Here is where good soldering skills and attention to detail will pay off. By following these
directions, you should be able to complete the circuit assembly quickly and without errors.
I encourage you to first read all the steps to familiarize yourself with not only the installation
flow, but also the components to be used. Appendix A has explanations on how to read the
value codes found on both the resistors and capacitors. Appendix B has helpful hints on
improving soldering skills.
Printed Circuit Board (PCB) Assembly
This PCB was designed to sound great and to maximize your customizing ability in a
compact, easy to assemble package. This PCB layout closely follows the original point-to-
point layout in order to duplicate any tone shaping created by component and wiring proximity
interactions. With over-sized traces and through-hole plating, this board will provide years of
trouble free life.
Step 1
– Gather all components necessary to complete the PCB.
Separate the components
by type; the resistors in one pile, the capacitors in another, the trim pot a third.
The resistors
will be installed first. They have no polarity and can therefore be installed in either direction.
Step 2
– Install a 1.5K / ½ watt resistor (brown, green, red, gold) in R6 position.
Step 3
– Install two 68K / ½ watt resistors (blue, gray, orange, gold) in positions R1 & R2.
Step 4
– Install two 100K / ½ watt resistors (brown, black, yellow, gold) in positions R4 & R5.
Step 5
– Install a 22K / ½ watt resistor (red, red, orange, gold) in position R8.
Step 6
– Install a 220K / ½ watt resistor (red, red, yellow, gold) in position R9.
Step 7
– Install a 1.5K / ½ watt resistor (brown, green, red, gold) in position R7.
Step 8
– Install a 470 / 3 watt resistor (yellow, violet, brown, gold) in position R10. The PC
board says 2 watt but I upgraded to a larger resistor.
Step 9
– Install a 22K / 1 watt resistor (red, red, orange, gold) in position R12.
Step 10
– Install a 10K / 2 watt resistor (brown, black, orange, gold) in position R11. The PC
board says 1 watt but I upgraded to a larger resistor.
Step 11
– Install a 22ufd/50V electrolytic capacitor in position C3. This
component has a polarity, therefore it must be installed according to case
and board markings (photo 5.1a).
Step 12
– Install a 22ufd/50V electrolytic capacitor in position C4. This
component has a polarity, therefore it must be installed according to case
and board markings.
Step 13
– Install the 100K trimmer pot (VR2, negative feedback adj.)
8 TubeDepot.com
5
Circuit Assembly
5.1
For great hints on improved soldering skills, review Appendix B at the end of this manual.
Additionally, visit:
http://www.youtube.com/user/TubeDepotTV
and watch “How To Solder”.
NOTE
CAUTION
Electrolytic capacitors DO have a polarity and must be installed into the circuit according to
the markings on the component and the PC board.
NOTE
See “Cool Mods”, chapter 10 for description on how to use this
control to fine tube this amp to your sound.
photo 5.1a
