Mod THUNDERDRIVE (K-950) Instruction Manual Download Page 7

7

SECTION 2 – Mount Potentiometers and Footswitch 

1)  Mount the two 250K potentiometers in the 3/8" holes at the top of the enclosure using hardware 
provided.

Remove nut and flat washer from potentiometers and 
place large lock washers (S-HLW38) over shaft of each 
pot before inserting them through their mounting holes.  
Fasten nut over flat washer and tighten.

1

2

3

1

2

3

Before mounting, gently 

bend the pot lugs back so 

they are pointing straight 

up when mounted.

2)  Mount the DPDT footswitch in the ½” hole with its solder lugs oriented as in the drawing.

(The top hex nut and large plastic washer should be fastened on the outside of the box).

Please refer to DRAWING 3.

SECTION 3 – Mount and Connect Remaining Components 

1)  Connect the loose ends of the two diodes to output pot lug “1”.  

Do not solder.

2)  Connect one of the 0.1

µ

F capacitors to output pot lug “1” and terminal #5 of the terminal strip.  

Solder all connections at output pot lug “1” and terminal #5 now.

3)  Connect the other 0.1

µ

F capacitor to terminal #4 and to both lugs “2” and “3” of the distortion pot.  

Solder all connections at terminals #3, #4, #5 and distortion pot lugs “2” and “3” now.

4)  Locate the battery clip.  Cut 1 ½” length off the ends of each 
lead and discard (or save for other projects).  Connect the black 
lead to the “ring” lug of the input jack.  Connect the red lead to 
terminal #2 of the terminal strip.  Solder these connections now.

Please refer to DRAWING 4.

SECTION 4 – Wire Remaining Connections 

1)  Strip and tin a 1 ½” piece of wire connect footswitch lugs “3” and “6”.

2)  Strip and tin a 1" piece of wire and connect the input jack “tip” lug to the footswitch lug “2”.

3)  Strip and tin a 3 ½” piece of wire and connect footswitch lug “1” to distortion pot lug “1”.

4)  Strip and tin a 1 ¾” piece of wire and connect the output jack “ground” lug to 
output pot lug “3”.

GROUND LUG

TIP LUG

5)  Strip and tin a 1 ¼” piece of wire and connect the output jack “tip” lug to 
footswitch lug “5”.

6)  Strip and tin a 3 ½” piece of wire and connect the output pot lug “2” to footswitch lug “4”.

Finish it off by double-checking all of your connections, connect and insert a 9V battery (with insulation), screw 
the lid on and fasten the knobs to both pot shafts.

RING LUG

SLEEVE LUG

TIP LUG

Leave the area behind the footswitch free from obstruction because it will be a tight fit for the 9V battery back there.

Summary of Contents for THUNDERDRIVE (K-950)

Page 1: ...ooth distortion at maximum gain settings Adjusting output and distortion controls provides a wide variety of tones in spite of its simple construction It is capable of overdriving the preamp section o...

Page 2: ...pages They should be separated and used as a reference to help assemble the kit correctly 2 Visit www modkitsdiy com if you have any problems when first turning on your pedal for troubleshooting help...

Page 3: ...W SC 12B 1 Stranded Wire 22 AWG Blue S W22BL 3 FT PARTS LIST 1 3 RING LUG SLEEVE LUG TIP LUG GROUND LUG TIP LUG 250k Potentiometer Audio Taper R VBM 250KA SS 2 DPDT Foot Switch P H498 1 Terminal Strip...

Page 4: ...t red gold 4 7K 4 7k Resistor W R A4D7K 1 red black green gold 2M R A2M 1 2M Resistor W P QMPSA18 1 NPN BJT MPSA18 MPS A18 E B C 1N4148 HIGH SPEED SOLID STATE DIODE P Q971 2 104J S G312 Insulating Tol...

Page 5: ...e a good solder joint Take your time with each connection and make sure that all components are connected and will remain connected if your project is bumped or shaken Bend the component lead or wire...

Page 6: ...diode s cathode as well as the other diode s anode 4 Mount the 4 7K resistor to terminals 2 and 5 Do not solder 2 Strip and tin a 1 piece of wire and connect terminal 1 to 3 5 Mount the 2M resistor t...

Page 7: ...Solder all connections at terminals 3 4 5 and distortion pot lugs 2 and 3 now 4 Locate the battery clip Cut 1 length off the ends of each lead and discard or save for other projects Connect the black...

Page 8: ...DRAWING 1 TOP LEFT SIDE RIGHT SIDE 1 2 DRAWING 2 INPUT JACK OUTPUT JACK 1 5 INSIDE VIEW OF THE ENCLOSURE 1 8 3 8 3 8 MPS A18 4 7K 2M 8 B E C...

Page 9: ...1 2 3 INPUT JACK OUTPUT JACK MPS A18 4 7K 2M DRAWING 4 OUTPUT POT 1 0 4 J DISTORTION POT 104J BLK RED 2 3 1 6 5 4 9 1 1 Place the insulating tolex between the battery and footswitch lugs 3 and 6 to pr...

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