ONKYO Integra M-504 Amplifier & P-304 Preamplifier. Because this is a vintage audio unit it is sold as-is no returns. You are more than welcome to inspect and audition upon pickup to verify it is in good working order. This classic amplifier and preamplifier set is in spectacular condition both functionally and cosmetically. I've spent $400 in the last two years having both fully serviced, cleaned, and maintained. This includes LEDs added to the VU meters, parts replacements, board repair, and protection circuit replaced with new relays. The amp is fully within spec and bias as you can see in the pictures. Sound quality and performance are outstanding. Specifications • Power output: 165 watts per channel into 8? (stereo) • Frequency response: 1Hz to 100kHz • Total harmonic distortion: 0.003% • Damping factor: 140 • Input sensitivity: 1V • Signal to noise ratio: 120dB

Onkyo Integra M-504 Stereo Audio Power Amplifier. Excellent Condition as shown. Please review photos for details/condition as they are an important part of the description. If you are unsure about anything in this listing please ask questions before bidding/buying.

This auction is for an Onkyo Integra M-504 amplifier! This powered up without issue when I plugged it in, and the previous owner said it was working fine when he stuck it in his attic a few years ago. I dont have a preamp of any kind to test with, unfortunately, so powering it up was as far as I was able to go, so you could consider other aspects of this amplifier as being untested, being sold as is. Im selling this as functioning because it powered up so easily, but again, I havent hooked it up to a sound system. It does have a few scrapes on the sides (I took closeups of all sides), and a ding on the top where something was placed on top of it. If you are interested in purchasing, Im open to running any suggested tests. I offer multiple ways to ship; please be sure to check out the options so you can select whatever is cheapest - or best - for you! Being sold as is, where is, no warranty expressed or implied. Will combine shipping on multiple items whenever possible. Feel free to email with any questions! All of my items are kept in a smoke-free and hypoallergenic-pet home. I offer shipping via USPS and UPS. I do not charge extra for handling, and I only charge for shipping whatever the eBay shipping calculator designates. If you would like your package insured, please let me know, or add it to your shipping costs when totaling!

Onkyo Integra M504. Plays fine. Selling as is due to age.

Onkyo Integra M-504 Speaker 1 Button A-93this is a good working unit. see pics!fast ship!I am parting out an Onkyo M-504, please see my other listings.

Onkyo Integra M-504 Speaker 2 Button A-92this is a good working unit. see pics!fast ship!I am parting out an Onkyo M-504, please see my other listings.

If you know, you know. If not, look them up.....Offered for your purchasing pleasure is a matching set of ONKYO Integra components including the MASSIVE M-504 power amplifier with huge dual VU meters and the P-304 pre-amplifier! First and foremost, both work and are ready to use as pictured. TONS OF POWER. Video available. Read on for details: Maintenance consisted of the following:Amp chassis was dustered, was already super clean. See pic.No other cleaning done and no repairs made.The bad:Lighting on amplifier right side VU meter needs attention. Several times when turned on, the lamps would not illuminate. No apparent issues seen inside the chassis. A couple of taps on the outside would bring it on, but only one of the two lamps work. Probably easiest to change out all lamps on both sides, or run as is. Last few times we turned the amp on, the right side lit up immediately. Meter works no problem. See pics.Pre-amp is missing a REC selector knob. Replace one or both, or leave as is.Some spotting on pre-amp. Hard to notice unless youre really up close. We did a general cleaning only, some polishing may remove it. See pics.Testing/The Good:Amp has super clean and clear signal on all four speaker outputs.Tuner, CD and phono inputs are guaranteed working good, no other testing done.Both VU meters work well, bar the aforementioned lighting issue.Rosewood finish end caps are beautiful on both pieces, with some minor scratches on one panel on the amp. See pics. Please ask questions! Remember, this set weighs a ton and will not be easy to ship. Hence the charge. They will be shipped separately. Each will be secured in first box and then boxed again. Both will be insured.

Onkyo Integra M-504 Power Push Button A-91this is a good working unit. see pics!fast ship!I am parting out an Onkyo M-504, please see my other listings.

Onkyo Integra M-504 Power Amplifier and P-304 Pre-Amplifier (Matching Set) LED light on right meter needs to be replaced, went out a month ago and I never found the time to change it. Also on one side of the M-504 Power Amp there is a small white mark less than an inch long. Other than that both units are in amazing condition. All inputs and channels are working great. See pictures for exact details.

Onkyo Integra M-504 Rectifier Board 2820this is a good working unit. see pics see pics!fast ship!I am parting out an Onkyo M-504, please see my other listings.

For sale is an Onkyo Integra M-504 Stereo Audio Power Amplifier. This item is in nice vintage used working condition. Has some minor cosmetic issues. overall clean vintage condition. works well, see photos close for exact condition.

Onkyo Integra M-504 Amplifier Face plate Panel with Glass - A71There are light scratches on it please see pictures and let me know if you have questions see pics!fast ship!I am parting out an Onkyo M-504, please see my other listings.

Onkyo Integra M-504 Amplifier Board - NCPA2816this is a good working unit. see pics see pics!fast ship!I am parting out an Onkyo M-504, please see my other listings.

Onkyo Integra M-504 Amplifier Working VU Meter Panel PL885 this is a good working VU Meter Panel in excellent condition. Ive taken many pictures to show the condition. see pics fast ship! I am parting out an Onkyo M-504, please see my other listings.