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Hammond Organ L-100 Series Service Manual

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  • Page 2 Changes include: Original ca. 1961 Original service manual written by • Schematics recreated in Illustrator allowing support for Hammond Organ Company interactive comparisons between models and a 17MB November, 2018 Initial update by Michael reduction in file size Hightower •...

  • Page 3: Table Of Contents

    Table of Contents 3-3. Upper Manual Key ......24 3-4. Lower Manual Key ......24 3-5.
  • Page 4 7-3. Other Resources ......82 7-4. Revised RH End-Panel Layout Template ..82 7-5.
  • Page 5 L–100–2 organ. Wiring of the rhythm unit to the console is L–200 presented in Figure 5–9. The Model L–100 Hammond organ is a completely self-contained L-Series organs will have fuses added to the Canadian power console, requiring no external tone cabinet. It has two manuals supply (101–000130) to comply with C.S.A.

  • Page 7: How The Organ Operates

    SECTION I HOW THE ORGAN OPERATES 1–1 GENERAL on each playing key are controllable by means of drawbars. By suitable adjustment of these controls the player may vary the tone This section contains a description of the operating principles colors at will. Several pre-selected tones are also available by use of L–100 Series organs.

  • Page 8: Motor And Power Switch

    The pedal tones do not require drawbars for tone color variation, because they are produced as complex tones by special tone wheels. The single pedal drawbar adjusts the volume of the pedals relative to that of the manuals, and the pedal signal then is combined with the signal from the manuals before passing into the matching transformer.
  • Page 9 Figure 1–4: Block Diagram, L–100 Series Figure 1–5: Typical Tone Generator Page 9...
  • Page 10 Adjacent to each tone wheel is a magnetized rod with a pickup coil Wiring from the various filter assemblies leads to the terminal strip wound on it. These magnets extend through the front and back of on the long edge of the generator. the generator, and are held by set screws which can be loosened The output frequencies of the tone generator are numbered, for in case adjustment is ever necessary.

  • Page 11: Manuals

    Figure 1–7: Filter Locations and Frequency Terminations on Generator Cover 1–5 MANUALS as possible. In case a contact becomes dirty in spite of these precautions, a busbar shifter is provided in each manual to slide Musical frequencies from the tone generator go through the the busbars endwise and thus provide a fresh contact surface.
  • Page 12 The key contacts are connected through resistance wires to the 6th harmonic busbar, the blank spaces in this row have contacts manual terminal strips. The manual wiring chart, Figure 1–8, connected to ground through resistance wires. shows how the contacts of each key are connected to the proper The busbars of each manual, each one carrying a certain frequencies to supply the fundamental and harmonics of that harmonic, are wired to the appropriate harmonic drawbars for that...

  • Page 13: Harmonic Drawbars

    1–6 HARMONIC DRAWBARS transformer go to the preamplifier input. The matching transformer is localed within the preampli fier chassis. The left group of seven harmonic draw bars (Figure 1–9) is associated with the lower manual, and the right group of nine draw 1–7 PEDAL DRAWBAR bars controls the upper manual.

  • Page 14: Expression Pedal

    1–9 EXPRESSION PEDAL speaker. The VOLUME SOFT tab controls the overall volume of the organ and is especially useful where playing. The expression pedal, sometimes called “swell” pedal (Figure 1–1) is operated by the player’s right foot and varies the volume of 1–14 PERCUSSION CONTROL TABS both manuals and pedals together.

  • Page 15: L-100-1 Six-Voice Percussion Feature

    lower manual, and available when played in a legato fashion each 1–16 L–100–1 SIX-VOICE PERCUSSION FEATURE time a key is depressed. The “Cymbal” is available on the pedal and sounds each time a pedal is depressed. The “Cymbal-Brush” control turns these effects on and selects the “Cymbal-Brush” volume.

  • Page 16: External Equipment

    The BLOCK and CYMBAL voices are programmed into the pedal Insert the “Y” connector into the terminal, and insert cable keyboard when their rocker tabs are “on”. The remaining four previously removed into one arm of the “Y”. Connect the external voices are programmed into the lower manual keys when their sound source to the other arm.

