Electronic Organ and Digital Piano Service
Electronic Organ and Digital Piano Service
General Description This is a shaded pole induction motor used for starting the generator. If your organ is having trouble starting you might suspect this motor. Be sure to eliminate other possibilities. A bad start switch A bad run switch. A sluggish generator. Mechanical Make sure the threads are in place going to each bearing. From […]
Hammond Generator Start Motor Read More »
General Description From Service Manual When the organ is started, the starting switch is turned on and held for about “8” seconds while the starting motor brings the system up to speed. The “run” switch is then turned on. This switch simultaneously connects the synchronous motor and introduces a resistor in series with the starting
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The Hammond Vibrato Hammond Organ consoles equipped with vibrato differ from tremulant models in the omission of the tremulant switch, tremulant control, and non-vibrato preamplifier, and in the addition of the vibrato line box, scanner, vibrato switch, and vibrato preamplifier. Three degrees of vibrato are available and also a different degree of chorus or celeste
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Scanner Operation From Service Manual Due to the fact that the Hammond Tone Generator runs at a precise pitch being synchronized to the 60 hertz, there is no way to create Vibrato at the tone source. Therefore, Hammond designed an “After Vibrato” system using a Scanner and a Delay Line. By introducing a phase shift in the Delay
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NOTICE: VERY HIGH VOLTAGE INSIDE!! Checking the Cathode Voltage for the 6550A Output Tubes Full 147 Schematic The first step in servicing the Leslie Amp is to check the Voltages at various points to determine the amp’s operating condition. There is one place I like to check first that gives you a fast indicator as
Servicing the Leslie 147 Amplifier Read More »
NOTICE: VERY HIGH VOLTAGE INSIDE!! Checking the Cathode Voltage for the 6550A Output Tubes Full 122 Schematic The first step in servicing the Leslie Amp is to check the Voltages at various points to determine the amp’s operating condition. There is one place I like to check first that gives you a fast
Servicing the Leslie 122 Amplifier Read More »
Remember to keep your motors clean and well oiled Servicing the Fast Motors There are two types of motors. The fast motor and the slow motor. The fast motors seem to need less maintenance than the slow motors because they are larger and better built. Also, the shaft doesn’t have to travel both around and
Servicing the Leslie Motors Read More »
“Fifty years of musical excellence.” from a 50th Anniversary Hammond Co. pamphlet The Hammond Organ story began in a loft over an Evanston grocery store, for it was there, even before an electric organ was contemplated, that the organization was born that was to become the founder and leading member of an industry. Today the
Here are the original 17 drawings from the 1934 Patent Office for the Hammond Organ from Laurens Hammond.
Hammond Patent Drawings Read More »
Here are the original Leslie Speaker drawings from the 1945 Patent Office.
Leslie Patent Drawings Read More »