The MC1502 blends the sonic character of vacuum-tube amplification (warmth, richness, harmonic complexity) with modern power capability and reliability. Because it delivers full 150 W per channel into various loads, it handles demanding speakers fairly well, even though 150 W may not match extreme high-power amps. Its tube complement and transformer output provide a sound that many describe as open, dynamic, and sonically engaging.

Practical Considerations & System Integration

• Speaker matching: While 150 W is substantial, ensure your loudspeakers are of sufficient efficiency to make full use. Low-sensitivity speakers may not get maximum performance compared to higher-power solid-state amps.

• Ventilation: Large tube amplifiers generate significant heat. Ensure adequate clearance and airflow around the unit to maintain reliability.

• Maintenance: Tube amps may require eventual tube replacement or bias checking. The MC1502’s design includes robust tube sockets (ceramic base, gold-plated contacts) for durability. synergyaudio.com

• System synergy: Best paired with high-quality preamplifier and source components to let the amplifier shine. Balanced connections recommended for lowest noise floor.

• Aesthetic & build: Visually and physically substantial — it will command space and presence in your system rack.

• Cost & value: As a premium tube amplifier, it carries cost accordingly; investment is justified for those seeking tube character with modern build quality.

Key Features

• 150 Watts per Channel into 2, 4 or 8 Ohms:
  The MC1502 delivers 150 watts per channel via transformer-coupled outputs, ensuring consistent power across different speaker impedances.

• Unity Coupled Circuit Design:
  McIntosh’s proprietary output transformer design allows the amplifier to deliver full rated power at any impedance, maintaining sonic purity and low distortion.

• Tube Complement:
  Equipped with eight KT88 output tubes (four per channel) and eight small-signal tubes (four 12AX7A and four 12AT7), the MC1502 produces a lush, dynamic, and harmonically rich sound while offering excellent power handling.

• Sentry Monitor™ Protection:
  This circuit monitors the output current and automatically shuts down the amplifier if operating limits are exceeded, protecting both tubes and speakers.

• High-Quality Construction:
  Features include a polished stainless-steel chassis, protective tube cage, ceramic tube sockets with gold-plated contacts, and improved air circulation for enhanced cooling and tube longevity.

• Connectivity:
  Balanced (XLR) and unbalanced (RCA) inputs are provided, along with heavy-duty Solid Cinch™ speaker binding posts for secure, low-resistance connections.

• Classic McIntosh Design:
  The amplifier maintains McIntosh’s traditional aesthetic — a black glass front panel, illuminated logo, and robust chassis with timeless appeal.

Technical Specifications

• Power Output: 150 watts per channel into 2, 4, or 8 ohms

• Number of Channels: 2 (stereo)

• Circuit Type: Vacuum tube amplifier using Unity Coupled Transformer

• Tube Complement: 8 × KT88, 4 × 12AX7A, 4 × 12AT7

• Total Harmonic Distortion (THD): ≤ 0.5% from 250 mW to rated power (20 Hz–20 kHz); < 0.20% at 1 watt

• Signal-to-Noise Ratio (S/N): 112 dB below rated output

• Dynamic Headroom: 1.2 dB

• Damping Factor: Greater than 18

• Frequency Response: +0 / -0.25 dB (20 Hz–20 kHz); +0 / -3.0 dB (10 Hz–70 kHz)

• Input Impedance: 20 kΩ balanced, 47 kΩ unbalanced

• Input Sensitivity: 2.5 V balanced / 1.25 V unbalanced for rated output

• Inputs: 2 balanced (XLR), 2 unbalanced (RCA)

• Speaker Outputs: Gold-plated Solid Cinch™ binding posts for 2, 4, and 8 ohm connections

• Power Requirements: 100V, 120V, or 230V AC depending on market

• Dimensions (W × H × D): 18.25″ × 10.25″ × 21″ (46.4 × 26 × 53.3 cm)

• Weight: 118 lbs (53.5 kg) net; 135 lbs (61.2 kg) shipping