  • Page 17: Theory Of Operation

    SECTION II THEORY OF OPERATION 2–1 GENERAL A single low frequency oscillator (V4) provides the rate for the vibrato system (approx. 6.8 CPS). With either the normal or This section contains circuit descriptions of the amplifier chassis, small vibrato tab in use, this oscillator impresses its signal on and the percussion attachments.

  • Page 18: Percussion Amplifier

    Therefore, under this condition most signal will emanate from line is grounded through the key contact and tone generator filter. the plate. (The reactors being virtually short circuited by the This virtually grounds the grid and plate or V11 (connected as a plate circuit series resistors) and phase shift will be maximum —...

  • Page 19: Reverberation And Power Amplifier

    With either or both 2ND and 3RD HAR MONIC tab down, the 2–7 L–100A PERCUSSION VOICING CIRCUITRY (See Figure 5–3) harmonic drawbar wires are connected to the green signal input wire of the percussion amplifier. Either or both signals are fed back 2–7–1 MODE SWITCH to their respective drawbars by resistors R410 and R411 which are...
  • Page 20 With the “Mode Switch” in the “Normal”, “Vibrato”, or “Delayed Two positions of the “Mode Switch”, “ Vibrato” and “Delayed Vibrato” position, the various pre-voiced percussions are routed Vibrato”, also affect the normal Hammond percussions when they to a percussion preamplifier comprising Q314 and Q313. These are in use (See Note 2–7–B above).

  • Page 21: L-100-1 Six-Voice Percussion Circuitry

    of C608. The other plate of C608 responds by driving excess Cymbal” effects, a small high frequency speaker is attached to the electrons off to ground through resistor R624. The resultant posi- main amplifier. It is located under the lower right hand end block on tive voltage is then fed through D203 to the base of Q323, the the organ.
  • Page 22 The 30VDC is also supplied to the voltage divider R106 & R105, Q105, turning on Q105 and allowing white noise to appear on and fed to the emitter follower Q101, the emitter output of which is collector of Q105, tuned by C115 and L101. This signal is then 5.5VDC.
  • Page 23 charged through R6. This charging time is long enough to delay the conduction of Q3 until after the first pulse; then Q3 conducts, cutting off Q4 before the second pulse can be passed. Effectively, each time a signal is applied to the input at T4, one pulse appears at the output terminal (T11), which connects to terminal F of voice generator board 124–000114.

  • Page 24: Disassembly

    SECTION III DISASSEMBLY 3–1 GENERAL 3–4 LOWER MANUAL KEY This section contains description of disassembly techniques To remove a lower manual key proceed according to the following. peculiar to L–100 Series organs. a. Remove four screws which secure metal cover on control panel assembly.

  • Page 25: Drawbar, Drawbar Knobs Or Drawbar Assembly

    a. Remove four screws which secure metal cover on control of assembly, while pressing with thumb to release pressure panel assembly. on contact. b. Push drawbar all the way in. g. To separate drawbar from contact spring, remove screw at back end of drawbar.

  • Page 26: Lower Manual

    assembly to base. Control panel and drawbar assembly can a. Remove generator power panel cover. be folded over and rest on top of amplifiers. b. Unsolder all wires on power panel except yellow and grey k. Replace control panel mounting screws. wires to motor and starting condenser.

  • Page 27: Swell Assembly

    keyboard replace two screws in back of console first, leaving 8. Replace Expression Control Housing. them loose until remaining screws are replaced.) NOTE 3–12–A 3–12 SWELL ASSEMBLY If swell assembly is replaced as directed, circuitry will conform to Figures 5-3 and 5-4. To remove swell assembly, perform steps a.

  • Page 28: Percussion Circuitry, L-100A

    a. Remove four screws which secure metal cover on control panel assembly. b. Replace bulb with No. 12 GE 6.3V .15A miniature 2-pin. c. To replace power switch, unsolder two black leads from generator power panel. d. Compress springs on sides of switch and push through front of control panel.

