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  1. H

    Organ Farfisa 251S

    Hi Bertus, I cannot find a circuit for the (obsolete) SN29730 "Oscillator" so cannot comment on what's inside it. However, it must be a some sort of v.c.o because the pins 3 and 11 are taken to an array of precision resistors that transpose the organ's pitch in semi-tone intervals. On the...
  2. H

    Organ Farfisa 251S

    Hi Andre, I am in a similar situation - FARFISA CH-25 organ stopped working after playing for half an hour. I switched off and then on agains and to came back - for a little while. As time went on, the playing time grew shorter and shorter until it was impractical to ply it. I then bit the...
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