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Anonymous Posted on Jan 21, 2010

Is it possible to obtain a replacement pre-amp board for a yamaha hs6 organ? there is a signal coming from the board which can passed through an external guitar amp, via the left or right speaker jacks, to give a reasonable volume.

  • Anonymous Jan 23, 2010

    You may be right! I can get a signal, from both speaker jacks and from the headphone socket, which I then can amplify using a 40W guitar amp. There is a loud background whine which can be reduced with the equaliser knobs on the guitar amp but not eliminated. Mike J

  • Michial Gueffroy May 11, 2010

    If the preamp board is passing signal to an external amplifier the problem you are having is further along in the circuit not in the preamp board. Maybe I don't understand well enough what your problem is or what you are trying to accomplish.

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Michial Gueffroy

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  • Posted on Jan 24, 2010
Michial Gueffroy
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Check all the capacitors one at a time for leakage.You might also have a transistor in the preamp stage which is starting to go bad. Whatever you do though don't use the speaker output jacks of the organ as line outs into the input jack of the guitar amp. In a properly working organ you could destroy the output transformer and the input stage of your amp because most speaker outs are A.C. voltage to drive the speakers not low level D.C. which is what your amp is used to. Let me know how you make out.

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One of Yamaha's new arranger keyboards, the PSR-S700 is the more entry-level model, but still comes with a range of impressive features:
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