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  • Leslie 710 trek cross-over problems

    So I installed the trek LCO-1A crossover to my Leslie 710 per the instructions provided. When I power it up I get sound thru the 15” and the 6x9” speakers but not the tweeter. I using a dr. Fish sticks two Channel controller. I am under the impression that the main channel should work for my needs. Any input would be greatly appreciated! Thanks!

  • #2
    You should not get any sound through the two side mounted 6X9 speakers, which per the instructions are disconnected at the crossover network mounted on the front inside panel. You may have cut the wrong two wires at the crossover network. Carefully recheck the instructions and wiring at the crossover network assembly.

    I have several 710's with the TREK II LCO-1A installed.

    Joe

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    • #3
      Thanks Joe! I will take a look at everything again tonight. The instructions had me remove a capacitor that was wired in parallel with those speakers but didn’t say to disconnect them. I’m sure your right, that I probably wired something wrong since the signal going to the 6x9s belongs in the tweeter!

      Comment


      • #4
        The instructions had me cut wires between the power supply and the amps, not at the cross-over assembly. Am I missing something? I did remove the capacitor from the cross-over assembly. The Leslie manual I have doesn’t seem do have a complete schematic so I feel a little lost. Maybe Trekii can help me out, but i want to avoid calling them if I can. Any help would be appreciated.
        Thanks!!

        Comment


        • #5
          With some thought and maybe some mods to the kit, it should be possible to get the 710 and M111 to marry up even better.

          Organ sound - to rotary amp, Rotosonic and horn
          Bass - via the Trek crossover to the straight channel's 15"
          Reverb - to the straight channel, speaking through the two 6x9" speakers.

          Any thoughts from our experts on how that would be done?
          It's not what you play. It's not how you play. It's the fact that you're playing that counts.

          New website now live - www.andrew-gilbert.com

          Current instruments: Roland Atelier AT900 Platinum Edition, Yamaha Genos, Yamaha PSR-S970, Kawai K1m
          Retired Organs: Lots! Kawai SR6 x 2, Hammond L122, T402, T500 x 2, X5. Conn Martinique and 652. Gulbransen 2102 Pacemaker. Kimball Temptation.
          Retired Leslies, 147, 145 x 2, 760 x 2, 710, 415 x 2.
          Retired synths: Korg 700, Roland SH1000, Jen Superstringer, Kawai S100F, Kawai S100P, Kawai K1

          Comment


          • #6
            Originally posted by andyg View Post
            With some thought and maybe some mods to the kit, it should be possible to get the 710 and M111 to marry up even better.

            Organ sound - to rotary amp, Rotosonic and horn
            Bass - via the Trek crossover to the straight channel's 15"
            Reverb - to the straight channel, speaking through the two 6x9" speakers.

            Any thoughts from our experts on how that would be done?
            Well there's only two channels of amplifiers so to get reverb into the 6x9's would require external amplification.
            The speaker level reverb signal could be run into the 9-pin cable on the unused pin 3 and the newly unused pin 4 that was the stationary channel. Then wire the 6x9's to those pins in the Leslie.

            Geo

            Comment


            • #7
              Leslie 710 service info is here:

              http://captain-foldback.com/Leslie_s...matics/710.gif

              http://captain-foldback.com/Leslie_s...ie_manuals.htm

              If I recall corrctly, removing the capacitor is disconnecting the 6X9's.

              I am away from home today. Tomorrow I will pull my TREK II instructions and reply back.

              Joe

              Comment


              • #8
                Do you really need to disconnect the 6x9s? The stock situation is that there's a crossover after the stationary amp, splitting treble and bass to the 6x9s and 15" respectively. If you're only sending bass into the straight amp, there won't be much for the 6x9s to do except carry a few higher harmonics.

                Or does the TrekII crossover do away with the inbuilt crossover for some reason?

