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Thread: FS: Quad 405-2 Monoblocks

  1. #1
    Join Date: Sep 2014

    Location: Northern Ireland

    Posts: 559
    I'm John.

    Default FS: Quad 405-2 Monoblocks

    Bought these recently from Ian Walker here on AoS.

    Here's a link to the original sale thread as there's some additional info here.

    http://theartofsound.net/forum/showt...highlight=quad

    These are amplifiers that walk the line of detail, musicality and coherence with aplomb.

    For me their biggest strength is their voicing; they don't spotlight any frequency but present music in an unforced, natural and realistic fashion which makes a lot of other presentations sound false. They truly get out of the way and let the music do the talking.

    I've copied Ian's photos of the internals (hope you don't mind Ian). The externals are servicable but obviously not where their beauty lies.

    These were a last throw of the dice for me with regard to solid state amps for the Lockwoods but my speakers just don't give their best with SS which is a shame as it would save a lot of hassle with valves but there you go. For what it's worth I enjoyed these more than the big money pre-powers I tried as they just gave you the music instead of the hifi but at the same time offered all the separation and clarity of anything else but just in truly coherent fashion. They are a time machine type of amp, hours can pass by easily.

    Just looking to recoup costs so 600 collected or 650 including insured, next day delivery.

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  2. #2
    Join Date: Sep 2014

    Location: Northern Ireland

    Posts: 559
    I'm John.

    Default

    Bit more technical info on the mods done.

    "All the work done on these was carried out by Duncan (Tubehunter).Rebuilt to exactly the same spec as his (now Barry's), these have been upgraded with four F&T 22,000 power supply capacitors, four 35 amp bridge rectifiers one per rail. RCA Phono connectors and power switch fitted.
    There is one 405 mk2 board in each case, which is up to Keith Snook's Mod 3 level. Including 20A output transistors, PRP 1% resistors through out with Z-foils in key areas, OPA604AP Op-amps, new inductors, transistors polystyrene small value caps and Elna Cerefine capacitors. Limiters have been removed and Vellaman K4700 loudspeaker protection boards fitted."

  3. #3
    Join Date: Sep 2014

    Location: Northern Ireland

    Posts: 559
    I'm John.

    Default

    Some more discussion on this thread:

    http://theartofsound.net/forum/showt...405-amplifiers

  4. #4
    Join Date: Aug 2011

    Location: Coventry, England UK

    Posts: 354
    I'm Simon.

    Default

    These look interesting. Does anyone know how they'd fare against my current Arcam P1's? What about the input impedance for when using a passive?

  5. #5
    Join Date: Sep 2014

    Location: Northern Ireland

    Posts: 559
    I'm John.

    Default

    Quote Originally Posted by Simon_LDT View Post
    These look interesting. Does anyone know how they'd fare against my current Arcam P1's? What about the input impedance for when using a passive?
    Hi Simon, never heard Arcam P1s so can't comment on a comparison.

    Both Ian and myself used the Quads with passive preamps and they worked perfectly. Not sure what the input impedance is but AFAIK they are the standard input sensitivity for a 405-2 which is 0.5Vrms for full output.

  6. #6
    Join Date: Aug 2011

    Location: Coventry, England UK

    Posts: 354
    I'm Simon.

    Default

    Thanks for the reply John. Did some quick research and seems the Snook 3 board has 220kohm impedance if I've read it right so that is good. I'm tempted for sure but not sure if it'll be more of a lateral move.

  7. #7
    Join Date: Sep 2014

    Location: Northern Ireland

    Posts: 559
    I'm John.

    Default

    Quote Originally Posted by Simon_LDT View Post
    Did some quick research and seems the Snook 3 board has 220kohm impedance if I've read it right so that is good. I'm tempted for sure but not sure if it'll be more of a lateral move.
    That's interesting, thanks for the info Simon. Should definitely be OK for passives preamps then. Certainly worked fine for me.

    I understand your dilemma, we're all in the same boat, it's virtually impossible to hear any used equipment in your own system before buying.

  8. #8
    Join Date: Jan 2009

    Location: Essex

    Posts: 15,277
    I'm openingabottleofwine.

    Default

    I have a pair of Duncan's 'monoblocked' 405s. They are excellent: I demo'ed them at MiBO last year to good effect.

    Shame they haven't worked out for you John, but good luck with the sale.
    Have you listened to this month's choice in the Album Club?

    Barry

  9. #9
    Join Date: Sep 2014

    Location: Northern Ireland

    Posts: 559
    I'm John.

    Default

    Quote Originally Posted by Barry View Post
    I have a pair of Duncan's 'monoblocked' 405s. They are excellent: I demo'ed them at MiBO last year to good effect.

    Shame they haven't worked out for you John, but good luck with the sale.
    Thanks Barry. They really are excellent amps, solid articles too. Always remind me of a concrete block when I lift them up Bargain for someone.

    Bump!

  10. #10
    Join Date: Sep 2014

    Location: Northern Ireland

    Posts: 559
    I'm John.

    Default

    Another bump for a great pair of 100w monoblocks.

    Must be good for someone, a lot of performance for the money.

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