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m102 & Leslie 145 kit problem

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  • m102 & Leslie 145 kit problem



    Hi,I have a couple of questions:</p>

    1. I have a Hammond M102 and Leslie 145. The connection kit originally came off a T series Hammond, but seems to work ok. However, over time the preamp in the M102 has developed quite a loud mains hum that has been minimized by added capacitors across the high voltage terminals in the preamp. My question is...have I damaged my AO-29 preamp by using the wrong kit or maybe by not selecting the right ohm setting on the Leslie amp. What ohm setting should I use?...Open, 8ohm or 16ohm?</p>

    2. With the setup as described in question 1, I have a poor bass sound through the 15" speaker...as the notes approach bottom F the bass drops away noticeably. It is much less noticeable through the internal speakers, but very obvious when going through the Leslie. Again, is this down to the wrong kit or ohm setting...open, 8 or 16 seems to make no difference other than overall volume.</p>

    Thanks.</p>

  • #2
    Re: m102 &amp; Leslie 145 kit problem

    which impedance setting have you been using?

    Comment


    • #3
      Re: m102 &amp; Leslie 145 kit problem

      I've used all 3 settings, open, 8 and 16, but mainly open

      Comment


      • #4
        Re: m102 &amp; Leslie 145 kit problem

        [quote user="soulof66"]

        Hi,I have a couple of questions:</p>

        1. I have a Hammond M102 and Leslie 145. The connection kit originally came off a T series Hammond, but seems to work ok. However, over time the preamp in the M102 has developed quite a loud mains hum that has been minimized by added capacitors across the high voltage terminals in the preamp. My question is...have I damaged my AO-29 preamp by using the wrong kit or maybe by not selecting the right ohm setting on the Leslie amp. What ohm setting should I use?...Open, 8ohm or 16ohm?</p>

        2. With the setup as described in question 1, I have a poor bass sound through the 15" speaker...as the notes approach bottom F the bass drops away noticeably. It is much less noticeable through the internal speakers, but very obvious when going through the Leslie. Again, is this down to the wrong kit or ohm setting...open, 8 or 16 seems to make no difference other than overall volume.</p>

        Thanks.</p>

        [/quote]</p>

        Using the wrong ohm setting, such as open, can damage the organ's output transformer. Tube output transformers require a load to be attached at all times. When you switch off the internal speakers and play through the Leslie, the ohm switch in the Leslie is there to provide a load to the organ output transformer. Should be set to 8 ohms.</p>

        That said, if the bass does not fall off in the organ, but only in the Leslie, there is a problem either with the kit and/or how it's connected, or the Leslie itself. The Leslie should have much more bass than the organ.</p>

        George
        </p>

        </p>

        Comment


        • #5
          Re: m102 &amp; Leslie 145 kit problem



          Do not use OPEN! 8ohm should be good. If you get bass through the internal speakers then i'd be suspicious about the leslie.</p>

          As for the hum, i'm not sure whats going there. I have never run an amp with no load, so I dont know what the symptoms would be.</p>

          Comment

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