                When using the 710 in effective single channel mode on something like an A, B or C, then losing the 6x9s won't really make a ha'porth of difference as we say over here (that's a half-penny's worth), but on an A100, E100 or M100, where the reverb could be used, then use them! I like Geo's idea of routing the reverb straight to them. If you could mix that reverb signal in with the filtered off bass signal, even better, as you'd have a better balance.
                It's not what you play. It's not how you play. It's the fact that you're playing that counts.

                New website now live - www.andrew-gilbert.com

                Current instruments: Roland Atelier AT900 Platinum Edition, Yamaha Genos, Yamaha PSR-S970, Kawai K1m
                Retired Organs: Lots! Kawai SR6 x 2, Hammond L122, T402, T500 x 2, X5. Conn Martinique and 652. Gulbransen 2102 Pacemaker. Kimball Temptation.
                Retired Leslies, 147, 145 x 2, 760 x 2, 710, 415 x 2.
                Retired synths: Korg 700, Roland SH1000, Jen Superstringer, Kawai S100F, Kawai S100P, Kawai K1

                Comment


                • #9
                  Thanks for the schematic! Not sure how the 6x9s being connected would have any effect on the tweeter since they are driven by different amps. Just to clarify the input that I am wiring this Leslie to is a 1/4” dr. Fish sticks controller. I am getting little to no signal through the rotary amp. Now that I have the schematic I will try and take some voltage readings on the rotary amp. Thanks!

                  Comment


                  • #10
                    You can swap the input/output of the amps just to see if the amp is working. (you mentioned the main amp was working) The rotary amp is the one with the smaller output transformer. Make sure the volume adjust on the amp is turned up.

                    Joe

                    Comment


                    • #11
                      I have a 710 hooked up to a B2 .. Highs sound great Bass is Ok but i want a lil more thump, will the conversion kit make the Bass more full.. dont need it to be overpowering just want a lil more oomph.. Dont think i need a full Mod.. thoughts??

                      Comment


                      • #12
                        Yes! If you're sending the full range of the organ to the rotary channel of the 710, all you have at the bottom end is the 6x9" speaker in the Rotosonic drum and that isn't going to to give you much bass at all! The crossover kit, if correctly fitted, will send the extreme low end of the organ's audio signal to the 710's stationary channel, which has a 15" bass unit. The bass won't spin with the rest but it doesn't need to, as the rotary effect is less pronounced at low frequencies anyway.

                        If you're playing pedals, the kit is vital. If not, it's still a good idea.
                        It's not what you play. It's not how you play. It's the fact that you're playing that counts.

                        New website now live - www.andrew-gilbert.com

                        Current instruments: Roland Atelier AT900 Platinum Edition, Yamaha Genos, Yamaha PSR-S970, Kawai K1m
                        Retired Organs: Lots! Kawai SR6 x 2, Hammond L122, T402, T500 x 2, X5. Conn Martinique and 652. Gulbransen 2102 Pacemaker. Kimball Temptation.
                        Retired Leslies, 147, 145 x 2, 760 x 2, 710, 415 x 2.
                        Retired synths: Korg 700, Roland SH1000, Jen Superstringer, Kawai S100F, Kawai S100P, Kawai K1

                        Comment


                        • #13
                          Originally posted by andyg View Post
                          Yes! If you're sending the full range of the organ to the rotary channel of the 710, all you have at the bottom end is the 6x9" speaker in the Rotosonic drum and that isn't going to to give you much bass at all! The crossover kit, if correctly fitted, will send the extreme low end of the organ's audio signal to the 710's stationary channel, which has a 15" bass unit. The bass won't spin with the rest but it doesn't need to, as the rotary effect is less pronounced at low frequencies anyway.

                          If you're playing pedals, the kit is vital. If not, it's still a good idea.
                          Won’t pedal bass damage the root sonic 6x9 anyway?
                          Hammond C3, M102, XB3, XB5
                          Lowrey Heritage DSO-1, H25-3, Yamaha E70
                          Farfisa Compact Duo Mk2, Vox Continental 300, Korg BX3 Mk1, Leslie 122, 145
                          www.drawbardave.co.uk

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