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Summary of Contents for Epiphone Baby Will
- Page 1 “Baby Will” Valve Junior Conversion Build Manual “Baby Will” Valve Junior Conversion Version 4 Build Manual 22 September 2009 1 of 36...
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Page 2: Introduction
To simplify things, • The Epiphone Valve Junior will be referred to as EVJ, and • The “Baby Will” 18 Watt LiteIIb PCB will be referred to as the Baby Will. This manual guides you through the conversion which includes: •... - Page 3 Here’s a look at the Baby Will PCB if you haven’t purchased yours yet. Version 2.3 “Baby Will” Valve Junior Conversion Version 4 Build Manual 22 September 2009 3 of 36...
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Page 4: Electrical Shock Warning
GuitarAmplifierPCBs.com reserves the right to make design changes or improvements without obligation to revise prior versions. All specifications are subject to change without notice. “Baby Will” Valve Junior Conversion Version 4 Build Manual 22 September 2009... -
Page 5: Table Of Contents
Install the New Components ..................26 8.1.1 The New Output Transformer................26 8.1.2 The Baby Will PCB and Tube Hardware ............. 28 8.1.3 Hookup the Leads to the Baby Will ..............29 Turn on the Power ........................ 31 Check Your Work ......................31 9.1.1... -
Page 6: Project Overview
4.1 Here’s what you’ll need: 4.1.1 Parts: • The “Baby Will” circuit board • Misc. parts and components (refer to the VJ Conversion parts list document for a full listing of what parts are needed and where you can buy them) 4.1.2 Tools:... -
Page 7: Let's Get Started
Remove the four chassis screws and pull out the chassis. “Baby Will” Valve Junior Conversion Version 4 Build Manual 22 September 2009 7 of 36... -
Page 8: Remove The Evj's Stock Components
Pull these two spade connectors from the main circuit board. “Baby Will” Valve Junior Conversion Version 4 Build Manual 22 September 2009 8 of 36... - Page 9 Now that all of the leads are free, remove the mounting screws to separate the transformer from the chassis. “Baby Will” Valve Junior Conversion Version 4 Build Manual 22 September 2009 9 of 36...
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Page 10: Clean Up The Power Transformer
These need to be pulled outside and secured as well. After the leads are all pulled outside the chassis, bundle them together and tie them off. “Baby Will” Valve Junior Conversion Version 4 Build Manual 22 September 2009 10 of 36... -
Page 11: Remove The Volume Potentiometer
Lift the ground wire from the star ground post. Unplug the input jack wire at the circuit board. Remove the six (6) screws fastening the circuit board to the chassis. “Baby Will” Valve Junior Conversion Version 4 Build Manual 22 September 2009 11 of 36... - Page 12 Salvage the ground wire from the stock circuit board for use later. Unscrew the input jack and remove it from the chassis. Set it aside for use later. “Baby Will” Valve Junior Conversion Version 4 Build Manual 22 September 2009 12 of 36...
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Page 13: Prepare The Chassis
6. Prepare the Chassis 6.1 Layout and Drill The Baby Will circuit board, tone potentiometer, and the new output transformer require some drilling in the chassis. 6.1.1 Layout the Drill Plans Always verify you are using the latest version of the drill plan posted on GuitarAmplifierPCBs.com. -
Page 14: Drilling The Chassis
Here, a unibit was used to drill out the 7/8” hole for the two (2) additional tube socket holes. Deburr or countersink each hole to ensure no sharp edges will cause injury or component failure. “Baby Will” Valve Junior Conversion Version 4 Build Manual 22 September 2009 14 of 36... - Page 15 Version 2.3 of the Baby Will circuit board was designed to use most of the stock chassis mounted pcb standoffs. However, you need to remove one (1) standoff for the board to fit. Drill out and remove the stock standoff as shown in the picture below.
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Page 16: The Baby Will
7. The Baby Will 7.1 Assemble the Baby Will Circuit Board The anticipation has been killing you, hasn’t it? Finally, the assembly of the Baby Will begins. Did you check you make sure you have all of the parts you’ll need to complete the assembly? I wish I did. -
Page 17: Pcb Standoffs
Orient the diodes as indicated on the circuit board. Bend the leads over, insert them into the board, and bend them to the side as shown. Solder them to the board. “Baby Will” Valve Junior Conversion Version 4 Build Manual 22 September 2009 17 of 36... - Page 18 Install, solder and trim all of the resistors in the power grid as shown. Refer to the latest version of the schematic on GuitarAmplifierPCBs.com, the Baby Will circuit board, and the component package to identify, locate and position component values.
