Item powers on an works as it should.  It's been part of my Parasound system for several years. I have the matching HCA-750A Amplifier and T/DQ-1600 Tuner for sale as well.All Items below are from the manufacturers web site.  [link removed by eBay]Owners Manual --> /pdfs/vintage/php850om.pdfA uniquely cost-effective preamplifier that doesn't compromise your music. A massive power supply for deeper, cleaner bass and better dynamics. The fact that it's direct coupled for the cleanest possible signal and has five inputs-including a clean RIAA phono stage for your turntable-makes this a value that's hard to beat.FEATURESFour high level inputs, one phono inputDirect coupled output100% pure Class A circuitry19,000 �F power supplyPremium Alps and Noble volume and balance controlsSilver plated OFC internal wiringSmooth sounding Analog Devices operational ampsDefeatable tone controlsAccurate RIAA curve for phono stageTiffany-style gold plated RCA jacksRemovable IEC AC cordSPECIFICATIONSFrequency Response:    10 Hz - 100 kHz, +0/-2 dB, full outputDistortion:    10 V before clippingInput Impedance:    High Level 30 k ohms, +/- 5%;    Phono 47 k ohms, +/- 5%Input Sensitivity:    High Level 150 mV;    Phono 2.5 mVMax Input Level:    High Level 9.5 V;    Phono 160 mVS/N Ratio:    High Level > 93 dB, A-weighted, full output;    High Level > 90 dB, A-weighted, full output -6 dB;    Phono > 65 dB, A-weighted, full outputMaximum Hum:    60 dB, >= 10 kHz, full outputSeparation:    > 80 dB, 60 dB,