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  • To modify or not to modify,this is my question



    I can't believe my post from 2008 is still here and that was 4 computers and three residences ago,but I still have that M3 and plan to get it running this winter.Thank you to those who gave a reply.</P>


    Now my question;</P>


    I recently aquired an H-112 with a Leslie 610. I wish to modify the Leslie upper rotor to a more familiar configuration,meaning I wish to replace the existing rotor with the plastic horn and driver. Would this be considered "abuse of an ancient monument" or "making something out of nothing" which I'm usually pretty good (lucky) at. I would also replace the amp and crossover and use the new incarnation along with my 251as part ofmy "gig rig"</P>


    Thank you in advance,Raoul</P>

  • #2
    Re: To modify or not to modify,this is my question



    I'm sure you reaslie that it's not quite as simple as that, Raoul. If not, do some searches about leslie 610 and similar cabs like the 10x and 20x series. We've discussed them quite a lot. </p>

    On an H, I personally think the 610 is pretty awful, and I'd support any attempts to improve things, so no-one, I'm sure, would consider this 'abuse'. It is a lot of work, however. You'd need to common the outputs from the H and feed them into the 610. Bass frequencies would go to the 15". Mids go to the lower Rotosonic (which is only a 1-speed unit, remember) and highs to your new driver and treble horn rotor. Perhaps reverb from the H could be channeled separately to the 610's 6x9" speakers? You're effectively making it into a ''710RV'. It's do-able, I'm sure, and would no doubt sound better than it does now.
    </p>

    Andy
    </p>
    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

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    • #3
      Re: To modify or not to modify,this is my question

      OK we are off and running,I mean spinning.Here it my vision...I am going to change the upper rotor to the plastic horn and driver type,and convert the lower rotor to the more familiar affair and move the 15'' to the top of the rotor,by adding a new baffle board with the hole in the right spot. I have a 3-speed motor to use on the lower rotor,and plan to eliminate the 610's crossover,buthope to use the relays within it to change speeds.Therefore,my question at this point is;will the slow/fast relay be sufficent to operate both sets of motors?[&lt;b&gt;edited by:&lt;/b&gt; raoul at 10:00 PM (GMT -7) on Fri, Sep 25 2009]
      oops......and use either the upper and pedal channels to power the two drivers,or just the pedal channel due to its larger output transformer.I would also remove the driver tubes,and likely the power tubes from the channels I wont be using to lighten the load on the power trans.

      Comment


      • #4
        Re: To modify or not to modify,this is my question

        Here is my latest installment on the 610 conversion: I have both the drum and horn mounted and spinning,albeit still a bit out of balance.I am using the relay within the crossover and so far the lower has only the fast speed as well as off,but the larger problems at the moment are first,how do I combine or parallel the outputs of the H112,and second,now that the two speed upper motor is mounted as a hanging unit the slow motor runs but the shaft does not surge up to contact the tire.Will I be going back to that motor being in with the horn,or am I missing something else here?

        Comment


        • #5
          Re: To modify or not to modify,this is my question



          The spring.</p>

          Check out captain-foldback's site and download one of the leslie manuals. Some of them have exploded diagrams of the upper assembly and of the lower assembly showing where the springs need to go.</p>

          They upper vs lower springs are of a slightly different size I think, you might have to do a littel bit of stretching to get the spring right.</p>

          Or else you can buy 'em from Tonewheel-General for $3</p>

          Cheers!</p>

          -B</p>

          </p>
          -1958 Hofner 550 archtop guitar -1959 C3 and PR40- -1964 Busillachio Harmonium- -1964 M101-
          -1967ish Leslie 122- -1975 T500 (modded..chopped, and reassembled!)-
          -DIY 760 FrankenLeslie/rat hideout-
          -1980 Electrokey Electric Piano- -Yamaha electric Harmonium (early 80's?)-
          -1990 Jansen GMF150 amp- -1992 Korg 01W/fd- -1992 G&L S-500 geetar.

          Comment


          • #6
            Re: To modify or not to modify,this is my question

            Thanks Brendon,I'm on it ! Anyone able to say how to make the two outputs combine from the H 112?

            Comment


            • #7
              Re: To modify or not to modify,this is my question

              I now have one of the motor stacks apart and its not as simple as putting the spring on the other side of the slow motor because its too long.Would it be ill advised to cut the spring?

