14
Obtaining Tonewheel Organ Measurements.
NOTE: THIS IS A COMPLICATED PROCESS. USERS WITH NO EXPERIENCE WITH
ELECTRONICS OR ELECTRONIC MEASUREMENT EQUIPMENT SHOULD NOT ATTEMPT
THIS!
Required tools: Calibrated Digital Oscilloscope (Experienced users may use an analog
oscilloscope).
1. Locate the terminal strip on the backside of the tonewheel organ generator.
2. Connect the ground lead of the oscilloscope to a ground point on the organ (any metal
part of the generator is connected to ground).
3. Use the probe of the oscilloscope to measure the output of the individual tonewheels.
Most oscilloscopes have a cursor function which enables users to make fine adjustments
with less effort. Once the waveform (usually a sinusoidal waveform from tonewheels n.13
to n.91) is completely visible in the screen, set cursor 1 on the top peak of the waveform
and cursor 2 on the bottom peak. The oscilloscope should automatically provide the
correct reading in milliVolts. Please note that the first 12 tonewheels give an amplitude of
about 60~70 mVpp, while the remaining tonewheels vary from 30 to 10 mVpp. Measuring
each tonewheel could take up to an hour. Please note that the tonewheels are not
arranged in the organ from 1 to 91. They are organized in rows. The cart at the end of this
addendum shows what toneheels correspond to each connection in the four rows in the
organ.
4. Enter the values in the spreadsheet at the end of this manual.
First connection row:
85 42 30 78 66 18 6 54 90 35 83 71 23 11 59 47 40 28 76 64 16 4 52 88
Second connection row:
33 81 69 21 9 57 45 38 26 74 62 14 2 50 86 43 31 79 67 19 7 55 91 36
Third connection row:
84 72 24 12 60 48 41 29 77 65 17 5 53 89 34 82 70 22 10 59 46 39 27 75
Fourth connection row:
63 15 3 51 89 32 80 68 20 8 56 44 37 25 73 61 13 1 49 ground
“Pedal to Lower” button can activate the function for having pedalboard sound in the first
two octaves of lower manual: PLEASE ONLY USE DEDICATED FUNCTION IN THE
ORGAN PANEL AS DESCRIBED ON PAGE 10 AND 11 OF THIS MANUAL.
“Complex wheels” function can activate the so-called function that can add details and
harmonics to organ sound on lower tones and pedalboard tones.
“Foldback on 16’ ” function can activate the so-called function that will add foldback on
organ sound.
“Output mode”: it is used for select type of audio output.
1) Stereo out
2) Stereo out without cabinet ambient simulation
3) L = bass, R= horn with internal crossover set on 800 Hz: VERTICAL SIMULATION.
“Overdrive” : two selections possible, two different simulation of overdrive.
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