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Onkyo M-504 Power Amp and P-304 Preamp

Excellent 9/10 condition | Operates perfectly | Beautiful late vintage amp and pre!

A great piece of what I would consider late vintage gear. Very well taken care of an operating perfectly. I am replacing the incandescant bulbs on the VU meters with matching green LED's. I can have my tech install an iec input for the power amp if you would like to be able to use something other than the captive cord (at an extra expense). These pieces would make a fantastic starter system. They are powerful, sound great, and you have a built in phono stage! Just add a turntable and speakers and you have a very nice entry level system.

The M-504

The Onkyo M-504 amp pumps out 165 watts per channel of authoritative power. That's more than enough muscle to drive low-impedance loads at lifelike listening levels without losing any musical delicacy and subtlety. Take off the top and you'll discover the secrets behind the M-504's efficiency: true, dual-mono construction, Onkyo's Real Phase circuitry, patent-pending linear switching and completely discrete output stage circuitry.

This unit has the original side panels, and is exceptionally clean. Front, top, and sides appear to be scratch free. This is a gem.

Specifications

• Power output: 165 watts per channel into 8Ω (stereo)


• Frequency response: 1Hz to 100kHz


• Total harmonic distortion: 0.003%


• Damping factor: 140


• Input sensitivity: 1V


• Signal to noise ratio: 120dB


• Dimensions: 465 x 185 x 422mm


• Weight: 22.5kg

Web page for M-504

The P-304

The companion preamp for the M-504 has Phono inputs, CD input, and 3 other analog inputs. This also has the matching side panels and is also in outstanding cosmetic condition.

Specifications

• Frequency response: 0.8Hz to 170kHz


• Total harmonic distortion: 0.0005%


• Input sensitivity: 0.16mV (MC), 2.5mV (MM), 150mV (line)


• Signal to noise ratio: 81dB (MC), 92dB (MM), 100dB (line)


• Output: 150mV (line), 1V (Pre out), 6V (Pre out Max)


• Dimensions: 465 x 102 x 403mm


• Weight: 7.8kg

Owner's manual for P-304

Service Manual for P-304

I do not have the original boxes for these, but will professionally pack and insure them.