Fully tested and working fine . This is a vintage Onkyo Integra P-304 stereo preamp preamplifier. It is a high-quality preamplifier designed by the brand Onkyo. The model number is Onkyo P-304, and it is described as clean in the title of the listing.

Fully tested and working fine . This is a vintage Onkyo Integra P-304 stereo preamp preamplifier. It is a high-quality preamplifier designed by the brand Onkyo. The model number is Onkyo P-304, and it is described as clean in the title of the listing.

It is rare to find a 504/304 combo in such good condition, which is why I paid a premium for it. I have fully serviced both units and is now offered for sale. I installed new Gold plated RCA jacks on the P-304, and serviced all knobs/ pots. Everything works great. On the M-504, the bulbs were fine, but they die over time. So I installed two Straw-hat LEDs next to them which should outlive the incandescent bulbs. The unit was properly biased, and the meters calibrated. They were both off when I received the unit. Both units have custom Ash grain side panels in a dark Jamoca color. I personally chose the board such that the grain pattern continues from the pre-amp to the power amp. Both units (given their age are not perfect) but in super excellent condition. Those green meters are a joy to look at. I took several photos to help you see the value of this combo.

It is rare to find a 504/304 combo in such good condition, which is why I paid a premium for it. I have fully serviced both units and is now offered for sale. I installed new Gold plated RCA jacks on the P-304, and serviced all knobs/ pots. Everything works great. On the M-504, the bulbs were fine, but they die over time. So I installed two Straw-hat LEDs next to them which should outlive the incandescent bulbs. The unit was properly biased, and the meters calibrated. They were both off when I received the unit. Both units have custom Ash grain side panels in a dark Jamoca color. I personally chose the board such that the grain pattern continues from the pre-amp to the power amp. Both units (given their age are not perfect) but in super excellent condition. Those green meters are a joy to look at. I took several photos to help you see the value of this combo.

Owned these units for 6 yearsLove them. Work well.Cleaning out my office and decided to offer these for an avid analog fan.Selling both units together as is for $1300.Prefer local pick up, but will ship.

It is rare to find a 504/304 combo in such good condition, which is why I paid a premium for it. I have fully serviced both units and is now offered for sale. I installed new Gold plated RCA jacks on the P-304, and serviced all knobs/ pots. Everything works great. On the M-504, the bulbs were fine, but they die over time. So I installed two Straw-hat LEDs next to them which should outlive the incandescent bulbs. The unit was properly biased, and the meters calibrated. They were both off when I received the unit. Both units have custom Ash grain side panels in a dark Jamoca color. I personally chose the board such that the grain pattern continues from the pre-amp to the power amp. Both units (given their age are not perfect) but in super excellent condition. Those green meters are a joy to look at. I took several photos to help you see the value of this combo.

It is rare to find a 504/304 combo in such good condition, which is why I paid a premium for it. I have fully serviced both units and is now offered for sale. I installed new Gold plated RCA jacks on the P-304, and serviced all knobs/ pots. Everything works great. On the M-504, the bulbs were fine, but they die over time. So I installed two Straw-hat LEDs next to them which should outlive the incandescent bulbs. The unit was properly biased, and the meters calibrated. They were both off when I received the unit. Both units have custom Ash grain side panels in a dark Jamoca color. I personally chose the board such that the grain pattern continues from the pre-amp to the power amp. Both units (given their age are not perfect) but in super excellent condition. Those green meters are a joy to look at. I took several photos to help you see the value of this combo.

for your consideration: Excellent condition, tested, works flawlessly, someo unnoticed vintage wear, please review the pics & video link. Comes From a smoke and pet free home.Will box it with extra care & attention to details.Send only with EMS delivery with tracking no.Delivery time will be between 3-7 business days. Click here to view my full range of venga vintage products Click here to view my full range of venga vintage products Click here to view my full range of venga vintage products Click here to view my full range of venga vintage products Click here to view my full range of venga vintage products Click here to view my full range of venga vintage products

Onkyo Integra P-304 Stereo Preamplifier In excellent condition. Works great. No dents, dings or scratches. Check out the pictures! Safe shipping via USPS Ground Advantage. Thanks

This Onkyo P-304 preamplifier is a high-quality audio device that is perfect for enhancing your home theater experience. With its compact design and easy-to-use controls, this preamp is ideal for those who want to streamline their entertainment system. Featuring advanced technology from Onkyo, this preamp offers superior sound quality and a wide range of connectivity options. The issue with this preamp is the right channel of phono input. Hum and distortion. Left channel is fine. All other functions are fine. Cosmetics are very nice. Only issue to note is the rosewood is lifted approximately 1/8 inch on the left side on top. If i find a few minutes to glue it back down i will update. Shipped with USPS ground mail. All Proceeds donated to animal rescue. Thank you.

Up for auction is just the pre amplifier the Onkyo p-304 that is sitting in top of the large amp. that is the smaller unit on top of the m-504 amplifier that is listed in another separate auction. If you would like both units and win both I will waive the lesser of the shipping rates and combine them both at no extra cost to the buyer. Great condition barely used.

