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Thread: Allen System 603 thoughts

  1. #11
    f Forte rjsilva's Avatar
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    It turns out the organ in question may be a 705. I looked it up and it seems like its better than the 603, right? Im not sure why there is confusion about the model.

  2. #12
    Moderator jbird604's Avatar
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    705 is a very nice model. There was a thread some time ago about the purchase and installation of a 705. It's a MOS-2 model, thus incorporating a number of refinements over the MOS-1 603, though not the drastic changes that came with ADC technology.

    The 705 has the same "doubled computer" design as the 603, so every stop has "chorus," and celestes can be created in any tone color using the celeste tuning tab. In addition, the 705 has the interesting "mixture computer" setup that Allen used on just a handful of MOS-2 models -- 705, 1105, and possibly another larger or custom model.

    The 705 is a "six-channel" organ. It plays through four regular audio channels, driving HC-12 speakers, and these four channels all include great, swell, and pedal stops. Two additional channels reserved for mixtures play through their own two amplifiers and a pair of PP-3 speakers (or two PP speakers per channel).

    Because the mixtures get their own dedicated computer system, they can be more complex and more developed than the standard MOS mixtures, with variable breaks in the scale. When voicing, you have the ability to tailor the sound of the mixtures to your liking independent of the rest of the stops.

    The 705 of course includes all the niceties of a full-size MOS organ, such as a comprehensive double-memory capture system, card reader, deluxe "D" console. Expression is NOT divided though, since, as typical in MOS organs, all three divisions use all the computers and all the channels. No MIDI, since that was not available at the time. But MIDI can be very easily added using a quickly attachable interface that our own Admin's company sells.
    John
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    Church: Allen MDS-45 with Allen MIDI-DIVISION-II expander
    Home: Allen Renaissance R-230 with expanded four-channel audio and MIDI-DIVISION-II
    Shop: Bunch of organs in varying conditions, some good, some not...
    Half of an incredible two-man organ service team -- servicing all the major digitals in Arkansas churches
    https://www.facebook.com/pages/Birds...97551893588434

  3. #13
    f Forte rjsilva's Avatar
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    Thanks for the info jbird! Apparently this 705 (or 603) has what I'm assuming is an external amp rack which is disconnected. If I were to go see this organ it'd need to be reconnected. I'm sure I could figure out where things go with no problem, but it'd be nice to have an idea before going. Where would the connectors for the amp rack go in the organ? Is it pretty obvious?
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  4. #14
    Moderator jbird604's Avatar
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    Normally on large MOS organs there are coax cables carrying the audio channels to the rack, and these coax cables are hard-wired at the console end, or at least attached by lugs to screw terminals underneath a metal cover in the floor of the organ. So you'll probably find a coiled up bundle of coax inside the console, along with a control cable that also goes to the rack and serves to send a 12 volt turn-on signal to the power relay on the rack. There may be more than one wire in that control cable, such as antiphonal relay wires or possibly "delayed" 12 volts to operate remote mutes, if they are used on this particular organ.

    So you should only need to connect the ends of the coaxes to their corresonding amplifier inputs on the rack (they should be numbered for reference), then connect the control cable to its terminal strip on the rack (should be marked clearly or else color-coded). It isn't hard to do as long as the numbers or labels haven't been removed by accident.

    Be sure NOT to turn on the console until you locate the control cable and make sure that the +12 spade lug is NOT touching the ground lug or any other lug! I failed to do this once, and blew the fuse on the 12 volt power supply in the console.

    Best to make sure everything is hooked up before you plug in the AC power cords.

    If the speakers are unhooked from the amp rack, you'll need to connect them. All channels use HC-12 cabinets except the two mixture channels, which use one or two PP-3 speakers each. If there are relays on the rack, you can ignore them and just connect the speaker cables directly to the amplifier output terminals.
    John
    ----------
    Church: Allen MDS-45 with Allen MIDI-DIVISION-II expander
    Home: Allen Renaissance R-230 with expanded four-channel audio and MIDI-DIVISION-II
    Shop: Bunch of organs in varying conditions, some good, some not...
    Half of an incredible two-man organ service team -- servicing all the major digitals in Arkansas churches
    https://www.facebook.com/pages/Birds...97551893588434

  5. #15
    f Forte rjsilva's Avatar
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    Thanks jbird!

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