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Check and Test Your Work
You're about to check and test your work. Please recall that there are potentially lethal
voltages in the amplifier. Please continue to work safely.
1. Make sure that the AC cord is still disconnected from power.
2. Verify that the positive terminals of the new C9 capacitor configuration are
connected together.
3. Verify that the wires connected to the positive and negative terminals of C9
cannot, under any foreseeable circumstance, come into contact!
4. Place the rocker power switch in the SCA80(Q) in the ON position.
5. Plug the amplifier power cord into a power outlet.
6. There may be the usual "bong" as the amp powers up, but there should be nothing
else notable.
7. After 30 seconds or so, check the DC voltage on the new C9. Although it isn't
regulated, it should be somewhere in the range from 68 to 76 volts if everything is
working correctly. The nominal voltage is 72 Volts.
Safety First – remember to unplug the amplifier and let the capacitors discharge before
working on the amplifier. These new caps will hold charge for a long time. It's safe to
work on the amp after the new C9 voltage is less than about 12 volts.
Reassemble the Amplifier
Remove the power cord and wait one full minute before proceeding. Reinstall the
amplifier cover using the five sheet-metal screws that hold it in place.
Results
Once you've placed the amplifier back in service, you may notice the following:
1. It takes a little longer for the power supply to reach full voltage (a few seconds).
2. Upon turning power off, the amplifier will continue to produce sound longer than
it previously would.
3. More extreme low bass power will be available.
References
Be sure to visit
www.updatemydynaco.com
the latest version of this manual.
to see the latest information, or to download
Page 11 of 12
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