Wednesday, September 06, 2017

Misprint in Quad 99pre manual.

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Misprint in Quad 99pre manual. Several 99pre owners have complained of low volume and dull sound from the phono preamp. We traced this ...
Tuesday, September 05, 2017

An exploration of the practical issues and benefits of two of the Quad 405-1 modifications suggested in Berndt Luwdig's paper on the Quad 405.

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These modifications are not for the inexperienced or those without adequate test equipment, and are not under consideration for inclusion i...
1 comment:
Sunday, April 26, 2015

Bias Stability in a Quad 303

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I had set the bias in my own Quad 303 in 2006 or 2007 with the aid of a high-quality Tektronics AA501 distortion analyzer and oscilloscope....
Saturday, February 28, 2015

Counterfeit Warning 405 boards

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Recently counterfeit Dada Electronics High-end boards have appeared on Tweedehands.be and Marktplaats.nl. Also on eBay . Those boar...
Sunday, October 19, 2014

Input Sensitivity of 'Power' amplifiers, the 306/606 case

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The recent discussion on the forum about the input sensitivity of a Quad 306 and 606 in a Bi Amping application is the reason for this po...
Friday, October 11, 2013

Mono blocking or Bi-Amping

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Monoblocking or Bi-Amping? There are three ways to let the two channels of a stereo amplifier work together to drive a single loudspeak...
6 comments:
Saturday, April 27, 2013

PGA2311 based (remote) volume control

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There was a question on the forum about a remote controlled volume control, the intention was to place it between a Quad 33 and 303. At ...
3 comments:
Wednesday, April 10, 2013

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Dada Electronics has chosen Nigel Grey photograpy as their home-photographer.   The Dada v2 Quad 405 High-end board. (c)
2 comments:
Friday, March 15, 2013

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 Dada proudly announces the new 405 v2 High End boards We used a double sided board with fully metalized holes. We had to do this to...
1 comment:
Saturday, January 12, 2013

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Important news about connecting a DaDa double PSU in a Quad 405 I had some mail conversation with Keith Snook of DC- Daylight about dou...
Wednesday, July 20, 2011

Chinese Quad 405 boards

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On Ebay Chinese boards for the Quad 405 are for sale. We ordered some to try them out. They are based on the first version of the 405 board ...
1 comment:
Friday, May 06, 2011

Fixing Quad 303 boards in the chassis

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We often get the question if we can supply the plastic clips for mounting the Quad 303 driver-boards and power-supply boards in the chassis,...
1 comment:
Thursday, May 05, 2011

BHC Aerovox ALC10C instead of ALP22A in Quad 606-Mk2, 707 and 909

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BHC recommends using the ALC10C capacitors instead of the older ALP22A in new developments. It is less expensive, smaller and it has better ...
1 comment:
Monday, March 14, 2011

405-clone needs service after 30 years...

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Holger (from Germany but now living in Australia) has been using his 405-clone for 30 years but then there was this 18th Birthday-party of h...
1 comment:
Saturday, February 05, 2011

Ivor's Quad 33 revision

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Quad 33 Revision. A beginners tale. I am a professional violinist who also has a small recording studio, and In the past couple of years I h...
1 comment:
Friday, January 07, 2011

Quad 50E and D Upgrade /Revision manual

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DaDa Electronics has published a Upgrade/Revision manual for the Quad 50E and D professional mono amplifiers. Together with the user manual ...
Sunday, December 26, 2010

The best CD4066 switch for a Quad 44 is.........

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Instead of looking for the right 4066, I build a relay solution. The two relays (4 contacts) are placed on a small Pcb, piggybacked on the c...
4 comments:
Saturday, December 18, 2010

What are the best capacitors for Audio?

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The quality of the capacitors, specially when they are in the signal-line, have a very big impact on the sound-quality of an audio-circuit. ...
3 comments:

Quad 66 Revision Kit Design considerations

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We get more and more questions about how the sound quality of the Quad 66 can be improved. The 66 is often used together with the 606 which...
5 comments:
Friday, October 29, 2010

New power supply for the Quad 405 1 and 2

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A new double power supply for the Quad 405 1 or 2 and DIY projects. We developed a new supply with an integrated DC protection for your spea...
3 comments:
Monday, October 25, 2010

One step further: Piotr's 405-project

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Piotr, from Poland, revised his 405 with the Dada-kit ... and some other components: He wrote: Specs: -Dada Electronics basic revision kit o...
4 comments:
Friday, September 03, 2010

Upgrading and Monoblocking a pair of 520f amplifiers.

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By Stefan Vertongen, Belgium. Description of the amplifiers, as bought on the second hand market: -Serial number: 005 095; one amp board wit...
Wednesday, August 25, 2010

Measuring distortion with software

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The case with the “Chinese” Quad 909 was the first occasion we worked with a software based distortion analyzer. I used to work with a Sound...
Sunday, August 08, 2010

Improving a new Quad 909

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One of our French customers, who is working in professional audio, bought a new Quad 909 to drive his Tannoy studio-monitors. He has always...
17 comments: