• Quad 303 Power Amplifier World Shipping Available

    Quad 303 Power Amplifier full working order World Shipping Available . Condition is Used International shipping available to all worldwide destinations Local collection also offered
    £75.00
    1 bid
    £20.00 postage
    Ending 29 Jan at 5:06PM GMT5d 18hClick & CollectBrand: QuadType: Power Amplifier
  • Quad 303 Power Amplifier

    Great condition.
    £175.00
    0 bids
    £9.49 postage
    Ending Sunday at 9:51PM GMT3d 23hClick & CollectBrand: QuadType: Power Amplifier
  • Quad 303 power amplifier

    You are viewing a Quad 303 power amplifier in working condition. Sold with power cable only.
    £200.00
    Brand: Quad
    Free postage
    Type: Power Amplifier
  • one set Quad 303 Power Amplifier parts for DIY or Repair Amp

    All resistance for 3 X PCB use. Quantity: 1set parts Only made in world. Condition: New,NO Used.
    £27.99
    From China
    Free postage
    Brand: Quad
    or Best Offer
    Type: Power Amplifier
  • Quad 303 Vintage Stereo Power Amplifier 

    In good condition, a few flakes of paint missing, and with all original components. Performs well, with all the legendary Quad quality. Serial number 52332. Ideal candidate for a full refurb! Power output and distortion: 70Hz=0.03%, 700Hz=0.03%, 10kHz=0.1% (any level up to 28W 16 ohm load or 45W 8 ohm load).
    £82.00
    0 bids
    £14.00 postage
    Ending Saturday at 7:45PM GMT2d 21hBrand: QuadType: Power Amplifier
  • QUAD 303 POWER AMPLIFIER,EXCELLENT.

    THIS QUAD 303 POWER AMPLIFIERIS IN FULL WORKING ORDER WITH GOOD SOUND. THIS 2 PIN PLUG CAN BE CHANGED TO 3 PIN BRITISH MAINS PLUG.
    £210.00
    Click & Collect
    £12.00 postage
    Brand: Quad
    or Best Offer
    Type: Power Amplifier
    13 watching
  • Quad 303 / Power Amplifier / Vintage Classic Audiophile/ Original Piece

    This unit was last serviced by Quad on 19 June 1984, and might require servicing in the future. The amplifier is unconditionally stable and may be used with any load. Sale of fully working Quad 303, in excellent working condition.The sound is very sweet and engaging.
    £225.00
    Top Rated Plus
    FAST & FREE
    Click & Collect
    10 watching
    Brand: QuadType: Power Amplifier
  • Quad 303 power amplifier

    You are viewing 303 power amplifier in good working order and used condition. Sold with power cable only.
    £225.00
    Brand: Quad
    Free postage
    Type: Power Amplifier
    or Best Offer
  • Quad 303 Vintage 2 Channel Stereo Hi Fi System Power Amplifier (Listing Two)

    Sound Quality is Excellent. Collection is possible (outskirts of Manchester). As you can clearly see it is in Very Nice & Clean Used condition throughout. Q: Where Did You Get It From ?. It is in full working order throughout.
    £179.99
    Click & Collect
    £14.99 postage
    Brand: Quad
    11 watching
    Type: Power Amplifier
  • Quad 303 power amplifier

    Quad 303. Recapped but has damage to heat sink fins. Delivery to UK mainland - Free for  'buy it now' £6.89 for offers. 
    £200.00
    Brand: Quad
    Free postage
    Type: Power Amplifier
    or Best Offer
  • Quad 303 Vintage 2 Channel Stereo Hi Fi System Power Amplifier (Listing One)

    Sound Quality is Excellent. Collection is possible (outskirts of Manchester). As you can clearly see it is in Very Nice & Clean Used condition throughout. Q: Where Did You Get It From ?. It is in full working order throughout.
    £179.99
    Click & Collect
    £14.99 postage
    Brand: QuadType: Power Amplifier
  • one set Quad 303 Power Amplifier bare Boards + parts for DIY or Repair Amp

    Power boards x1. amp boards x2. all resistance for 3 X PCB use. Quantity: 3 boardscs parts Only made in world.
    £39.99
    From China
    Free postage
    Brand: Quad
    or Best Offer
    Type: Power Amplifier
  • Quad 33 Preamp 303 Power Amp FM3 Tuner

    The auction is for a Quad 33 preamp, 303 power amp and FM3 tuner. It also includes all the necessary cables and the original wooden cabinet that the preamp and tuner fit into. The pre and power amps are in good working order. All inputs have been tested and it has been used as a 2nd stereo system until recently. The tuner is UNTESTED so I do not know if it is working or not. There is some cosmetic damage to the cases which I’ve tried to show in the photos. Nothing much but they are not in pristine condition. Lovely sounding classic British amplifier. Low starting price with no reserve. No buy it now so good luck with the bidding and please contact me with any questions. Shipping to the UK only.
    £77.00
    5 bids
    £30.00 postage
    Ending Saturday at 7:01PM GMT2d 20hBrand: Quad
  • Quad 303 Power Amp, Quad 33 Amp, Quad 3 Radio - Hi Fi Seperates

    Quad Hi Fi as pictured. Currently the radio is on when its switched on at the mains. Radio works and clearly picked up a station with no aerial attached. 5 pin din lead to connect radio to amp. 4 pin din lead to connect amp to power amp.
    £300.00
    Click & Collect
    Free postage
    Brand: Quad
  • Quad 303NA Amplifier Upgrade (you send us your amplifier).