  • Page 29: Practical Service Suggestions

    SECTION IV PRACTICAL SERVICE SUGGESTIONS 4–1 GENERAL 4–3 EQUIPMENT REQUIRED a. VTVM, Commander 870 or equivalent. This section contains performance standards, adjustment procedures, and troubleshooting information. b. Oscilloscope, Tektronix 503 or equivalent. NOTE 4–1–A 4–4 PROCEDURE Before making any checks or adjustments involving amplifiers, test all a.

  • Page 30: Vibrato

    TRUMPET preset and then UPPER DRAWBARS preset. NOTE 4–4–3–A The musical quality should be identical. Later organs, Figures 5-2 through 5-4, are equipped with vibrato width potentiometer R131. Adjust if vibrato effect is too narrow or too 2. Clarinet. Set upper drawbars to 008080800. Press broad.
  • Page 31 oscilloscope’s VERTICAL INPUT to the disconnected brown RCA plug. b. Remove the black RCA cable from the BK (Black) RCA jack located on the vibrato phase shift amplifier. Insert into the BK RCA jack an adapter with two RCA jacks and one RCA plug. Reconnect the RCA cable (black) into one of the adapter RCA jacks and connect the oscilloscope’s EXT.

  • Page 32: L-100A Percussion Performance Check

    observe increased vibrato. Add VIBRATO CHORUS tab and depressed in all but reiteration modes. observe that vibrato effect becomes more pronounced. 4. Percussion voices of the selector switch are checked for harmonic content by comparison with lower manual 4–6 L–100A PERCUSSION PERFORMANCE CHECK registration.
  • Page 33 Result: Notice absence of vibrato effect g. Cymbal-Brush Switch Operation—OFF c. Mode Switch Operation (Vibrato Functions)—VIBRATO 1. Lower Manual: DRAWBARS depressed Cymbal-Brush switch: 1. Control Panel Tabs: Action: Play lower manual Selector switch: GUITAR Result: Lower manual function should be normal. Mode switch: VIBRATO Drawbar functions should be normal.

  • Page 34: L-100-1 Six-Voice Percussion Performance Check And Troubleshooting

    4–7 L–100–1 SIX-VOICE PERCUSSION PERFORMANCE 4–7–3 PROGRAMMED VOICE DOES NOT SPEAK CHECK AND TROUBLESHOOTING If any voice speaks when push button is pressed, but not from programmed source (manual or pedal, as applicable), check rocker 4–7–1 OUTPUT LEVEL ADJUSTMENTS switch and associated wiring. See paragraphs 4–7–6 No Voice The rhythm volume levels are set at the factory, and will normally Response From Pedals and 4–7–7 No Voice Response From require no adjustment.
  • Page 35 In most respects this is a conventional amplifier circuit, and manual-to-generator cable or the generator itself. the schematic diagrams, Figure 5–2 Interactive L-100 Series Schematic, will enable the technician to locate the problem. The output of any single frequency on the tone generator may be checked by pulling out any drawbar and connecting 4–7–11 KEY DOES NOT PLAY OR HARMONIC IS MISSING...
  • Page 36 finger to see if it is turning. Each wheel is located directly behind its magnet, shown in Figure 1–6. If the magnet coil is defective, the generator must be returned to the factory, as replacement of a coil necessitates dismantling the entire generator. It is possible, although unlikely, that the magnet may have become loose and moved so far from the wheel as to make the note inaudible.

