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INSTALLATION AND MAINTENANCE

The organ must be connected to a regulated-frequency source of the voltage and frequency 
specified on the name plate. If the frequency is not regulated, the pitch of the organ will be 
irregular.

When a console is set up for operation, the anchoring must be loosened so that the generator will 
float freely on its spring suspension system. No damage will result if this is not done, but the 
console will sound noisy, and the same is true if the anchoring is loosened but the console is not 
level. If the console is to be moved a long distance the anchoring should be tightened during such 
moves.

Instructions for loosening and tightening the generator in the console are given on the instruction 
card contained in the bench.

The tone generator is lubricated by putting oil into cups inside the console. Add oil in accordance 
with the instruction within the console.

When placement of console has been completed after loosening of generator, as described above,
the reverberation unit if necklace type should be unlocked by moving its lever "up". The unit should
be again locked whenever the console is moved, even if only a few feet. Consoles, serial number 
above 6127 do not require any locking or unlocking operation.

To replace the pilot lamp, remove the back cover, if the console has one. It is a pin type lamp, 6.3 
volts, #12.

                                                                                                                        

 

                                                                                                                         

 

 

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tuttotastiere.com

Summary of Contents for A-100 Series

Page 1: ...the resulting variations in the magnetic field induce a voltage in a coil wound on the magnet This small voltage when suitably filtered produces one note of the musical scale its pitch or frequency d...

Page 2: ...er is depressed The exception to this is the cancel key at the extreme left which serves only to release any key which may be locked down Only one preset key is used at one time If by mistake two are...

Page 3: ...own as tone 34 630 5210 After a tone is so logged it may be made available again by setting the harmonic drawbars to that number HARMONIC DRAWBARS FOR THE PEDALS In the pedals the harmonic resources h...

Page 4: ...le the rotary switch Figure 5 selects the degree of vibrato or vibrato chorus effect The Great tablet controls the vibrato for the pedals as well as for the Great manual PERCUSSION The Touch Response...

Page 5: ...the amplifier is applied to the driver unit in the reverberation device which then converts the electrical signal into mechanical energy This energy is transmitted through springs to a pickup unit wh...

Page 6: ...should be tightened during such moves Instructions for loosening and tightening the generator in the console are given on the instruction card contained in the bench The tone generator is lubricated...

Page 7: ...held for about 8 seconds while the starting motor brings the system up to slightly greater than synchronous speed The run switch is then turned on This switch simultaneously connects the synchronous m...

Page 8: ...tion with the speed at which the tone wheel is revolving determines the frequency of the tone generated Each driving gear with its two bakelite gears and four tone wheels runs in a separate compartmen...

Page 9: ...es this rod it causes a change in the magnetic field which induces a small voltage in the coil the frequency being determined by the number of teeth and the wheel speed Small coils are used on the hig...

Page 10: ...s seldom need adjustment and that setting them without proper equipment involves danger of damaging both magnet and wheel Therefore it is not recommended that the service man attempt this adjustment G...

Page 11: ...y This frequency numbering is continued throughout the instrument The frequencies are not in order on the terminal strip and Figure 13 indicates the arrangement Several terminals at the right end are...

Page 12: ...l bronze contact springs with precious metal points See Figure 15 When a key is pressed these points make contact with nine busbars extending the entire length of the manual The busbars also have prec...

Page 13: ...ine busses which are connected to taps on the matching transformer These correspond to different intensities of sound as shown by numbers on the drawbars The two left groups of drawbars are associated...

Page 14: ...The busbar shifter for each manual is a slotted stud near the right end of the manual as viewed from the back of the console see rear view of console Figure 8 for location If any note becomes scratch...

Page 15: ...card inside This card is reproduced below Figure 17 OPERATION OF MECHANISM ON PRESET KEYS In their basic construction the preset keys are identical to the playing keys Each has a plastic key mounted o...

Page 16: ...mined that a new return spring is necessary on either manual remove the console top and music rack and take the bolts holding the manual assembly out from the bottom of the console Raise the upper man...

Page 17: ...63 67 70 75 28 D 28 47 40 52 59 64 68 71 76 29 E 29 48 41 53 60 65 69 72 77 30 F 30 49 42 54 61 66 70 73 78 31 F 31 50 43 55 62 67 71 74 79 32 G 32 51 44 56 63 68 72 75 80 33 G 33 52 45 57 64 69 73 7...

Page 18: ...rings are connected to terminals by resistance wires similar to those used in the manual assembly and a cable connects these terminals to the proper terminals on the generator terminal strip Four colo...

Page 19: ...C 20 32 39 44 48 51 9 G 9 NC 21 33 40 45 49 52 10 A 10 NC 22 34 41 46 50 53 11 A 11 NC 23 35 42 47 51 54 12 B 12 NC 24 36 43 48 52 55 13 C 13 32 25 37 44 49 53 56 14 C 14 33 26 38 45 50 54 57 15 D 15...

Page 20: ...left end as you look in at the back It should be adjusted as described under Manual Busbar Shifters on a previous page Pedal Keyboard Pedal keys are set at the factory for average tension but are adju...

Page 21: ...e will be a frequency change of 10 cycles For the widest vibrato the whole line is scanned from beginning to end in about 1 14 second and this rate of change of phase causes about 1 1 2 decrease in fr...

Page 22: ...s mesh with the stationary ones In figure 28B two sets of plates have been removed to show the rotor Signals coming from the line through the vibrato switch appear on the stationary plates and are pic...

Page 23: ...s the signal that was borrowed from the 2nd or 3rd harmonic drawbar for the percussion amplifier is replaced When a key is depressed the signal first sounds loudly through the control tube transformer...

Page 24: ...ion output transformer reducing the percussion signal and also shorts out upper manual matching transformer compensating resistor R1 thus restoring the upper manual signal strength to provide proper b...

Page 25: ...quipped with a standard phonograph input jack The input impedance is approximately 1 megohm and the circuit requires a maximum input signal of about 1 2 volt A volume control will have to be installed...

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