Quad 405 mod

kaj2 · 6th February 2005, 11:19 PM

hi

Does anybody here have experience wiht this company: http://www.net-audio.co.uk/index.html
and in particualy whith there Quad 405 modifications

greatings kaj

Graham Maynard · 7th February 2005, 09:34 PM

Hi kaj2,

I am sure you cannot do anything wrong by fitting fresh/modern capacitors and a new IC, but further improvements are possible relating to output devices and current limits on older boards.

Cheers ......... Graham.

trydecaf · 8th February 2005, 08:50 PM

netaudio got a great review for their Quad 303 mods in the February review of hifi world, if that helps you...

James

Graham Maynard · 9th February 2005, 06:23 AM

Hi kaj2

Try searching for

Amplification for Quads - Fifth Edition.

Cheers ........... Graham.

kaj2 · 11th February 2005, 07:51 PM

Thank you all for your help.
I think i go for the modification

Kaj

Blue · 5th March 2005, 12:17 PM

KAJ2:

There's more to modify on a QUAD 405 than simply fitting overpriced capacitors....

http://www.dc-daylight.ltd.uk/Valve-...-405-Mods.html

Never fit a bipolar capacitor when there is a dc voltage across it !

BLUE

analog_sa · 5th March 2005, 08:24 PM

Quote:

Never fit a bipolar capacitor when there is a dc voltage across it !

Why?

Blue · 5th March 2005, 10:10 PM

Will the real JC please stand up... please stand up

With over 1500 postings and a handle like analog-SA do YOU really want to know the answer ??

In short, when you dc bias a bipolar you won't half get a good capacitor, in fact you will.

BLUE

"There are an infinite number of octaves between dc and 20Hz but less than 10 between 20Hz and 20kHz"

tvicol · 9th March 2005, 11:00 AM

Hello everyone !!!

This is my first post on this forum.

I would like to share my QUAD 405 modifications, which are based on 707 schematic and Keth Snook input mod. http://www.dc-daylight.ltd.uk/Valve-...-405-Mods.html

tvicol · 9th March 2005, 11:36 AM

Ups ! Seems that I can not attach files

6th February 2005, 11:19 PM	#1
kaj2 diyAudio Member Join Date: Oct 2004 Location: Copenhagen	Quad 405 mod hi Does anybody here have experience wiht this company: http://www.net-audio.co.uk/index.html and in particualy whith there Quad 405 modifications greatings kaj

5th March 2005, 10:10 PM	#8
Blue diyAudio Member Join Date: Nov 2004 Location: Grand Cayman	Caps off Will the real JC please stand up... please stand up With over 1500 postings and a handle like analog-SA do YOU really want to know the answer ?? In short, when you dc bias a bipolar you won't half get a good capacitor, in fact you will. BLUE "There are an infinite number of octaves between dc and 20Hz but less than 10 between 20Hz and 20kHz"

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7th February 2005, 09:34 PM	#2
Graham Maynard diyAudio Member Join Date: Dec 2003 Location: UK	Hi kaj2, I am sure you cannot do anything wrong by fitting fresh/modern capacitors and a new IC, but further improvements are possible relating to output devices and current limits on older boards. Cheers ......... Graham.

8th February 2005, 08:50 PM	#3
trydecaf diyAudio Member Join Date: Feb 2005 Location: Southern England	netaudio got a great review for their Quad 303 mods in the February review of hifi world, if that helps you... James

9th February 2005, 06:23 AM	#4
Graham Maynard diyAudio Member Join Date: Dec 2003 Location: UK	Hi kaj2 Try searching for Amplification for Quads - Fifth Edition. Cheers ........... Graham.

11th February 2005, 07:51 PM	#5
kaj2 diyAudio Member Join Date: Oct 2004 Location: Copenhagen	Thank you all for your help. I think i go for the modification Kaj

5th March 2005, 12:17 PM	#6
Blue diyAudio Member Join Date: Nov 2004 Location: Grand Cayman	KAJ2: There's more to modify on a QUAD 405 than simply fitting overpriced capacitors.... http://www.dc-daylight.ltd.uk/Valve-...-405-Mods.html Never fit a bipolar capacitor when there is a dc voltage across it ! BLUE

9th March 2005, 11:00 AM	#9
tvicol diyAudio Member Join Date: Jan 2005 Location: Bucharest	Hello everyone !!! This is my first post on this forum. I would like to share my QUAD 405 modifications, which are based on 707 schematic and Keth Snook input mod. http://www.dc-daylight.ltd.uk/Valve-...-405-Mods.html

9th March 2005, 11:36 AM	#10
tvicol diyAudio Member Join Date: Jan 2005 Location: Bucharest	Ups ! Seems that I can not attach files

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