Sugden Masterclass PA-4 – Class A MM/MC Phono Preamplifier

The Sugden Masterclass PA-4 is a dedicated phono preamplifier for serious vinyl systems, combining two Moving Coil inputs, one Moving Magnet input and carefully engineered Class A circuitry. Designed for listeners who want a refined analogue front end with practical cartridge flexibility, it preserves the natural character, atmosphere and low-level detail that make vinyl playback so rewarding.

Overview

The PA-4 provides three separate phono inputs: two for Moving Coil cartridges and one for Moving Magnet. This allows more than one turntable or tonearm to remain connected, making it particularly useful for advanced analogue systems or listeners who regularly alternate between cartridges.

Sugden uses a Class A current-feedback circuit for the Moving Coil stage and a Class A voltage-feedback circuit for the Moving Magnet stage. RIAA correction is incorporated within the MM stage’s negative-feedback loop, while DC servo circuits allow the musical signal to remain directly coupled from the MC input through to the final output.

Key Benefits

• Flexible cartridge support: two MC inputs and one MM input accommodate a wide range of turntables and cartridges.
• Selectable MC loading: front-panel selection between 100Ω and 470Ω supports effective matching with many Moving Coil designs.
• Low-noise analogue architecture: dedicated Class A gain stages are designed to preserve subtle musical information.
• Dual line outputs: two outputs allow convenient connection to more than one amplifier or recording component.
• Long-term ownership: gold-plated circuit boards and hand assembly reflect Sugden’s emphasis on stability and serviceability.

Key Features

• Dedicated MM and MC phono preamplifier
• Two Moving Coil inputs
• One Moving Magnet input
• Two line-level outputs
• Class A current-feedback MC stage
• Class A voltage-feedback MM stage
• Selectable MC loading: 100Ω or 470Ω
• 47kΩ MM input loading
• Front-panel MC1, MC2 and MM selection
• Standby control and input indication
• Gold-plated circuit boards
• Handmade in Yorkshire, England

Ideal For

The Sugden Masterclass PA-4 is intended for dedicated vinyl systems using high-quality MM or MC cartridges. It is especially relevant for listeners with multiple turntables, interchangeable tonearms or more than one cartridge permanently installed.

Its adjustable MC loading makes it a strong partner for premium low-output Moving Coil cartridges, while the dedicated MM input supports conventional Moving Magnet designs without requiring an additional phono stage.

Specifications

Why We Selected This Product

At ExclusivIT, we value phono stages that combine careful analogue engineering with genuinely useful flexibility. The PA-4 is particularly appealing because it supports three connected cartridges without reducing the design to a feature-driven switching box.

Its dedicated Class A MM and MC circuitry, selectable loading and dual outputs make it a serious long-term foundation for a premium vinyl system. For listeners who value tonal naturalness, low-noise performance and the ability to evolve their analogue setup over time, the Sugden Masterclass PA-4 deserves close consideration.