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Details about  Quad 405-2 Current Dumping Amplifier

Quad 405-2 Current Dumping Amplifier

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Item information

Item condition:
Used
Ended:
17 May, 2012 14:24:56 BST
Winning bid:
£118.66
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4 bids ]
Postage:
Collection in person offered. | See details
 
Item location:
Northampton, Northamptonshire, United Kingdom
 
Posts to:
Collection in person only
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Payments:
International postage and import charges paid to Pitney Bowes Inc. Learn More- opens in a new window or tab
Returns:
Returns accepted See details
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eBay item number:
180877186450
Seller assumes all responsibility for this listing.

Item specifics

Condition:
Used: An item that has been previously used. The item may have some signs of cosmetic wear, but is fully ... Read moreabout the condition
 
Quad 405-2
Fully Operational
Cosmetic damage, scuffs etc as expected with a used item.

Very Heavy So collection Preferred From NN1 5EW

You May Arrange A Courier, Message For Details.

he Quad 405-2, The Current Dumping Amplifier (Page 1)

Current dumping is a Quad invention, and describes the first successful application of feed-forward error correction to audiopower amplifiers. A current dumping amplifier consists of a high power heavy duty amplifier, and a low power very high quality amplifier. The low power amplifier is arranged so that it constantly monitors input and output. It detects any difference and feeds forward the necessary correction to the output of the main amplifier. Quality is solely dependent upon the performance of the low powered high quality amplifier together with four passive components. When correctly designed all distortion in the output stage is reduced to zero. Clicck to enlarge

With this technique it is possible to produce an amplifier of very high performance without using carefully matched relatively fragile output devices. There are no crossover biasing problems, no alignment or adjustment is required to obtain optimum performance and nothing can go out of alignment during life. In the event of component failure, replacement can be effected and performance restored without realignment.
"Current Dumping" was originally presented as a paper to the AES 50th Convention. Since then a number of technical articles and papers have appeared which confirm the inherent advantages of current dumping over conventional class B techniques. Reliability of the Quad 405-2 is assured by an elegant Quad designed protection circuit which overcomes the problems associated with conventional 'load line' protection circuits. The load sensitive time dependent circuit effectively places no limitation on the amplifier when playing music programme through loudspeakers but provides full protection for the amplifier should anything go wrong. The Quad 405-2 also incorporates speaker protection circuitry which prevents damage to the loudspeaker in the unlikely event of component failure in the amplifier. The Quad 405 has won both a Design Council Award 1976 and The Queen's Award for Technological Achievement 1978.

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Postage and packaging

Item location: Northampton, Northamptonshire, United Kingdom
Postage to: Will arrange for collection only (no delivery).
Domestic dispatch time
Will usually dispatch within 3 working days of receiving cleared payment - opens in a new window or tab.

Returns policy

Return policy details
7 days if item faulty

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Payment method Preferred/Accepted  
Credit or debit card through PayPal
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