sansui 250

The model 250 was developed in the mid-1960s as a successor to the model 500 and was more budget-friendly at the same time. He did not have a second AM tuner for multicast operation, because in those years it was already evident that this system lost to the MPX stereo. Apart from it, the 220 model was also produced, which was identical to the 250 model, but without the MPX decoder, and the magic eye was a single-section 6E5 tube. The design of the receiver was an aluminum front panel with plastic knobs finished with aluminum. The receiver abandoned the channel and mono / stereo switches, which showed a similarity to the 500A model. The Model 250 had several distinctive features: double magic eye 6GE12 - one section worked as an indicator of the FM signal level, and the other section as an indicator of the MPX signal, 6AQ8 / ECC85, 6BL8 / ECF80 tubes and two 6BN8 ECAA tubes, i.e. a triode with a double diode, were used in the MPX stereo decoder. It was probably the only stereo decoder with four vacuum tubes and the only one fully tube one. It has only two semiconductor diodes in the system, but MPX decoding is done on vacuum diodes, preamplifier based on 6AQ8 / ECC85 tubes, the receiver did not support 32-ohm speakers, RIAA phono preamplifier based on the 2SC-402 silicon transistor and one 12AX7 / ECC83 tube section. A similar solution was used by Sansui in its flagship amplifier AU-111. The power amplifier, as in budget designs, was based on ECL82 / 6BM8 tubes. Shields of power transformers were abandoned and transformers of lower power were used. The music power given by the manufacturer has dropped to 2 x 10 W.

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