Talk:Quad Electroacoustics
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[edit] rewrite of 27 June, 2006
The article's meandering structure and lack of objectivity has been addressed in this rewrite. I did not want to slap a "weasel word" warning on the article. I found the previous version far too glorious in praise for Peter Walker and QUAD products; Description of each product was occasionally too detailed.
Text on products is now in the form of a chronological milestones chart; much of the overdosed praise has been removed. Someone would need to go through this list and ensure that the major milestones are there and correct, and remove those which are only of passing interest.
I feel that "closest to the original source" is more of a mission statement, and I would suggest that someone added an overview of how this translated into the design philosophy behind each category of product to make the article more relevant and interesting. It may have existed in the previous version, but this did not come across at all.
Although QUAD was clearly a pioneer in UK ampifier circles, it has largely lost the leadership to more modern UK and US competitors. Its role is therefore strictly historical. Cost at launch of a product is meaningless without comparisons; the type of valve used is of dubious interest to anyone except the most fanatical tube enthusiast. I also removed the paragraphs dealing with the amplifier naming convention, as this would be of minor or no interest to those who merely wanted to learn about the company and its landmark products.
Its reputation today is associted with the ESL, thus I added a refernce to QUAD being synonymous with the electrostatic LS accordingly. It is only my personal perception. Notwithstanding, I felt it more appropriate to leave the detailed descriptions and strengths and weaknesses of the electrostatic design to the page about Electrostatic loudspeakers. Ohconfucius 07:29, 28 June 2006 (UTC)
[edit] VFD tag
Someone put a VFD tag on this page at the same time as I moved it here from Quad (audio). I'm not sure quite how to resolve this. Sorry if I've trodden on anyone's toes. Spliced 16:49, 12 August 2005 (UTC)
[edit] QUAD
There is a duplicate article QUAD that should be merged here. I have tagged and listed these. QQ 02:34, 18 December 2005 (UTC)
[edit] This is incorrect
"The rough capability of the amplifier can be seen in the names. For instance, the 303 uses a 30V power supply and can supply 3A. The 405 uses 40V and can supply 5A etc."
The 303 is a single ended arranged regulated power supply amplifier with rail voltage at 67v its midway voltage namely the junction of upper and lower transistor triples is approximately 33v.
The 405 uses a 35VAC Dual rail supply resulting in approx 52v DC negative and 52vDc positive rails
The real reason for naming of the amplifiers ,I am currently researching and will report back here 61.68.169.28 14:28, 17 February 2006 (UTC)
I have received a reply from Quad themselves which states The 303 amplifier was named 303 as it produces 30 volts peak 3A output. The 405 amplifier was named 405 as it produces 40 volts peak 5A output. The Quad II was just the next number on from the Quad I.
The way the existing text reads there is confusion that a DC power supply voltage is part of the naming - hence my raising of this question, when it is in fact the peak AC voltage value developed expressing the maximum voltage attainable from the output devices and including a current rating. - as such I am posting a correction.61.68.171.131 13:00, 22 February 2006 (UTC)
[edit] Corrected distortion measurements Quad 405
I posted a correction to Quad 405 distortion measurements.
Although text concerning amplifier description is just there,- it needs a bit of tarting up - mention should be made of the 405 circuit using a bridge configuration solved by the equation
- "Z1/Z2 = Z3/Z4 where Z4 was a sensing resistor. P.J. Walker's
unique contribution to this thought was that this equation held very usefully if you made Z3 and Z4 reactances instead of resistors." quotation interview with Mike Albinson designer. http://www.quadesl.org/Album/InterviewsReviews/MikeAlbinson/mikealbinson.html
Mention should be made of conduction classes ie it is a Class C amplifier - output dumpers ( Transistors ) controlled by a Class A amplifier fed initially in the case of the 405 by a inverting op amp 61.68.169.28 14:57, 17 February 2006 (UTC)
