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Below: An Optimus (Radio Shack) CD-3470 portable CD player -- a model from 1995, which is a better-sounding successor to the infamous CD-3400. The CD-3470 lacks a digital output but, via Line Out jacks, sounds better and has much better shock immunity than the CD-3400.
Below: In 1995, I modified the CD-3470 for improved audio fidelity by applying rope caulk or adhesive tacky putty inside, beneath and in the battery compartment of the unit's chassis. I also made an isolation stand using a sheet of cardboard and foam strips.
Below: The top of the CD-3470's printed circuit board (PCB); transport is in the background. Notice the yellow tacking plastic in the battery compartment.
Below: The bottom of the CD-3470's printed circuit board (PCB).
Below: A closer look at the CD-3470's Line Out and Headphones out section. High-quality Elna capacitors (yellow "cans") are utilized on this model.
All about the Radio Shack Optimus CD-3470 Portable CD Player:
(Radio Shack catalog number: 420-5053)
The Radio Shack Optimus CD-3470 Portable Compact Disc Player uses the latest (circa 1995) digital audio technology to give you clean, crisp sound from your compact discs. You can connect the CD player to your home audio system or connect it to a pair of stereo earphones for portable, private listening.
The CD player's advanced technology makes it simple to operate. Be sure you read this owner's manual completely so you can take advantage of all its advanced features.
If you're looking for service or operating manuals for Radio Shack / Optimus legacy electronic equipment, use these links:
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