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Section 1: About This Manual
Does your SCA80 hum a lot more than it used to? There's a very good chance that its C9
has lost significant capacitance. This manual covers the replacement of the stock C9, a
5000 µF capacitor, with a total of 9900 µF. In addition to repairing hum problems, this
gives any Dynaco SCA80Q better bass.
Who Should Attempt this Project?
You can build this kit and improve your Dynaco SCA80(Q) integrated amplifier 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. make basic voltmeter measurements
4. 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 video about the assembly process (not available at
this time)
Tools You'll Need
You'll need the following tools to update your SCA80(Q):
1. multi-meter capable of reading the 72 Volt (nominal) DC Power supply output
2. flat blade screwdriver for #6 screws, #2 Phillips screw driver
3. pliers or nut drivers suitable for #6 hardware (5/16" nut driver or hex wrench)
4. needle nose pliers (helpful, but not strictly necessary)
5. pencil type soldering iron of 25 to 50 Watts (no huge honking soldering guns or
blowtorches)
6. wire cutters and strippers
Project Overview
The project replaces C9. The major steps are:
1. Removing the original C9.
2. Building, then installing the new C9.
3. Testing the completed result and reassembling the amplifier.
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