ONLY ONE LISTED ON EBAY!!!! Onkyo INTEGRA P-304 Audiophile Grade PREAMP Bench Tested Excellent Condition. This preamplifier was professionally bench tested by Classic Audio Repair on 7/16/24 and found to be in normal working order. The unit is in excellent cosmetic condition as well. Please see the extensive pictures I have taken for the cosmetic condition. It will be shipped in its original box. It does not have the original owner’s manual but I have printed an owner’s manual and service manual that will be included in the purchase…. At time of listing I also am listing a ONKYO INTEGRA M-504 Amplifier and a ONKYO INTEGRA EQ-35 Equalizer. Both have also been BENCH TESTED. I also will be listing some other ONKYO pieces such as a CD changer, tape deck, AM/FM tuner, and a record player in the next few days. Thanks for looking and contact me with any questions. Please message me for an accurate shipping quote as it is a big heavy box and eBay has a tendency to quote the shipping costs a little higher than what it should. This will be shipped insured at the buyers cost. The handling cost is covering the shipping insurance cost.

Onkyo P-304 Stereo PreamplifierGood working condition. Everything works as it should.

Fully working Onkyo p-304 preamp, none of the knobs are original, but they work alright for the functions. Will not be accepting any returns due to it being a vintage item. Thanks for viewing!

Ex Veteran Selling Only Quality Goods. Please see my feed back. Unit is extremely nice and just serviced. SpecificationsFrequency response: 0.8Hz to 170kHzTotal 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 403mmWeight: 7.8kg

Parting ways with my one owner system, cant take it with me as the voltage is wrong. Shipping can be arranged but it is very heavy and I dont want to be responsible for damage.

For your consideration is an exceptional, all original example of the well loved Onkyo Integra P-304 preamplifier. This was used for only a few years before the original owner moved, packing this piece up in its original packing (and wrapping the preamp in a plastic bag) and left in climate controlled storage until now. This piece looks almost new. Super clean and in excellent operational condition. You really could not find a better example unless you found a factory sealed one… but that probably won’t ever happen ;) Please see all of the photos for a good visual description. This piece actually looks even better in person! Kind of hard to photograph being all black. This piece will be shipped in the original box inside a new, oversized outer box for safe delivery. Feel free to ask any questions. Thanks for looking!

Unit has been serviced and tested thoroughly. Item is ready for plug n play. Please see pics for cosmetic condition and what you will receive. Item will be packaged with extra care for safe arrival and shipped within 3 business days after payment is received. Tracking is always uploaded.

ONKYO INTEGRA P-304 PREAMPLIFIER works has scratches and dings to the top and side panels. Also has a bent/damaged phono ground lug screw on back panel as is due to age and condition....NO REFUNDS

Onkyo IntegraP-304 Stereo Preamp You are bidding on a top tier Onkyo Integra P-304 stereo preamp. This audiophile grade preamplifer is excetionally quiet with an outstanding phono section. It was widely praised by critics when initally released and was compared favorably to preamps costing $2,000 or more. It even includes gold plated Phono and CD jacks on the rear panel optimal connection quality. This is a great match for any top quality amplifier. This preamplifier has been carefully tested and is in excellent working order. Output is clear and clean in both channels. The controls and switches have been cleaned and lubed for smooth and silent operation. All lights have been checked and replaced as needed. The interior dust has been blown out with compressed air to prevent overheating and extend component life. It has a few cosmetic blemishes including tape residue on one of side panels but is in very nice overall shape as you can see in the pics. It makes a pleasing visual impression. Good luck bidding! Features For This Unit: Excellent Cosmetic Condition (Check the Pics!) Excellent Working Condition Scroll down to see how we test items. Direct Tone Passive EQ Circuit - Beatifully Clean Exceptionally Low Distortion Levels for Very Clean Output Excellent Signal to Noise Ratio Bass and Treble Controls Loudness Switch - Improves sound quality at low listening levels. Inputs For Aux (CD Players), Tape1, Tape2 , Tuner, and Phono Gold Plated Phono Inputs Gold Plated CD Inputs Supports Moving Magnet and Moving Coil Phono Cartridges Full Dubbing Capabilities Between Tape Decks Check out our other vintage audio auctions!Browse our selection of vintage audio parts!Be sure to add us to your favorites list!

Used,very nice cosmetic condition, left channel doesnt working.

Onkyo Integra P-304 Pre Amplifier sold Untested as Parts or Repair. Pretty Good Cosmetics with all knobs intact and no serious Scratches, Scuffs or Nicks. All function lites and LEDs work, power cord is solid no frays, nicks or paint. No side panels included with the unit. I have included a complete copy of the owners manual. No back story here, just picked the unit up from an estate sale last Fall. Please include $35.00 to cover Fast and Secure Shipping anywhere within the Continental US 48s Only. I ship Fast 5 days a week (M-F). Sold As Shown As Parts or Repair with No Returns. Thanks for viewing and Good Luck,

Experience the superior sound quality of this highly regarded Onkyo Integra P-304 stereo preamplifier. This preamplifier is designed to give you the best listening experience possible. With its sleek black color and durable build, its sure to impress. Made in Japan, this preamplifier is of the highest quality. Working as it should. NOT tested on phono, no turntable available. Physical wear is minimal, looks great. Sticker on back says Refurbished Unit This item dates from early 90s. Vintage audio: NO WARRANTY OR RETURNS

Onkyo Integra P304 in very good condition. Seems to be working as it should.