Unitra Diora (Crown) WS 442, 1989, made in Poland

Link: unitraklub


сборка по внутреннему клейму 1989 года
тот же Crown WS 440 японского производства был отдан полякам по лицензии, 442ая модель рядом стоящая, для немцев под брендом MacWatts

The WS-442 stereo amplifier is part of the Unitra-Diora SSL-042.

Hi-Fi sets. It is equipped with indicators for signal sources, functions and output power on light emitting diodes (LEDs). It has the ability to connect 5 signal sources and a graphic equalizer. It can handle 4 columns simultaneously or in pairs A + B, A, B.

The WS-442 amplifier is the successor of the WS-418 and WS-432. There were several versions, the first with the red Unitra logo, export versions, such as McVoice, Crown Japan, and in the country, more with the Dior logo. It was produced in the following colors: black, silver and silver with black elements (keys and knobs).

Depending on the version, there were also different potentiometer knobs (round or cut at the edges, made of aluminum or plastic) and values above the control indicators (peak value). The successor of WS-442 is WS-4421.


Technical data / acc. service manual WS-442 from 1986:

Rated output power at Rload  R_obc=2x8 Ω: 2x35 W
Harmonic distortion at rated power: ≤0.2% at f = 1kHz
Maximum output power: 2x40W
Sensitivity of inputs:
- line input ≤200 mV
- correction input (phono) 2 mV ± 2 dB
Maximum input voltage:
- line input ≥2V
- correction input (phono) ≥20 mV
Recording output voltage:
- DIN 0.2 mV ± 2 dB socket
- CINCH 200 mV ± 2 dB socket
Input impedance
- 220 kΩ line input
- correction input (phono) 47 kΩ ± 20%
Headphone output voltage at R = 400 Ω: 5.0 V ± 2dB
Power transmission band: 35 ÷ 20,000 Hz
- line input (with a tolerance of ± 1.5 dB) 20 ÷ 20,000 Hz
- correction (with a tolerance of ± 2 dB) according to the RIAA curve
Signal to noise ratio
- 90 dBA line input
- 85 dBA correction input
Tone adjustment range for f = 100 Hz and f = 10 kHz: ≥10 dB
Crosstalk rejection for f = 1kHz: ≥45dB
Power supply: 220 V - 50 Hz
Permissible power consumption: 140 VA
Dimensions: 440x90x260 mm
Weight: 8 kg