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The first series was put into production in 1975, thus replacing the Meluzyna receivers. Mass production, on the other hand, began in 1977. Like Meluzyna, this set consisted of two segments: the TST-102 stereo tuner and the WST-102 amplifier. It fulfilled all the requirements of the DIN45500 standard of 1973 qualifying it as a Hi-Fi set. I used the tuner with the newer WS-442 amplifier, I never had the WST-102. I bought the receiver with the instructions (there was even a diagram) and the acceptance test protocol.
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