  • Page 37: Diagrams

    SECTION V DIAGRAMS 5–1 GENERAL For example, to view the changes between the AO-41 and AO-47 Vibrato you would zoom in to the Vibrato region of the schematic. This section contains schematic diagrams to illustrate the text and Then, alternately enable/disable the AO-41 and AO-47 layers. provide information necessary to proper organ servicing.
  • Page 38 This page intentionally left blank Page 38...
  • Page 39 Amphenol connector • L–111 Serial #64145 and above on, “2nd Harmonic” percussion only, grey keying wire with black wire Orange • L–112 Serial #64644 and above disconnected  “Vibrato Normal” tablet on Yellow Figure 5–2: Interactive L-100 Series Schematic Page 39...
  • Page 40 Figure 5–3A: Parts Layout, L–100A Percussion Unit Figure 5–3: Schematic Diagram, L–100A Percussion Unit Page 40...
  • Page 41 Figure 5–4: Schematic Diagram, L–100–1 Six-Voice Percussion Figure 5–4A: Parts Layout, L–100–1 Six-Voice Percussion Page 41...
  • Page 42 Figure 5–4B: Schematic Diagram Six-Voice Percussion, Early 1970 Production Figure 5–4C: Board Layout Six-Voice Percussion, Early 1970 Production Page 42...
  • Page 43 Figure 5–5: Schematic Diagram, L–100–1 Percussion Power Supply Figure 5–6A: Parts Layout, Pedal Control Board Figure 5–6: Schematic, Pedal Control Board Page 43...
  • Page 44 Figure 5–7: Wiring Diagram, L–100 Organ Page 44...
  • Page 45 Figure 5–8: Wiring Diagram, L100-1 and L–100–2 Organs Page 45...
  • Page 46 Figure 5–9: Wiring Diagram, L–200 Organ Page 46...
  • Page 47 TO DRAWBAR TO REVERB BUSSES SW. AMPHENOL CONNECTOR PERC./ PERC./ VIBRATO PERC./ ON REVERB/POWER PREAMP PREAMP VIBRATO VIBRATO PREAMP AMPLIFIER C402 RED DOTTED BOX CONTAINS BOTTOM LUGS OF CONTROL SWITCHES VIEWED FROM TOP TO LOWER MANUAL DRAWBARS PERC./ PREAMP TO UPPER MANUAL DRAWBARS TO POWER...
  • Page 48 Figure 5–11: Wiring Diagram, Percussion Unit, L–100A Figure 5–12: Wiring Diagram, Six-Voice Percussion, L–100–1 Page 48...
  • Page 49 Figure 5–13: Parts Layout, AO–41 Vibrato Amplifier Page 49...
  • Page 50 Figure 5–14: Parts Layout, AO–47 (126–000023) Vibrato Amplifier Page 50...
  • Page 51 Figure 5–14A: Comparison Between AO–41 and AO–47 Vibrato Amplifiers Page 51...
  • Page 52 Figure 5–15: Parts Layout, AO–42 (117–000019) Percussion Amplifier Page 52...
  • Page 53 Figure 5–16: Parts Layout, AO–43 (126–000017) Power Amplifier Page 53...
  • Page 54 Figure 5–17: Power Amplifier Fuse Location (Canadian, 101–000130) Page 54...

  • Page 55: L-Series Parts List

    SECTION VI L-SERIES PARTS LIST 6–1 OVERVIEW This section contains a list of all parts used in the L-Series organs. 6–2 CHANGES FROM SOURCE DOCUMENT The source document contained a list of parts that were manually typeset. The revision has been loaded into an Excel spreadsheet. All data has been arranged and standardized.

  • Page 56: Assembly List

    6–3 ASSEMBLY LIST Below is a list of the Assemblies referenced in the Parts Lists. Assembly Name Part Description Revision Part # 120-000011 Control Panel Control Panel Assembly 008-024391 Preset Tabs - Lower Manual Preset Switch Assembly Lower Manual 008-034391 Preset Tabs - Lower Manual Preset Switch Assembly Lower Manual...
  • Page 57 Assembly Name Part Description Revision Part # Miscellaneous Miscellaneous Speakers Speakers 123-000021 Photocell Swell Pedal Swell Pedal Assembly 125-000050 Rhythm II & Extrusion Rhythm II & Extrusion Assembly Page 57...

