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MOD 102 GUITAR AMP KIT (K-MOD102-F)
ON
OFF
Use these instructions to learn:
How to build a tube amp.
This tube guitar amplifier circuit is based on a classic American circuit design combined with a British style
class A output section. At low volume it produces a clean chimey tone that moves into smooth overdrive at
higher volumes.
The MOD102-F is the foreign (Non-USA) version of the MOD 102 including a Hammond 369EX
world power transformer instead of the 269EX. Please note: there is no power cord included with
this kit (due to variations in electrical outlets around the world). You will need to find a power cord
that can fit through the ¼" diameter (6.35 mm) rubber grommet hole on the rear panel.
BASS
5
4
6
3
3
7
®
2
8
2
MOD 102
9
1
TUBE AMP KIT
10
0
1
VOLUME
TREBLE
5
5
4
4
6
6
3
7
7
2
8
8
9
9
1
1
10
10
0
0
Copyright © 2014 by modkitsdiy.com
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Related Manuals for Mod MOD 102
Summary of Contents for Mod MOD 102
- Page 1 A output section. At low volume it produces a clean chimey tone that moves into smooth overdrive at higher volumes. The MOD102-F is the foreign (Non-USA) version of the MOD 102 including a Hammond 369EX world power transformer instead of the 269EX. Please note: there is no power cord included with this kit (due to variations in electrical outlets around the world).
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Page 2: Table Of Contents
TABLE OF CONTENTS TOOL LIST …………………………………………………………………………...3 PARTS LIST …………………………………………………………………………...4 SAFETY …………………………………………………………………………...5 SOLDERING TIPS …………………………………………………………………...6 WIRING TIPS ……………………………………………........7 HARDWARE FASTENING TIP …………………………………………………...8 STEP BY STEP ASSEMBLY INSTRUCTIONS …………………………………...8 Section 1 - Mounting of Top Components …………………………………...8 Section 2 - Mounting of Front Components ………………………………….10 Section 3 - Mounting of Rear Components …………………………………..11 Section 4 - Mounting Internal Terminal Strips and Passive Components …….11 Section 5 - Connect Front Mounted Components …………………………….14... -
Page 3: Tool List
MOD 102 GUITAR AMP KIT – BACKGROUND The MOD 102 Guitar Amp Kit was designed for anyone who is interested in building their own tube guitar amplifier head. It is meant for practice amp volume (up to 5 Watts). It has an 8 ohm output impedance. (We recommend using it with a speaker cabinet that has an overall power handling of at least 10W). -
Page 4: Parts List
PARTS LIST Please see the parts list drawings for help with finding and identifying each part along with corresponding part numbers. RESISTORS: HARDWARE: Description Quantity Description Quantity 100Ω #8 self-tap screws 200Ω #6 screws 1kΩ #6 hex nuts 1.5kΩ 1/2W #6 lock washers 5.6kΩ... -
Page 5: Safety
Visit www.modkitsdiy.com if you have any problems when first turning on your amp for troubleshooting help. If you smell smoke, hear something pop, or the chassis becomes too hot to touch, turn off power and unplug immediately. SAFETY Tube amps operate at high voltages that have the potential to injure and kill. Please remember the following when working on this project. -
Page 6: Soldering Tips
SOLDERING TIPS It is important to make a good solder joint at each connection point. A cold solder joint is a connection that may look connected but is actually disconnected or intermittently connected. (A cold solder joint can keep your project from working.) Follow these tips to make a good solder joint. -
Page 7: Wiring Tips
WIRING TIPS Because of the electro-magnetic A) Twisted Wires properties of current traveling through a wire, there are wiring conventions used when making wire connections. A) Twist the wires together where indicated in the instructions. B) If two wire paths intersect, try to have them cross over each other as B) Perpendicular perpendicular as possible. -
Page 8: Hardware Fastening Tip
HARDWARE FASTENING TIP When fastening components with mounting hardware (screws, lock washers, and hex nuts), the lock washer and hex nuts should be fastened on the other side of the chassis from the head of the screw in the order pictured below. - Page 9 Step 4 – Mount the 9 pin miniature tube socket with its retainer for the EL84 Drawing 2 shows where to mount the 9 pin miniature socket “V2” and its retainer. Make sure that pins 1 & 9 face the “TR1” side of the chassis. (Use #4 hardware). Step 5 –...
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Page 10: Section 2 - Mounting Of Front Components
Step 7 – Mount the Output Transformer (TR2) Drawing 3 shows where to mount the output transformer P-T31. A) Hold the transformer up above the chassis and push the wires through their respective grommet holes as indicated on the drawing. B) Place the transformer on the chassis so that the mounting holes line up with the transformer feet. -
Page 11: Section 3 - Mounting Of Rear Components
SECTION 3 – Mounting of Rear Components Please refer to Drawing 4. Step 1 – Mount the Output Jack Drawing 4 shows where to mount the output jack. Step 2 – Mount the Fuse Holder Drawing 4 shows where to mount the Fuse holder. You can also insert the 1A fast blow fuse at this time. SECTION 4 –... - Page 12 Mount the three filter caps: 1) The 47 µF cap is soldered with negative end to T1(5) and positive end to T2(5). 2) One 22 µF (350V) cap is soldered with negative end to T1(1) and positive end to T2(2). 3) The other 22 µF (350V) cap is soldered with negative end to T1(3) and positive end to T2(3).
- Page 13 Connect T3 components: 1) Connect the 6.8K resistor from T3(2) to the “bass” pot’s cold lug, but do not solder at the cold lug side, yet. 2) Connect the .047 µF cap from T3(1) to the “bass” pot’s cold lug. Now solder at the “bass” pot’s cold lug side.
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Page 14: Section 5 - Connect Front Mounted Components
4) Connect the 200 Ω resistor from T6(1) to V2(3), but do not solder the connection at V2(3), yet. 5) Connect the 100 µF 100V cap with negative end to T6(1) and positive end to both V2(3) and V2(4), but do not solder the connection at V2(3) or V2(4), yet. SECTION 5 –... -
Page 15: Section 7 - Finish Connecting The Transformer And Power Supply Wires
Insert and Connect the Power Cord: 1) Install the grommet with ¼” center into the rear chassis hole. 2) Gently insert the power cord through this grommet hole until at least 18" (1.5 FT) are through. Tie a knot at the end of the cord so that 1" of black outside insulation extends past the knot. This knot will serve as a strain relief. -
Page 16: Section 9 - Finishing Up
Step 7 – Turn It On and Play The MOD 102 has a single-ended (class A) output stage. There is no need to check the bias, just plug the amp in, connect the output to a proper 8 ohm load, let the tubes heat up for at least 10 seconds and it’s ready to play. -
Page 17: Label Mounting Instructions
2) Then cut along the circumference, section by section, removing one sectional piece at a time. BASS BASS TREBLE TREBLE VOLUME VOLUME FRONT MOD 102 TUBE AMP KIT modkitsdiy.com 11/16" ½” 3/8" 3/8" 3/8" 3/8" ON/OFF BASS...
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