Sugden Masterclass IA-4 Pure Class A Integrated Amplifier

Sugden Masterclass IA-4 – Pure Class A Integrated Amplifier The Sugden Masterclass IA-4 is the flagship integrated amplifier in the Masterclass range, combining pure Class A amplification with a substantial power supply, refined analogue control and a built-in MM phono stage. Designed for listeners who value tonal richness, spatial depth and long-term musical engagement, it offers a focused alternative to feature-heavy amplifiers. Overview The IA-4 builds on Sugden’s long experience with pure Class A amplification. Its output stage develops 33 watts per channel into 8 ohms, supported by a larger power supply and upgraded smoothing and output capacitors compared with the A21 series. A bespoke preamplifier section, gold-plated circuit boards, relay input switching and a precision selector contribute to a clean, carefully controlled signal path. The amplifier is handcrafted in Yorkshire by a single skilled technician. Key Benefits Natural musical presentation: pure Class A operation is designed to preserve low-level detail, tonal texture and dynamic flow. Integrated vinyl support: the built-in MM phono stage allows direct connection of a compatible turntable. Flexible analogue connectivity: line-level, tape, phono and balanced inputs accommodate a well-developed stereo system. System expansion: variable pre-out and fixed output connections support additional amplification or recording equipment. Long-term ownership: substantial construction and hand assembly reflect Sugden’s emphasis on durability and serviceability. Key Features Pure Class A integrated amplifier 33 watts per channel into 8 ohms Three line-level inputs One tape input Built-in Moving Magnet phono input One balanced input Variable preamplifier output Fixed output and loudspeaker output Remote-controlled volume, RC5 compatible Gold-plated circuit boards and relay switching Ideal For The Sugden Masterclass IA-4 is intended for serious two-channel systems built around high-quality analogue and digital sources. It is particularly relevant for listeners who prefer musical coherence and tonal refinement over extensive digital processing or network features. Its 33-watt Class A output should be matched thoughtfully with loudspeakers of suitable sensitivity and impedance, especially where larger rooms or very high playback levels are involved. Specifications Product type Pure Class A stereo integrated amplifier Inputs 3 × line level, 1 × tape, 1 × MM phono, 1 × balanced Outputs Variable pre-out, fixed output, loudspeaker output Line input sensitivity 125 mV Phono input sensitivity 2 mV MM Power output 33 W per channel into 8 Ω Frequency response 14 Hz–200 kHz, ±1 dB Bandwidth 6 Hz–300 kHz Signal-to-noise ratio Greater than 84 dB Dimensions (H × W × D) 165 × 430 × 440 mm Gross packed weight 20 kg Manufacture Handcrafted in Yorkshire, England Why We Selected This Product At ExclusivIT, we value amplifiers with a clear purpose and a coherent engineering philosophy. The IA-4 does not attempt to be a streamer, DAC or home cinema hub. Instead, it concentrates on high-quality analogue amplification, careful construction and a direct connection to the music. Its combination of pure Class A operation, useful analogue connectivity and built-in MM phono support makes it a compelling foundation for a refined stereo system. For customers who appreciate Sugden’s understated design and natural presentation, the IA-4 deserves serious consideration.