This is modified Sony PS-1 "Playstation" CD Player, SCHP-5501.
It was painted black color to give it a bit more "solid" appearance.
I modified and tested it for a while in my audio system. Sony did a great job putting in excellent DAC in its early Playstation models. Modifications to this player yield excellent sonic results.
Model SCPH-5501 uses the same Asahi Kasei AK4309AVM DAC as Model SCPH-1001 which gives this player a superb audio quality with lots of detail, dynamics and resolution.
5501 uses better laser pickup assembly, it is auto-biasing for proper tracking (important for reading CDR) and positioned further from power supply to avoid interference and heat.
Modified output stage - "dogbreath" mod - DAC direct output using nos ERO MKP capacitors and dale resistors, using silver Teflon wire.
Laser transport disassembled, cleaned, lubricated and damped.
Chassis is damped (player is now much heavier)
Power supply electrolytic caps upgraded with Nichicon and Panasonic caps.
Stock feet replaced with polyurethane.
Vents are added in the case to help dissipate the heat from the power supply.
Added integrated remote control, so it functions like a full featured CD player, no need for "umbilical" controller.
Shipping within CONUS via USPS - $12.00
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