Ebay Classic organs

Collapse

Announcement

Collapse
No announcement yet.

percussion question

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • percussion question

    For all you experts. Is the percussion switch assembly phsically different on b3/c3 organs than on m3s? I wanted to cut out an opening in the drawbar trim panel of the c2g and install a m3 switch assembly, but room is too tight. Just wondering if there were two different assemblies.

  • #2
    The switch boxes are the same. You need to take a closer look at the different Hammond models. When Hammond came out with the C3, they had to relocate the Start/Run switches into the music rack woodwork to make room for the percussion switches.

    So, no, trying to install 3-series switches in a 2-series organ is kind of a no-go since the metal drawbar base is already punched-out for the Start/Run switches. I guess there's some way to patch it all in if you don't mind it looking amateurish, assuming you're not someone with access to a laser CNC machine or something like that. Doing it by hand will make a mess. And then you've got to relocate the Start/Run switches.

    This is why Trek II's percussion controls replace one of the cheekblocks.
    I'm David. 'Dave' is someone else's name.

    Comment


    • #3
      The only difference between the switch assemblies is the length of the cables. The main problem, like David says, is that the -2 series drawbar base already has holes in the wrong places.
      Current organs: AV, M-3, A-100
      Current Leslies: 22H, 122, 770

      Comment


      • #4
        Physical layout issues aside, there's also a toggle switch mounted underneath the B natural preset key on the upper manua.
        EDIT: I originally posted that this switch toggles between the percussion keying busbar (1') being sent to the percussion circuit, or not, but now I think that this switch is actually used for percussion volume.

        Interestingly, the current version of the Trek II percussion unit lacks an on/off toggle switch, meaning when you use the upper B natural preset, the harmonic wired up for percussion keying is always muted, even if percussion faders are at zero. This is a well known limitation and easy to get around by adding a toggle switch if you so choose, at the expense of having to throw a separate toggle switch to enable percussion later. So, if you transplant a percussion switch assembly and AO-28 preamp properly, you should have the percussion on/off properly enable / disable the 1' keying busbar.
        Last edited by muckelroy; 04-13-2022, 12:38 PM.

        Comment


        • Sweet Pete
          Sweet Pete commented
          Editing a comment
          This 1999 TP2-B is the current version.

      • #5
        Originally posted by muckelroy View Post
        Physical layout issues aside, there's also a toggle switch mounted underneath the B natural preset key on the upper manua.
        EDIT: I originally posted that this switch toggles between the percussion keying busbar (1') being sent to the percussion circuit, or not, but now I think that this switch is actually used for percussion volume.

        Interestingly, the current version of the Trek II percussion unit lacks an on/off toggle switch, meaning when you use the upper B natural preset, the harmonic wired up for percussion keying is always muted, even if percussion faders are at zero. This is a well known limitation and easy to get around by adding a toggle switch if you so choose, at the expense of having to throw a separate toggle switch to enable percussion later. So, if you transplant a percussion switch assembly and AO-28 preamp properly, you should have the percussion on/off properly enable / disable the 1' keying busbar.
        When the B natural is up, the switch grounds the wire. When it is depressed the ground connection is broken. It's a non latching momentary type switch.
        Hammond B3, XB3, XB5, M102 White Factory Split x2,
        Leslie145 x2, 251, 910, 760, 415,
        Farfisa Compact Duo, Vox Continental 301,
        Lowrey Heritage Deluxe DSO-1,
        drawbardave.co.uk

        Comment


        • Sweet Pete
          Sweet Pete commented
          Editing a comment
          When engaged below upper B preset supplies the R1 volume drop of drawbar/perc 'ratio'. I 'short out' R1 on mine so it is not needed.
          When volume 'normal' is used instead of 'soft' I prefer NO volume drop on my drawbars thanks.

      • #6
        The switch under the B preset key only regulates a feature that most people dislike and many disconnect - the upper manual volume drop on percussion "normal". If you don't consider that function a must, then no need to bother with that switch.
        Current organs: AV, M-3, A-100
        Current Leslies: 22H, 122, 770

        Comment


        • muckelroy
          muckelroy commented
          Editing a comment
          M3 doesn't need the extra 'switch under the B preset' because it has no presets. Main signal is dropped in volume via R1 inside the matching transformer when percussion is turned on. You can bypass R1 if you want, just like on consoles.

        • enor
          enor commented
          Editing a comment
          RLangham: Out of all the spinets, only the M-3 has this function.

        • RLangham
          RLangham commented
          Editing a comment
          Is there a tutorial for that on here? I know a lot of common spinet mods have a ton of information on the forum...

      • #7
        Easier to locate/purchase a correct -3 drawbar base than butcher a -2 base.
        Someone on the Hammond Tech FB group was 'punching' these out CNC and had them for sale to make use of 'M3' switches.
        A lot easier to rework the wood music rack for run/start switches.
        Would still have to punch out the hole for the switch pictured, below upper manual B preset.
        Don't really need the switch though,will work without the 'volume drop' (R1 bypass) just fine.
        This B2 has the TrekII TP-2B cheekblock mounted percussion unit.Trouble free operation since 1999.
        At first I didn't like the 'faders' type controls,grew to really like them.The 'plunk' is actually woodier than a stock AO28 circuit to my ears.
        Easiest path is the Trek,if you insist on 'stock ergonomics' that look correct,get the -3 base and the switch,be prepared to 'plumb' the switch and music rack.
        You may only view thumbnails in this gallery. This gallery has 1 photos.
        A100/251 A100/147 A102/222 B2/142 BV/147 BCV/145 M3/145 M102/145 M111/770 L101/760 T222/HL722 M111/770 no B3/C3!

        Comment

        Working...
        X