    Fidele Audio Quad 303NA Amplifier Upgrade (Using my last original Net Audio Kit for the amplifier modules). This full amplifier upgrade is based on the Net Audio 303 upgrade. Fidele worked with Net Audio on 303 upgrades by providing a build and test service for Net Audio when required.
    £265.00
    Click & Collect
    £15.00 postage
    Brand: Quad
    16 watching
    Type: Power Amplifier
  • Quad 303 Amplifier Power Amplifier Power Amplifier

    Verstärker - Endstufe. -- Quad 303. -- Technisch in einem einwandfreien Zustand.
    £289.10
    From Germany
    £31.46 postage
    Brand: Quad
    or Best Offer
    40 watching
  • A set Quad 303 Power Amplifier bare Boards for DIY or Repair Amp x2 Power x1

    Quantity: 3 boardscs Only made in Beijing.
    £13.99
    From China
    Free postage
    Brand: Quad
    35 watching
    Type: Power Amplifier
  • Quad 303 power amp with mains cable AND manual Serviced/ warranty Fab sound!

    Classic Quad 303 stereo power amp with the Bulgin mains cable and original manual that also includes 33 details. Serial number 63714 out of 94000 made. Decent cosmetics for it’s age, superb sound. Just Serviced by specialist, several capacitors, resistors and a transistor) and sold with 60 day returns to me warranty. Shipping to EEC is 29 gbp Shipping worldwide
    £147.00
    0 bids
    £8.00 postage
    Ending Friday at 8:15AM GMT1d 9hClick & CollectBrand: QuadType: Power Amplifier
  • Quad 33 Preamp, Quad 303 Power Amp and Quad FM2 Tuner

    Quad 303,Quad 33 and Quad FM 2 Tuner. Great condition, all just serviced by Quad Huntington (at a cost of over £300) so in perfect working order and still in shipping packages.
    £450.00
    0 bids
    or Best Offer
    Ending Sunday at 1:23PM GMT3d 14hCollection in personBrand: Quad
  • Quad 33 Pre-Amp and 303 Power Amp. Fully working and in use until Christmas 2018

    £200.00
    0 bids
    £25.00 postage
    Ending 30 Jan at 7:50PM GMT6d 21hClick & CollectBrand: QuadFeatures: Tone ControlColour: Grey
  • QUAD 33 303 Amplifier / Preamp Owner n Service Manual

    To New Quad 33/303 FANs or to Service / Repair your Quad 33/303 preamp/ power amplifier. This is an Instruction Manual and AComprehensive Schematic Manua l in PDF(download) for the Quad 33/303 Amplifier.
    £3.00
    From Malaysia
    Free postage
    Brand: UnbrandedType: Power Amplifier
  • Quad 33 Pre-Amp and 303 Power Amp. Vintage Amplifier c1970s

    Power cables included. Personal pick up available from Wyoming, NSW. Get images that.
    £247.87
    From Australia
    £165.24 postage
    Type: Power Amplifier
    13 watching

25 items found from eBay international sellers

  • QUAD Integrated amplifier model-33+power amplifier model-303 O/H completed Used

    OH completed. Works perfectly. Used only 5 months, in very good condition. This product is designed to be used in Japan. (it might be more than a month). so, do not worry about it. EMS USD 226 USD 226 USD 261 Ask.
    £2,777.99
    From Japan
    £201.40 postage
    Brand: QuadType: Integrated Amplifier
  • Quad 303 Power Amp (2 units)

    Etapas de potencia amplificadores quad 303 en buenas condiciones funcionando El precio es por la pareja Gracias Stages of power amplifiers Quad 303 in good working condition The price is for the couple Thank you
    £350.54
    From Spain
    £70.11 postage
  • QUAD 303 Power Amp

    £208.85
    0 bidsEnding Thursday at 12:55PM GMT14h 14mFrom Switzerland

Qualities of the Quad 303 Power Amplifier

Designed mainly for domestic use, the Quad 303 Power Amplifier is a two-channel stereo power amplifier that was manufactured by the British company, Quad Electroacoustics between 1967 and 1985. Now it's a much sought-after, vintage amp due to its much-admired design. If you're looking for a Quad 303 Power Amplifier, you'll find a tempting selection of previously used models available on eBay. Many of the models on offer have been given the care they deserve by their owners and are in almost pristine condition.

How powerful is the Quad 303 amplifier?

The amplifier is designed to deliver up to 45 watts of power per channel to a pair of loudspeakers with impedance values of between 4 and 16 ohms. The amp was designed to be matched to the company's own ESL 57 electrostatic speakers, but any high quality speakers within a 4 to 16 impedance range and capable of handling 45 watts of power or more will work well with the Quad 303 Power Amplifier.

How large and heavy is a Quad 303 Power Amplifier?

Solid, sturdy and weighing 8.2 kilograms, the Quad 303 Power Amplifier stands 159 millimetres in height, is 120 millimetres wide, and has a depth of 324 millimetres. See the manufacturer site for details.

What makes the Quad 303 Power Amplifiers so popular?

The quality of construction and the design of its internal circuitry provide performance characteristics that are still highly impressive. These include:

  • Frequency response: With a frequency response of 30Hz to 35kHz, you can enjoy a very wide audio spectrum from the deepest bass notes, through the mid-range frequencies and all the way up to the highest limits of human pitch audibility.
  • Signal to noise ratio: The amp's 100dB signal to noise ratio ensures that any generated noise from the internal electronics will be insignificant compared to the strength of the audio signal.
  • Total harmonic distortion (THD): The 303's THD of 1% ensures extremely faithful signal transfer through the amplification stages, resulting in high signal purity being delivered to the loudspeakers.
  • Ventilation: The outer casing of the amp is designed with ventilation grills and fins that dissipate generated heat very efficiently. This enables the amp to run continuously with no adverse effects on its performance.
Content provided for informational purposes only. eBay is not affiliated with or endorsed by Quad Electroacoustics Ltd.