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Integrated amplifiers — Western Electric 91E

Description, images, technical data and specifications

Western Electric 91E
Image source — © Western Electric

The engineers used a patented technology of a controlled current source in the integrated circuit. The parallel power supply topology transfers half of the current to the triode anode, which increases the output power to 20 watts per channel. The attenuator consists of discrete resistors in a ladder configuration; it is switched on and off from the circuit to obtain a logarithmic attenuation of the output signal.

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Specifications

  • Model name

    91E

  • Type

    Integrated Amplifier with DAC and Phono

  • Analog inputs (balanced)

    N/A

  • Analog inputs (single-ended)

    6

  • Input sensitivity (mV)

    N/A

  • Input impedance (balanced) (Ω)

    N/A

  • Input impedance (single-ended) (Ω)

    47 000 (MM) + 1 000 000 (MC) + 20 000 (CD)

  • Output impedance (balanced) (Ω)

    N/A

  • Output impedance (single-ended) (Ω)

    N/A

  • D/A conversion

    Yes

  • Phono MM/MC current-sensing input impedance (Ω)

    N/A

  • Output power (8Ω) (W)

    2 x 20

  • Output power (4Ω) (W)

    2 x 20

  • Gain (dBu)

    N/A

  • Frequency response low +/- 3dB (Hz)

    30

  • Frequency response high +/- 3dB (Hz)

    20 000

  • Signal to Noise Ratio (dB)

    83 (MM) + 73 (MC) + 101 (CD)

  • Total Harmonic Distortion + Noise (%)

    N/A

  • Damping factor

    N/A

  • Dimensions (mm)

    480 x 380 x 280

  • Weight (kg)

    22.2

  • Official link

    https://www.westernelectric.com/91e

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