              Comment


              • #8
                Converting a 610



                Can the outputs of the H-112 be combined into one channel? I am looking at replacing the 4 channel amp in the 610 with a single channel tube unit.</P>

                Comment


                • #9
                  Re: To modify or not to modify,this is my question



                  [quote user="raoul"]I now have one of the motor stacks apart and its not as simple as putting the spring on the other side of the slow motor because its too long.Would it be ill advised to cut the spring?[/quote]</p>

                  </p>

                  Hmm... I can't give advice on this one.</p>

                  A couple of the lads on the forum here have answers for this, the trick is to either find their past posts or get their attention now.</p>

                  How about posting a quick side thread asking about adjusting springs on leslie motors... then coming back here for the rest of your project once that one's answered?</p>

                  -B</p>
                  -1958 Hofner 550 archtop guitar -1959 C3 and PR40- -1964 Busillachio Harmonium- -1964 M101-
                  -1967ish Leslie 122- -1975 T500 (modded..chopped, and reassembled!)-
                  -DIY 760 FrankenLeslie/rat hideout-
                  -1980 Electrokey Electric Piano- -Yamaha electric Harmonium (early 80's?)-
                  -1990 Jansen GMF150 amp- -1992 Korg 01W/fd- -1992 G&L S-500 geetar.

                  Comment


                  • #10
                    Re: To modify or not to modify,this is my question

                    Being the patient soul that I am, ;) I did cut one of the springs,and after many dis/reassemblies,and a few more cuts,I actually have it ! The other stack was much easier now that I'm ''experienced'' and all. Therefore,up to the minute I now have slow and fast spin. Tomorrow I'll attempt the audio portion.

                    Comment


                    • #11
                      Re: To modify or not to modify,this is my question



                      There you go!</p>

                      You're now qualified to advise newbies about their leslie motor springs!!</p>

                      Don'tcha love that?</p>

                      Not many of us are actually techs, but the risks we take on our own instruments give us experience to impart to the next guy.</p>

                      Cheers!</p>

                      -Brendoon</p>
                      -1958 Hofner 550 archtop guitar -1959 C3 and PR40- -1964 Busillachio Harmonium- -1964 M101-
                      -1967ish Leslie 122- -1975 T500 (modded..chopped, and reassembled!)-
                      -DIY 760 FrankenLeslie/rat hideout-
                      -1980 Electrokey Electric Piano- -Yamaha electric Harmonium (early 80's?)-
                      -1990 Jansen GMF150 amp- -1992 Korg 01W/fd- -1992 G&L S-500 geetar.

                      Comment


                      • #12
                        Re: To modify or not to modify,this is my question

                        The saga continues: At this point I am trying toget any cleanoutput from the H-112 intoany single channel of the 610 Leslie amp and all I get is distortion,and quiet distortion at that. The Leslie connector in the organ is model 059577. I tried a power amp and still weak and distorted signal. I continuity checked the Leslie cable,its ok. The console sounds big and beautiful on its own,but I hope to interface it with the converted 610. I sprayed the console/cabinet switch but no change. Could the problem lie in the Leslie connector?

                        Comment


                        • #13
                          Re: To modify or not to modify,this is my question

                          ......also......am I posting correctly,or should each seemingly unrelated question be under seperate title? Brendon? Anyone?

                          Comment


                          • #14
                            Re: To modify or not to modify,this is my question



                            You choose how to play!</p>

                            If its a new idea, can be handy to post a new thread, however, if you have a captive set of advisors and a running conversation it's best to keep going while the iron is hot. However, it helps to have the organ type and leslie type in the heading for this latest question, this'll grab the attention of those in the particular know.</p>

                            A lot of folks aren't interested in "modding" as such, but are willing to help out with a leslie hookup problem. They probably won't give the title a second look, know what I mean?</p>

                            Cheers old bean!</p>

                            -Brendoon</p>
                            -1958 Hofner 550 archtop guitar -1959 C3 and PR40- -1964 Busillachio Harmonium- -1964 M101-
                            -1967ish Leslie 122- -1975 T500 (modded..chopped, and reassembled!)-
                            -DIY 760 FrankenLeslie/rat hideout-
                            -1980 Electrokey Electric Piano- -Yamaha electric Harmonium (early 80's?)-
                            -1990 Jansen GMF150 amp- -1992 Korg 01W/fd- -1992 G&L S-500 geetar.

                            Comment


                            • #15
                              Re: To modify or not to modify,this is my question

                              Many Thanks Brendon,you are the man !

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