  • Page 58: Parts List

    6–4 PARTS LIST Below is the comprehensive parts list for L-Series organs. Use the Assembly List to identify the locations of parts. Orig. Rev- Assembly Part Description Value /Unit Spec. Ref. Units Part # ision 061-027350 Control Panel Panel Assembly 041-025778 Control Panel Stop Switch Base...
  • Page 59 Orig. Rev- Assembly Part Description Value /Unit Spec. Ref. Units Part # ision 025-035571 Control Panel Stop Knob Early Production Only Ivory 025-035572 Control Panel Stop Knob Early Production Only Brown 012-027613 Control Panel Clamp Spring 007-022320 Control Panel Terminal Lug Console Output to 011-036624 Control Panel...
  • Page 60 Orig. Rev- Assembly Part Description Value /Unit Spec. Ref. Units Part # ision Preset Tabs - Upper 031-036484 Control Tab Clarinet Manual Preset Tabs - Upper 031-036485 Control Tab Full Organ Manual Preset Tabs - Upper 013-028002 Tubular Clip Manual Preset Tabs - Upper 020-037238 Shaft...
  • Page 61 Orig. Rev- Assembly Part Description Value /Unit Spec. Ref. Units Part # ision 999-000151 Vibrato Tabs Spring Washer 839-040214 Vibrato Tabs Flat Head Machine Screw 600-021291 Vibrato Tabs Resistor 2.2 MΩ R403 600-021351 Vibrato Tabs Resistor 3.9 MΩ R404 600-021411 Vibrato Tabs Resistor 6.8 MΩ...
  • Page 62 Orig. Rev- Assembly Part Description Value /Unit Spec. Ref. Units Part # ision Reverb, Volume, and 600-021371 Resistor 4.7 MΩ R408 Brilliance Tabs Reverb, Volume, and 425-010542 Capacitor Ceramic 0.0015 µF C402 Brilliance Tabs Reverb, Volume, and 401-020342 Capacitor 0.022 µF C401 Brilliance Tabs Reverb, Volume, and...
  • Page 63 Orig. Rev- Assembly Part Description Value /Unit Spec. Ref. Units Part # ision 112-000021 Generator & Motor Generator & Motor Assembly 120V 60Hz 112-000022 Generator & Motor Generator & Motor Assembly 120V 50Hz 112-000023 Generator & Motor Generator & Motor Assembly 220V 60Hz 112-000024...
  • Page 64 Orig. Rev- Assembly Part Description Value /Unit Spec. Ref. Units Part # ision 035-036095 Pedal Keyboard & Switch Pivot Bracket 063-036553 Pedal Keyboard & Switch Terminal Panel Assembly Long 045-024196 Pedal Keyboard & Switch Terminal Panel 030-033305 Pedal Keyboard & Switch Stationary Contact Assembly 012-033541 Pedal Keyboard &...
  • Page 65 Orig. Rev- Assembly Part Description Value /Unit Spec. Ref. Units Part # ision 676-000144 Preamplifier (AO–42) Potentiometer 30 KΩ R225 063-024414 Preamplifier (AO–42) Resistor & Capacitor Panel Assembly 006-024407 Preamplifier (AO–42) Terminal Board 600-040931 Preamplifier (AO–42) Resistor 68 KΩ R212, R229 600-020391 Preamplifier (AO–42) Resistor...
  • Page 66 Orig. Rev- Assembly Part Description Value /Unit Spec. Ref. Units Part # ision C201, C205, 407-010029 Preamplifier (AO–42) Capacitor 100 µF C207 425-010151 Preamplifier (AO–42) Capacitor 39 pF 500V C203 413-010042 Preamplifier (AO–42) Capacitor 0.0047 µF 100V C211 C208, C209, 413-010072 Preamplifier (AO–42) Capacitor...
  • Page 67 Orig. Rev- Assembly Part Description Value /Unit Spec. Ref. Units Part # ision 600-021031 Vibrato Amplifier (AO–47) Resistor 180 KΩ R102 600-021051 Vibrato Amplifier (AO–47) Resistor 220 KΩ R101 600-021091 Vibrato Amplifier (AO–47) Resistor 330 KΩ R135 R130, R125, 600-021131 Vibrato Amplifier (AO–47) Resistor 470 KΩ...
  • Page 68 Orig. Rev- Assembly Part Description Value /Unit Spec. Ref. Units Part # ision 406-010112 Vibrato Amplifier (AO–47) Capacitor 0.047 µF 100V C118 406-010182 Vibrato Amplifier (AO–47) Capacitor 0.02 µF 100V C114, C115 422-032012 Vibrato Amplifier (AO–47) Capacitor 0.02 µF 400V C113 422-032022 Vibrato Amplifier (AO–47)
  • Page 69 Orig. Rev- Assembly Part Description Value /Unit Spec. Ref. Units Part # ision 600-020491 Power Amplifier Resistor 1 KΩ R311, R312 600-020631 Power Amplifier Resistor 3.9 KΩ R337 600-020891 Power Amplifier Resistor 47 KΩ R313, R323 600-021131 Power Amplifier Resistor 470 KΩ...
