QUAD 606 MKII vs 405 MK-I - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 29th December 2012, 05:53 PM   #1
gilwe is offline gilwe  United States
diyAudio Member
Join Date: Nov 2007
Default QUAD 606 MKII vs 405 MK-I

I'm considering getting a Quad 606 (second version). Currently using a 405 (first version) which I love... I wonder how much improvement I am going to hear with the 606 (if at all)...

Is anyone able to tell ?
  Reply With Quote
Old 31st December 2012, 06:41 PM   #2
gilwe is offline gilwe  United States
diyAudio Member
Join Date: Nov 2007
anyone ?
  Reply With Quote
Old 31st December 2012, 06:53 PM   #3
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
Mooly's Avatar
Join Date: Sep 2007
The only to know for sure is to listen in the same system.

I'd love to say no difference as both can be said to be designed to the original Quad saying of "a piece of wire with gain", however that can't possible be true as the original 405's used the LM301A opamp as an input stage. The 606 is all discrete and of simpler design with 3 pairs of output devices per channel.

So there will be very audible differences... but which you prefer... is up to you.
  Reply With Quote
Old 31st December 2012, 06:56 PM   #4
sreten is offline sreten  United Kingdom
diyAudio Member RIP
Join Date: Nov 2003
Location: Brighton UK

I'd generally say unless you go from a mismatch to a good match,
amplifier "upgrades" are a big disappointment, unless their really
is a very large gulf in the two amplifiers performance and price.

rgds, sreten.
  Reply With Quote
Old 31st December 2012, 09:36 PM   #5
Jozua is offline Jozua  South Africa
diyAudio Member
Join Date: Aug 2003
Location: Cape Town

I used to have a Quad 405 Mk1 that was upgraded to a 405 Mk2 with a Quad 44 pre-amp.
I could not pick up a major difference between the two Quad versions but when I hooked up a loan Krell KSA 100 mk 1 to the 44 there was a day and night difference. Regardless how loyal I was to the Quad brand - the hard reality was a speedy divorce with the Quad equipment.


  Reply With Quote
Old 31st December 2012, 10:13 PM   #6
diyAudio Member
Join Date: Apr 2010
Location: Coffs Harbour
I've listened to most Quads at home but not all with identical equipment. Mooly's comment on the LM301 IC in the 405/1 is relevant because it is noisy in comparison to later 405/2, 606 and 306 (similar discrete designs) - See Keith Snook's site for sensible technical comments and solutions to Quad 405 issues.
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
QUAD 606 MKI ClassA Solid State 1 14th June 2012 01:39 PM
how to bridge a Quad 606? moray james Solid State 5 15th December 2007 02:12 AM
Quad 405 Mk 1 bulgin Solid State 14 25th June 2006 06:51 PM
Help with understanding the Quad 606 405man Parts 2 28th January 2006 03:38 PM

New To Site? Need Help?

All times are GMT. The time now is 10:53 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2