Mod 102+ Manual Download Page 3

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 8 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).  Use 16 AWG speaker 
cable to connect from the amplifier to your speaker cabinet.

The web-site 

www.modkitsdiy.com

has been set up to help answer your questions after you have thoroughly 

read through the entire set of instructions.

3

TOOL LIST

Wire Strippers

Needle Nose Pliers

Cutting Pliers

Desoldering Pump

Solder (60/40 rosin core)

Soldering Station

Phillips Head Screwdrivers

Slotted tip screwdrivers (3mm tip)

Digital Multimeter (DMM)

Alligator Clip Test Leads (to fit DMM)

Channellock Pliers (or similar type)

Miniature Round File (fine cut)

Summary of Contents for 102+

Page 1: ...ve at higher volumes MOD 102 GUITAR AMP KIT K MOD102 features include a three position progressive toggle switch for off standby power and additional push pull functionality for each control Pull out...

Page 2: ...11 Section 4 Mounting Terminal Strips and Components 11 Section 5 Connect Rear Mounted Components 15 Section 6 Connect the Tube Filament Wiring 16 Section 7 Finishing Up 16 Label Mounting Instructions...

Page 3: ...Use 16 AWG speaker cable to connect from the amplifier to your speaker cabinet The web site www modkitsdiy com has been set up to help answer your questions after you have thoroughly read through the...

Page 4: ...Description Quantity 12AX7 ECC803 1 6BQ5 EL84 1 TRANSFORMERS Description Quantity Power Transformer 269EX 1 Output Transformer P T31 1 4 CAPACITORS Description Quantity 150pF 500V 1 250pF 500V 1 022...

Page 5: ...t one time may have high voltage present ON STANDBY The one hand rule pictured below is a safety precaution for working on an amp that is plugged in or could potentially have high voltages present Usi...

Page 6: ...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 7: ...ings and then cutting it with your wire cutters at a length that will give it a little bit of slack after stripping off the insulation and soldering It is important not to make the wires too long Be c...

Page 8: ...Component Mounting Bracket 4 Step 3 Mount the 9 pin miniature tube socket for the 12AX7 with its tube shield Drawing 2 shows where to mount the 9 pin miniature socket V1 Make sure that pins 1 9 face t...

Page 9: ...side handles 4 4 2 Step 6 Mount the Power Transformer TR1 Remove the 269EX power transformer from its packaging Drawings 2 3 show where to mount the power transformer A Cut off the gray wire as descri...

Page 10: ...the Controls Drawing 4 shows where to mount the bass treble and volume pots Remove the two nuts and two flat washers from the 250K Bass and Treble pot bushings On each pot put one nut on the bushing...

Page 11: ...blow fuse at this time FUSE F U S E F U S E SLEEVE TIP Remove the nut and flat washer from the input jack Put the remaining 3 8 lock washers on the jack bushing and mount it to the rear panel with th...

Page 12: ...end to T2 5 3 5 Connect wires to filter caps 1 Connect a 1 length of white wire from T1 3 to T1 1 When connecting the wire you want to strip about of insulation off of each end to wrap around terminal...

Page 13: ...Body ground terminal Tip When making the capacitor connections at this pot it is important that the leads do not accidentally touch the pot switch body or a different lug than intended If you feel it...

Page 14: ...onnect the remaining 047 F cap from T4 5 to turbo switch lug 2 1 Connect a 2 piece of white wire from T4 5 to V1 pin 1 Consider using the lower terminal hole 2 Connect a 2 piece of white wire from T4...

Page 15: ...3 yet 6 Connect the 100 F cap with negative end to T6 1 and positive end to V2 pin 3 Solder all connections Connect the transformer wires 1 Intertwine TR1 s two green wires and connect one to each of...

Page 16: ...but do not solder one wire to V2 4 and the other to V2 5 3 Cut two more pieces of green wire about 5 5 each and connect one wire s end to V2 4 and the other wire s end to V2 5 Now solder all connectio...

Page 17: ...ilter caps If the amp has been assembled correctly it takes about 2 minutes for the voltage on these caps to drain to less than 1 VDC after power is turned off Always use the one hand rule when workin...

Page 18: ...pe for placement over its respective chassis hole 2 Then cut along the circumference section by section removing one sectional piece at a time 1 Use a razor or x acto knife to cut along each line firs...

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