  • Page 70 Orig. Rev- Assembly Part Description Value /Unit Spec. Ref. Units Part # ision R316, R317, 600-020971 Power Amplifier Resistor 100 KΩ R328, R329 600-021011 Power Amplifier Resistor 150 KΩ R320 600-021031 Power Amplifier Resistor 180 KΩ R304 600-021051 Power Amplifier Resistor 220 KΩ...
  • Page 71 Orig. Rev- Assembly Part Description Value /Unit Spec. Ref. Units Part # ision 600-020772 Six-Voice Percussion PCB Resistor 15 KΩ R106A 600-020771 Six-Voice Percussion PCB Resistor 15 KΩ R119, R122 600-020791 Six-Voice Percussion PCB Resistor 18 KΩ R107B R106, R106B, 600-020812 Six-Voice Percussion PCB Resistor...
  • Page 72 Orig. Rev- Assembly Part Description Value /Unit Spec. Ref. Units Part # ision 676-000011 Six-Voice Percussion PCB Potentiometer Trimmer 5 KΩ R134 676-000019 Six-Voice Percussion PCB Potentiometer Trimmer 50 KΩ R113, R126 676-000015 Six-Voice Percussion PCB Potentiometer Trimmer 20 KΩ R169 C110, C117, 405-340012...
  • Page 73 Orig. Rev- Assembly Part Description Value /Unit Spec. Ref. Units Part # ision Q102, Q105, 001-021135 Six-Voice Percussion PCB Transistor Q109, Q110 001-021172 Six-Voice Percussion PCB Transistor Q111, Q113 001-021211 Six-Voice Percussion PCB Transistor Noise Q101 D100, D100A, D100B, D100C, 001-026010 Six-Voice Percussion PCB Diode...
  • Page 74 Orig. Rev- Assembly Part Description Value /Unit Spec. Ref. Units Part # ision Six-Voice Percussion 030-041132 Contact Spring Switches Six-Voice Percussion 041-041133 Pivot Bracket Switches Six-Voice Percussion 042-041130 Felt Stop Switches Six-Voice Percussion 030-033690 Stop Post Switches Six-Voice Percussion 012-032408 Spring Switches Six-Voice Percussion...
  • Page 75 Orig. Rev- Assembly Part Description Value /Unit Spec. Ref. Units Part # ision 124-000022 Power Supply Printed Wiring Board Assembly 023-033482 Power Supply Printed Wiring Board & Pin Assembly D100, D101, 001-024051 Power Supply Diode D102, D103 001-021133 Power Supply Transistor Q100, Q101 001-021111...
  • Page 76 Orig. Rev- Assembly Part Description Value /Unit Spec. Ref. Units Part # ision 001-021133 Pedal Control Board Transistor Q2, Q4 001-021135 Pedal Control Board Transistor Q1, Q3 001-026030 Pedal Control Board Diode 110-000047 RHYTHM II Drawer Automatic Rhythm Assembly 120V 60Hz 127-000028 RHYTHM II Drawer...
  • Page 77 Orig. Rev- Assembly Part Description Value /Unit Spec. Ref. Units Part # ision 056-040228 Woodwork Rear Cover 152-000024 Woodwork Bench Assembly 111-000026 Woodwork Cabinet Assembly L-122-1 050-025470 Woodwork Case Assembly 050-036891 Woodwork Top Panel 050-025427 Woodwork Music Panel 052-036887 Woodwork Baffel &...
  • Page 78 Orig. Rev- Assembly Part Description Value /Unit Spec. Ref. Units Part # ision 052-036887 Woodwork Baffel & Grille Cloth 056-040228 Woodwork Rear Cover 152-000027 Woodwork Bench Assembly 003-025333 Miscellaneous Pedal Filter Choke Assembly 011-024352 Miscellaneous Cable Assembly Generator To Manuals 121-000002 Miscellaneous Reverberation Unit Assembly...
  • Page 79 Orig. Rev- Assembly Part Description Value /Unit Spec. Ref. Units Part # ision 040-030216 Photocell Swell Pedal Cell & Housing Wiring Assembly 016-030153 Photocell Swell Pedal Diffuser 025-032880 Photocell Swell Pedal Photo Cell Housing Cover 034-033419 Photocell Swell Pedal Light Bulb Socket Assy. 012-030154 Photocell Swell Pedal Spring...
  • Page 80 Orig. Rev- Assembly Part Description Value /Unit Spec. Ref. Units Part # ision 006-043833 Miscellaneous Terminal Strip Assembly Shelf 999-032998 Miscellaneous Generator Tee-Nut 043-024246 Miscellaneous Generator Grommet 999-000104 Miscellaneous Generator Washer 824-121114 Miscellaneous Generator Mounting Screw 013-031744 Miscellaneous Plastic Tie 015-025581 Miscellaneous Oil Tube Assembly...

