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Section 1: About This Manual
This manual gives the information needed to build and install the upgraded power supply
and amplifier modules for either Dynaco’s SCA-80(Q) Integrated Amp. The is another
manual that covers installation of this kit into a Stereo 80 Power Amp.
This kit upgrades the power amplifier and power supply sections. It’s also an easy
alternative to the rather difficult repair of the amplifier section of these units. The
resulting amp offers lower distortion and noise, a speaker relay for pop-free startup, It’s
also a cooler running, more efficient amplifier. The original amp modules dissipate 13
Watts at idle, all of it running through the 4 big power resistors. The new amp module
dissipates 8.6 Watts, but all of that power biases the output stage, greatly increasing its
linearity.
Who Should Attempt this Project?
You can build this kit if you can:
1.
Solder (using normal rosin core solder and a soldering iron).
2.
Use simple hand tools like screwdrivers, wire cutters, and pliers.
3.
Read and follow directions.
It helps if you:
1.
know a bit about electronics, or
2.
have a friend who knows a bit about electronics
3.
can get to YouTube to watch a few helpful videos about the assembly process
(none are posted as of this version of the manual).
Tools you’ll need
You’ll need the following tools:
1.
Phillips screwdriver (#1 and #2), regular screw-drivers.
2.
Pliers or nut drivers suitable for #4 and #6 hardware
3.
needle nose pliers (helpful, but not strictly necessary)
4.
pencil type soldering iron of 25 to 50 Watts (no huge honking soldering guns or
blowtorches)
5.
wire cutters and strippers
6.
multi-meter to measure power supply voltages and confirm resistor values
(strongly recommended)!
Helpful Tools
These tools aren’t strictly necessary, but make building the kit easier.
1.
Magnifying glass, if you’re over 42!
2.
Lead bending jig to form axial component leads to the correct span for insertion in
the PCB.
Project Overview
The project consists of the following steps:
1.
Building the circuit boards.
