PioneerM22usedPioneer M-22 Class A Amplifier - Unique and Classic Piece (2 of 2)**Please click here to check out our newly launched SkyFi Audio website with additional items for sale** This is a Full Class A Power Amplifier produced from 1977-1980 during a golden era of Pionee...2499.00

Pioneer M-22 Class A Amplifier - Unique and Classic Piece (2 of 2)

Listing ID: lisa1321 Classified 
 Listed  · 541 Views

5 Watchers

Items from this seller

Time Left: None

This listing has ended.

Condition
7/10
Payment methods

Contact seller after sale to pay viaCertified check, Personal check, Wire Transfer or Express Checkout

Ships fromGlen Rock, NJ, 07452
Ships toUnited States
Package dimensions?" × ?" × ?" (99.0 lbs.)
Shipping carrierUPS
Shipping cost$60.00
AverageResearch Pricing

**Please click here to check out our newly launched SkyFi Audio website with additional items for sale**

This is a Full Class A Power Amplifier produced from 1977-1980 during a golden era of Pioneer and has a solid fan following.

As a Full Class A amplifier It idles hot - and rightfully so.

This unit was previously serviced by another shop before arriving at SkyFi. Their work included upgrading the power supply rectifiers, replacing some tired power supply capacitors, changing the power cords, and replacing all of the output transistors. 

The original TO-3 package transistors have been changed to an alternate model with a different package shape. The new Sanken 2SC2921 / 2SA1215 are well regarded audio output transistors and have been confirmed authentic (Yes there are some nasty counterfeits out there). 

We performed some additional maintenance on the unit including replacement of a known troublemaker axial capacitor in the power on delay circuit. We also burnished all of the relay contacts, replaced the indicator lamps, and set the DC offset & Bias to service manual spec.

This is a beautifully designed piece of equipment that is also one of the easiest we've ever come across to work on. It incorporates a dual mono topology, with each channel receiving its own power transformer and power supply components. 

The solid cast aluminum chassis sets it apart from other power amplifiers of the era giving it a timeless industrial look. It also features multi-function speaker binding posts that can accommodate spades, bananas, and bare wire.

Click here for a PDF copy of the Pioneer M22 Owner's Manual

Click here for a PDF copy of the Pioneer M22 Service Manual (13MB)

Our Testing Process for Amplifiers (Solid State) at SkyFi:

We start with a visual inspection of all internal components to make sure there are no signs of stress or aging. Capacitors are checked for telltale sings of bulging or leaking, resistors are checked for signs of overheating or cracking, and transistors are checked for signs of stress or damage. 

We then power up the unit carefully and run a simple 1k sine wave while monitoring the output on an oscilloscope for signs of distortion or noise. Finally, we run the amplifier to its full rated power into the appropriate resistive load provided by our Sencore amplifier tester. If there is an issue, it will usually be noticeable at this point. If everything reads clean, we will often test for THD (Total Harmonic Distortion) measured by our Keithley distortion meter, and compare it against the original manufacturers specifications. The amplifier then remains powered on to "burn in" on our test bench for a few hours to make sure there are no heat related issues. If there are balanced inputs available they will be also be tested.

Final testing involves pushing actual music thorough the amplifier. We've learned over time that some issues are only noticeable to a trained ear while listening to familiar source material. Our test bench has reference vintage Kef speakers that we're very familiar with which quickly reveal any discrepancies. Some amplifiers will then move into our listening room where they are tested with our in-house reference speakers of choice.

----------

Thanks for looking and please click here if you would like to receive a list of new equipment we receive weekly. We promise not to bombard you with junk email.

----------

PURCHASING FROM SKYFI

This item will be professionally packaged and insured for safe transit to your home. 

This item is also available for pickup in Glen Rock, NJ, with convenient parking near our building.

Click here for specifics on our specialized packing process that separates us from the rest.

If we don’t have the original manufacture’s packaging, we use heavy duty double-ply corrugated boxes with Instapak expanding foam custom inserts. In many cases this has proven to be better than the original packaging! We also use high quality fiber reinforced tape to seal our packages. Lightweight items will be bubble wrapped and shipped in a high-quality box. 

NJ Residents or anyone picking up without a resale certificate will need to pay NJ Sales Tax.

Thanks for looking and be sure to call us at 201-879-0000 with any questions. 

----------

WHO WE ARE 

SkyFi Audio is a small startup business specializing in the purchase, reconditioning, and reselling of select high-end audio equipment. We only buy equipment the we admire and are passionate about. No mid-fi, no gimmicks, no junk.

Each piece of equipment is cosmetically restored and fully tested in our well-equipped lab by an engineer with 30+ years of experience in the HiFi world. If it does not meet or exceed the original manufactures specifications, it will not be sold.  We are very selective about the equipment we purchase, focusing on mostly analog, high-build quality, American, and European built units.

Through our sister company, which is an authorized dealer for McIntosh, Audio Research, Sonus Faber, ClearAudio, Pro-Ject Audio Systems, and Sony ES, we have access to OEM parts, service, and support. If you’re local and looking for new equipment from the above-mentioned manufacturers, please drop us a line as we can arrange both sales and professional installation in the tri-state area.

PURCHASING GUIDELINES

We do not accept or review any offers that do not go through the official Audiogon system. We have too many items for sale and it’s nearly impossible to keep track of offers outside of the official system. Please don’t message, email, or text any offers. 

PAYMENTS

We prefer working through PayPal which allows you to use a credit card or bank transfer. We do not charge extra for any payment fees if you purchase the item at the asking price.  You can also send us a personal check (which will need to clear before shipping), certified check, money order, or wire transfer. International clients without access to PayPal should use a bank wire transfer. 

If you’re picking up an item we do not accept PayPal. You must pay in person with a certified or bank check, or wire transfer. If you make a PayPal payment and are picking up the item, your PayPal payment will be returned. 

TRADE IN POLICY 

We accept trade-ins of equal or lesser value under certain conditions. Simply click here to submit your gear for full consideration. We will only consider high-end equipment from mainstream manufacturers such as McIntosh, Mark Levinson, Audio Research, Krell, etc. and will typically pass on displays, projectors, receivers, dated surround processors, and mid-fi equipment of any type. We will offer a fair value for your equipment, but keep in mind we’re running a business and will need to be able to resell the equipment at a profit after investing a great deal of time and resources in testing, certifying, repairing, cleaning, and packaging the incoming equipment. If you’re looking for top dollar, we suggest selling it directly on your own.

SELL US YOUR GEAR (Working or Broken)

We’ll also purchase your used or broken gear and arrange pickup if you are in our local market. Simply click here to submit your gear for full consideration.

SCHEDULING AN APPOINTMENT                                                                                                       

We are currently operating from our shop located inside our dedicated building in Glen Rock, NJ. You’re welcome to make an appointment if there’s a piece of equipment you’d like to see in operation before or after purchase. We have several well-equipped, dedicated listening areas plus a dedicated studio with tons of equipment of all makes and models. We’re not a store, so please don’t make an appointment if you’re just curious as to how a speaker or piece of equipment sounds. In essence - no tire kickers please.

You can call or text 201-879-0000 with any questions, or to schedule an appointment. We can also arrange to install, calibrate, and tune your newly purchased gear in your listening room if you’re local to our area. This is super useful when purchasing large speakers or heavy amplifiers. It’s also great for ensuring your new turntable is setup correctly in its final resting place.

v3.0

No questions have been asked about this item.

Ask the seller a public question

You must log in to ask a question.

Return Policy

Return Window

Returns are not accepted on this item.