  • Page 81: Modifications

    SECTION VII MODIFICATIONS 7–1 OVERVIEW Being one of the more inexpensive tonewheel Hammonds, the L–100 has rich aftermarket support for modifications and improvements. These range from simple modifications like connecting a Leslie to more complex changes like sculpting a more B3-like tone or adding unique tonal changes like overdrive.

  • Page 82: Other Resources

    d. Strip the ends of the red, green, and black wires so that the special connectors (in envelope) may be attached, i.e., clamped and soldered, as follows: • Red wire - male connector • Green wire - female connector • Black wire - female connector. e.
  • Page 83 7–4–1 PARTS LIST The following parts are used for the panel. If you choose to use different switches, then naturally the drill holes will need to be adjusted for their mounting dimensions. Part Value Quantity Digi-Key Part # 1568-1601-ND Knob Line Out 987-1716-ND Potentiometer...
  • Page 84 Ø 3.0 mm Ø 3.0 mm Ø 3.0 mm Ø 7.5 mm - ” Ø 7.5 mm - ” Ø 7.5 mm - ” 35 mm 35 mm 185.341 mm Figure 7–3: Modified RH End-Panel Template Page 84...
  • Page 85 Ø 3.0 mm Ø 3.0 mm Ø 3.0 mm Ø 7.5 mm - ” Ø 7.5 mm - ” Ø 7.5 mm - ” 35 mm 35 mm Chorus Depth Overdrive Gain Volume High Treble Boost Overdrive Line Out 185.341 mm Figure 7–4: Modified RH End-Panel Template, with Parts and Labels Page 85...

  • Page 86: Kon Zissis Chorus Depth Control

    7–5 KON ZISSIS CHORUS DEPTH CONTROL This modification improves the L100’s chorus tone and adds control over chorus depth. A 500K linear taper potentiometer can work as a Chorus Depth Control by mixing the straight signal with the vibrato signal. The 0.0047 μF capacitor wired across potentiometer pins 1 and 2 emphasizes the midrange and treble frequencies of the straight signal above those same frequencies in the vibrato signal.

  • Page 87: Kon Zissis Treble Boost Mod

    Remove the R223 100kΩ grounding resistor connected to C213 to fatten the percussion signal and the main organ signals. Short R222 (270kΩ) and R226 (180kΩ) to increase the volume level of the percussion signal so that it is better matched with the boosted main organ signals.

This manual is also suitable for:

L-100L-100aL-100-1L-100-2L-200

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