Bidding has ended on this item.

 
Posts to:
Collection in person only
Delivery:
 
Posts to:
Collection in person only

Details about  Quad 405-2 Current Dumping Amplifier

See original listing
Quad 405-2 Current Dumping Amplifier
Quad-405-2-Current-Dumping-Amplifier
Item Ended
Item condition:
Used
Ended:
17 May, 2012 14:24:56 BST
Winning bid:
£118.66
4 bids ]
Postage:
Collection in person offered. | See details
Item location:
Northampton, Northamptonshire, United Kingdom

Description

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.

Posted with eBay Mobile

Questions and answers about this item

No questions or answers have been posted about this item.




Place bid

Time left:
Current bid:
(Approximately ##1##)
Postage:
Import charges:
Your maximum bid:
Your maximum bid:
Please read the full listing. By clicking Confirm bid you commit to buy this item from the seller if you are the winning bidder. You will enter a binding contract.
By clicking Confirm bid, you are committing to buy this item from the seller if you are the winning bidder and have read and agree to the Global Postage Programme terms and conditions - opens in a new window or tab. Import charges previously quoted are subject to change if you increase you maximum bid amount.
Cancel
Loading...
Resume bidding, if the page does not update immediately.
Place bid
Review and confirm your bid
Bid confirmation
d
h
m
s
day
hour
hours
Free P&P
See item description
(Approximately ##1##)
(Enter ##1## or more)
(Enter more than ##1##)
Your maximum bid:
Increase maximum bid
Place bid
Confirm bid
Increase maximum bid
Cancel
Change bid
Close
, you've been outbid. Don't let it get away - bid again.
, you're the highest bidder on this item. Hope you win it.
, you're the first bidder. Hope you win.
, you're currently the high bidder, but you're close to getting outbid.
, this auction is almost over and you're currently the high bidder.
, you're the high bidder, but the reserve price hasn't been met.
Please enter your bid again.
Please enter a valid number as the bid price.
Enter an amount that is equal or greater than the minimum bid required. This can be found under the bid entry box.
Maximum bids can't be lowered once they're submitted.
This seller requires the buyer to have a PayPal account to purchase this item. Get a PayPal account here .
Your bid is greater than or equal to the Buy it now price. We recommend you purchase this item via Buy it now. If you still wish to bid, you may do so below.
Time left:
Current bid:
(approximately ##1##)
Your maximum bid:
(approximately ##1##)
Increase your maximum bid:
By clicking 1 Click Bid, you are agreeing to buy this item from the seller if you're the winning bidder. Learn moreabout 1-click bid - opens in a new window or tab
day
hour
min
sec
days
hours
mins
secs
(approximately ##1##)
Winning bid:
Starting bid:
Close
Congratulations The auction has ended and you're the winner.
The auction has ended, but the reserve price was not met.
Sorry, the auction has ended and you were outbid.
Good news, you're the highest bidder.
Sorry, you've been outbid.
You're the highest bidder, but the reserve price has not been met.
Please enter a higher amount than the current bid.
Maximum bids cannot be lowered once submitted.
Please enter a valid number.