High Quality Audio Equipment

Sugden Masterclass HA-4

  • £1810.00
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  • Product Code: SAHA-4

Sugden Masterclass HA-4 Headphone Amplifier

Sugden audio are pleased to introduce their Masterclass Series dedicated Headphone Amplifier the HA-4.

This very special Class A amplifier has been developed to extend the boundaries of ‘near field listening’ to a level of musical performance that is truly amazing.

The HA-4 has the ability to recreate all types of music in dynamic, detailed, transparent and harmonic performance, with every nuance retained. Euphonic performance which will enthuse and encourage the listener to enjoy Simply More Music.

Designed and manufactured in Sugdens, West Yorkshire factory where the in-house skills are dedicated to musical performance, aesthetic design, pride of presentation and absolute customer satisfaction.

The HA-4 is housed in a most attractive composite metal case of Aluminium and Steel, with Anodised and Powder Coated surfaces that exude quality. The HA-4 is equipped with: two inputs, two outputs, and a manual volume control. It has its own built in power supply and Euro plug mains power connector.

The two inputs are: Balanced Mode and Asymmetric Phono (RCA Single ended), both inputs being Stereo Pairs. Selection of either input is via a logic relay circuit operated by a front panel push button switch.

The two outputs are: A front panel mounted 6.35mm headphone Jack Socket and a Stereo pair of RCA phono plugs on the rear panel. The Stereo Jack Socket is of the switched type, disconnecting the rear output when the headphone jack is inserted.

The volume control, located in the centre of the front panel, has infinitely fine control for maximum user friendliness even for the most sensitive of ears.

The Electronic circuitry is a variant of Sugdens ‘VCV’ Pre Amplifier, coupled to a Pure Class A, Zero Feedback, Mosfet output stage. The circuitry has been enhanced by a Discrete Constant Voltage Series Power supply driven by a custom built single wound and shielded 43VA torroidal transformer.

This is another Sugden product of ingenuity and integrity subjectively mastered to allow its user to enjoy many years of superior musical performance.


This product is available to order only and delivery is approximately 4 weeks. Payment can be made in full at time of order by selecting Add to Basket and Buy alternatively contact us and we can take a deposit with the balance due 7 days before despatch.

Masterclass HA-4 Headphone Amplifier


Inputs: 1 x Balanced Pair XLR, 1 Stereo Pair Phono Connectors Gold Plated

Outputs: 1 x 6.35mm Phono Jack, Stereo Pair Phono Sockets.


Input impedance: 20 KOhms

Gain: 16dB

Channel Seperation >90dB

Frequency response: -0.3dB 20Hz, -0.5dB 30kHz

Signal to noise: >95dB

Output Impedance: 10 Ohm

Nett weight: 4.5 kgs

Dimensions: 80mm x 250mm x 310mm (h x w x d)

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