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Page 19: Signal Path And Cathode Resistors
Install, solder and trim all of the signal path and cathode resistors as shown. Don’t bother with the input section. We’ll get to that later. 7.1.5 Sag Resistor Install, solder and trim the sag resistor as shown. “Baby Will” Valve Junior Conversion Version 4 Build Manual 22 September 2009... -
Page 20: Signal Path And Cathode Capacitors
7.1.7 Hum Balance Version 2.3 of the Baby Will circuit board is equipped with a DC elevated artificial center tap. It uses two (2) 100 ohm 1% resistors to tie each lead of the tube heater supply to the cathodes of the power tubes, which operate at around 10Vdc. -
Page 21: Filter Capacitors And Ground Wire
(as indicated by the downward arrow and “-“ symbol) in the round pad. Insert the ground wire that was removed from the stock EVJ circuit board in the ground pad indicated on the Baby Will circuit board. Solder and trim the leads. 7.1.9 Jumper Wires Three jumper wires need to be installed. -
Page 22: Input Jack Hookup
7.1.10 Input Jack Hookup The input section of the Baby Will is designed to accommodate a variety of configurations. The VJ Conversion only calls for one input jack. This requires a jumper to tie the two input leads together so the two halves of V1 (12AX7) work in parallel. - Page 23 Insert the white lead into the input #1 (“IN-1”) pad and the black lead into a ground pad. Solder and trim. The input section is done. “Baby Will” Valve Junior Conversion Version 4 Build Manual 22 September 2009 23 of 36...
- Page 24 Here’s what everything should look like so far - minus the input jack wiring. Oops, this picture is missing the ground wire, too. “Baby Will” Valve Junior Conversion Version 4 Build Manual 22 September 2009 24 of 36...
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Page 25: Volume And Tone Controls
It’s not the best work we’ve done. The best resource is the layout diagram. The volume and tone controls are connected to the Baby Will circuit board by flying leads. Remove the controls from the chassis and install the leads in the board. -
Page 26: Putting It All Together
8.1 Install the New Components Now that everything is out of the chassis that we don’t need, the chassis has been drilled, and the Baby Will has been assembled, we can prep the chassis and install all of the new components. - Page 27 Re-Install the output jack board into its stock location. Guide the ground wire from the output jack board to the star grounding stud. This will be secured to the stud later. “Baby Will” Valve Junior Conversion Version 4 Build Manual 22 September 2009 27 of 36...
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Page 28: The Baby Will Pcb And Tube Hardware
8.1.2 The Baby Will PCB and Tube Hardware Lay the Baby Will down into the EVJ chassis with the tube sockets toward the chassis and the diodes toward the power rocker switch. Align the standoffs with their respective holes and fasten a screw into the standoff(s) near the power transformer. -
Page 29: Hookup The Leads To The Baby Will
Repeat the process described above for the heater and output transformer leads. Here’s an image of all of the hookups installed and soldered into place. Fasten the ground wires from the Baby Will circuit board and the output transformer to the star ground screw post. - Page 30 Here’s how it should look when everything is hooked up. Good Job! You’re almost done. But, before you start celebrating, you still have to review your work, start it up and test the voltages. “Baby Will” Valve Junior Conversion Version 4 Build Manual 22 September 2009...
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Page 31: Turn On The Power
The fuse should be rated for 2A Slo-Blo. • Check that the heater element supply (orange wires) is equipped with a good fuse. The fuse should be rated for no more than 4A Slo-Blo. “Baby Will” Valve Junior Conversion Version 4 Build Manual... -
Page 32: Power Up Without Tubes
Switch the amp’s power switch to the “ON” position. With your voltmeter, check the following voltages. If a significant deviation from these readings is observed, turn off the amp, unplug the mains power and investigate. “Baby Will” Valve Junior Conversion Version 4 Build Manual... - Page 33 “Baby Will” Valve Junior Conversion Version 4 Build Manual 22 September 2009 33 of 36...
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Page 34: Power Up With Tubes
Switch the amp’s power switch to the “ON” position. With your voltmeter, check the following voltages. If a significant deviation from these readings is observed, turn off the amp, unplug the mains power and investigate. “Baby Will” Valve Junior Conversion Version 4 Build Manual... - Page 35 “Baby Will” Valve Junior Conversion Version 4 Build Manual 22 September 2009 35 of 36...
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Page 36: Finish Things Up
Press them in until they are flush with the cabinet surface. Attach the back panel with the stock screws. Congratulations! Your Valve Junior is complete. Plug in a guitar and enjoy the legendary tone of your 18 Watt LiteIIb “Baby Will” guitar amplifier. “Baby Will” Valve Junior Conversion Version 4...
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