Sugden Audio MASTERCLASS IA-4
Image source — © Sugden Audio
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Model name
MASTERCLASS IA-4
Type
Integrated Amplifier
Analog inputs (balanced)
1
Analog inputs (single-ended)
4 + 1 (Phono)
Input sensitivity (mV)
125
Input impedance (balanced) (Ω)
N/A
Input impedance (single-ended) (Ω)
N/A
Output impedance (balanced) (Ω)
N/A
Output impedance (single-ended) (Ω)
N/A
D/A conversion
N/A
Phono MM/MC current-sensing input impedance (Ω)
N/A
Output power (8Ω) (W)
33
Output power (4Ω) (W)
N/A
Gain (dBu)
N/A
Frequency response low +/- 3dB (Hz)
14
Frequency response high +/- 3dB (Hz)
200 000
Signal to Noise Ratio (dB)
>84
Total Harmonic Distortion + Noise (%)
N/A
Damping factor
N/A
Dimensions (mm)
165 x 430 x 440
Weight (kg)
20
Official link
The Sugden Masterclass ANV-50, the 50th anniversary model in the famous series, largely pays tribute to the company's first transistor amplifier, which hit the shelves 50 years ago.
J.E.Sugden flaunts the completely manual assembly of its devices (with one master assembling the device from and to the device) – and the Sugden A21SE amplifier is no exception. The output power is low, only 2 x 30 watts at 8 ohms or 2 x 48 watts at 4 ohms, but note that the amplifier operates in Class A. The frequency band is phenomenal – 6 Hz - 280 kHz.
The model operates in pure Class A and is capable of producing 25 watts at the output. This is a compact amplifier made in vintage style.