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Hammond rt2 organ tone generator

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    Hammond rt2 organ tone generator

    Is the tone generator in the rt2 the same as the one in the e112 or a100 and others?

    #2
    I just finished re capping the tone generator on the rt2 and how do i measure the output of each tone ?
    I used a digital multimeter set at ac but i hardly get any readings . What is going on ?

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      #3
      The normal voltages from the TG are pretty low, like six to ten milivolts (.006 volts) Handheld multimeters are not all alike and some do a poor job with signals this low and with frequencies that a TG produces. What meter do you have?
      Tom in Tulsa

      Fooling with: 1969 E100, 1955 M3, 1963 M100, Leslie 720

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      • baldwin 46c
        baldwin 46c commented
        Editing a comment
        hi ! i have a canadian tire brand multimeter made in china , it supposed to be auto ranging with ac and dc , when i set it on ac voltage i attach one lead to ground and the positive lead at each end of the coils on the tone generator , on some i get a reading of .002 volts and some no reading .
        this is after i have replaced all of the caps , i should be getting readings in the .006 range volt readings , should i not !

      #4
      Originally posted by baldwin 46c View Post
      Is the tone generator in the rt2 the same as the one in the e112 or a100 and others?
      Not the same as the E-100 series.

      Possibly the same as in your A-100, depending on the year of the RT-2. On the -2 series, the tone generator output terminals may or may not be in chromatic order depending on when it was made. If yours does not have them in chromatic order - then the A-100 generator will fit.
      Current organs: AV, BC, A-100
      Current Leslies: 22H, 142, 147, 760
      Organs in the past: L-100 (several), M-100 (x2), T-100, E-100, CV
      Other keyboards: Roland FP-4, Yamaha DX7, Yamaha TX81Z, Yamaha Motif ES Rack, Korg Krome, Novation Mininova

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        #5
        the reason i ask is that i was planning on taking the tone generator from an e112 and install it in the rt2 , reason is the the e112 has mylar caps that do not drift and the rt2 has old out of spec wax caps . the idea was to avoid re calibrating the tone generator if i replace the wax caps

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          #6
          A problem with the e100 unit will be that it does not have the lowest octave of wheels, tones 1-12. In the e100 these tones are provided by a divider in the pedal circutry. I've redone four tgs and three of the four sounded fine and didn't require adjustment, at least for my ears 8) I would bet lunch that your meter is just not sensitive and accurate enough to give you useful readings. How does the organ actually sound? I would expect a dramatic improvement (unless like on my BC some 'tech' had done "bad things" to the preamp)
          Tom in Tulsa

          Fooling with: 1969 E100, 1955 M3, 1963 M100, Leslie 720

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