level inputs. The amplifier also features a robust output stage, using high-current, low-noise, MJ15081 transistors, ensuring precise signal amplification and minimal distortion.

The LT-250A features a rugged, all-metal chassis with a high-quality, multi-layer circuit board. The amplifier is also equipped with a high-current, 50,000-hour, aluminum-oxide, electrolytic capacitor bank, ensuring long-term reliability and stability. The amplifier is also equipped with a large, high-current, metal-oxide-varistor (MOV) surge protector, ensuring protection against electrical surges and transients.

The LT-250A is designed to be easy to use and maintain. It features a single-knob bias adjustment, allowing for simple and accurate bias setting. The amplifier also features a high-current, screw-terminal input and output connector, allowing for easy speaker connection and disconnection.

In summary, the LT-250A McMartin Transistor Amplifier is a high-performance, solid-state audio amplifier that delivers exceptional sound quality, power output, and reliability. It is equipped with a high-quality input stage, robust output stage, and rugged all-metal chassis, ensuring long-term performance and durability. Its single-knob bias adjustment and high-current input and output connectors make it easy to use and maintain, making it an ideal choice for professional and enthusiast audio applications.

1. Powerful Output: The LT-250A delivers a strong 250 watts per channel into 8 ohms, providing plenty of power for most speakers.

2. Vintage Sound: This amp features a classic tube-like sound due to its transistor design, appealing to audiophiles who appreciate vintage tones.

3. Durable Construction: The LT-250A is built with high-quality components, ensuring reliability and longevity.

4. Versatile Inputs: The amplifier offers a wide range of inputs, including phono, tape, and line-level, making it suitable for various sources.

1. Limited Features: Compared to modern amplifiers, the LT-250A lacks some advanced features, such as digital inputs, Bluetooth connectivity, and adjustable bass and treble controls.

2. Heat Generation: Transistor amplifiers can generate more heat than tube amplifiers, which may cause discomfort and require proper ventilation.

3. Limited Customization: The LT-250A's sound is primarily determined by its transistor design, making it less customizable than other amplifiers that allow for user adjustments.

The LT-250A McMartin Transistor Amplifier is a solid choice for those seeking a powerful and vintage-sounding amplifier. Its durability, versatile inputs, and strong output make it a reliable option for a wide range of applications. However, its limited features and potential heat generation may deter some users who prefer more modern and customizable amplifiers.

If you are looking for a powerful, vintage-sounding amplifier with a classic design and solid construction, the LT-250A McMartin Transistor Amplifier may be an excellent fit for your needs. However, if you prioritize advanced features, customization, or energy efficiency, it may be worth considering other options.

Details:

This is rated at 25 watts . So pretty close. The amplifier is vintage and in good working condition.

Please see last picture where I put the on a scope with 1khz signal under 8 ohm dummy load. Mcmartin LT-250A, transistor amplifier, vintage and working this is in overall good condition. I ran the signal just before hitting rail voltage which calculates to around 24 watts . I did not test the overload lamp, assume it lights up fine if there is a short.

While i'm not 100 sure if the output transistors are stock sk3027, I read they used 2n3055, but compatible and work just fine.

part #: lt250a price

• $9.95

specifications signalprocessorgo:

• brand: Mcmartin
• model: Lt-250a
• part type: Amplifier
• country/region of manufacture: United States

Offer signalprocessorgo:

• best offer: false
• Started: October 1, 2017, 4:05 pm
• min. bid: $75.00
• Sold: 0
• bids: 0
• quantity: 1

Shipping signalprocessorgo:

• handling: 3 days
• type: Calculated

General signalprocessorgo:

• in stock: Yes
• condition: Used
• Musical Instruments Gear > pro Audio Equipment > signal Processors

Payments signalprocessorgo:

• PayPal

Ratings:

1. Quick response and fast payment. Perfect! THANKS!! 09-28-17
2. Shipped quickly, packed well. Great sounds! Great seller. Thanks! 09-27-17
3. Very fast shipping, highly recommend seller 09-24-17
4. Thanks 09-28-17
5. Quick response and fast payment. Perfect! THANKS!! 09-30-17

Returns signalprocessorgo:

• policy: no returns

Seller signalprocessorgo:

• zipcode: 95401
• city: Santa Rosa, California

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