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Thread: Advice on Quad power amps.

  1. #451
    Join Date: Sep 2013

    Location: North Island New Zealand

    Posts: 1,451
    I'm Chris.

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    Quote Originally Posted by Mikeandvan View Post
    Thanks Chris, the 909 was serviced by the last owner back in 2017, wouldn't Quad have ensured enough heatsink compound?
    Hi Mike
    All the images I have seen of the internals of the 909 miss out on having heatsinking compound. If you want a second opinion, maybe
    ask Rob Flain at Quad, but it is common sense IMO and advised here: http://sound.whsites.net/heatsinks.htm#s9 to aid the transfer of heat
    to the external heatsink in every circumstance. If we observe the Quad 405 heatsink bracket it always used heatsink compound. Barry i am sure will
    have an opinion on this too.

  2. #452
    Join Date: Mar 2016

    Location: Brighton, UK.

    Posts: 1,129
    I'm Mike.

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    Anyone use the phono stage on the Croft 25 ? I think my Graham slee era v beats it.
    Current system. NAS Interspace, Jelco 750, /Nagaoka MP 200/Graham Slee Era V. CDP - Mission PCM 7000. Amps - Quad 909/Croft micro 25. Chario Syntar 100 Tower. QED XT40 speaker cable/Straight wire interconnects.

  3. #453
    Join Date: Apr 2011

    Location: cheltenham

    Posts: 573
    I'm matt.

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    Quote Originally Posted by Mikeandvan View Post
    Well, the Croft is here, listened for a few hours, won't make any judgments yet, but its making my 909 very hot, even hotter than the Khozmo did. Somebody mentioned changing a resistor in the Quad, or summut or other! I dunno.
    How you finding the Croft compared to the Khozmo or Little Bear?

  4. #454
    Join Date: Jan 2009

    Location: Essex

    Posts: 21,428
    I'm openingabottleofwine.

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    Quote Originally Posted by Light Dependant Resistor View Post
    Hi Mike
    All the images I have seen of the internals of the 909 miss out on having heatsinking compound. If you want a second opinion, maybe
    ask Rob Flain at Quad, but it is common sense IMO and advised here: http://sound.whsites.net/heatsinks.htm#s9 to aid the transfer of heat
    to the external heatsink in every circumstance. If we observe the Quad 405 heatsink bracket it always used heatsink compound. Barry i am sure will
    have an opinion on this too.
    I have no direct experience of the 909; the amps I use are various 405s and the 500 series (the 510 monoblocks and the 520). I would be very surprised if Quad had not provided adequate heat sinking, including the use of metal oxide silicone grease between the surfaces. It is possible that they use 'dry' insulating washers, as mentioned in the link provided.

    If in doubt have a word with Quad at their service department in Huntingdon: they are very knowledgeable and helpful with enquiries.
    Barry

  5. #455
    Join Date: Mar 2016

    Location: Brighton, UK.

    Posts: 1,129
    I'm Mike.

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    Quote Originally Posted by fatmarley View Post
    How you finding the Croft compared to the Khozmo or Little Bear?
    Hi Matt,
    Haven't had much chance to listen lately, being busy at work. But first impressions are that I was finding the Khozmo passive a bit lean, and not great with more basic rock music. The croft has more body and 'air' to it. Not really sure which I prefer yet, but I will keep the Croft in and may'be change a few valves or something, and concentrate on my sources like TT set up. Oh and of course put the 306 back in when I get around to soldering new speaker sockets in. Actually quite looking forward to trying the 306 again, I think it has more punch than the 909.
    Current system. NAS Interspace, Jelco 750, /Nagaoka MP 200/Graham Slee Era V. CDP - Mission PCM 7000. Amps - Quad 909/Croft micro 25. Chario Syntar 100 Tower. QED XT40 speaker cable/Straight wire interconnects.

  6. #456
    Join Date: Mar 2016

    Location: Brighton, UK.

    Posts: 1,129
    I'm Mike.

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    Quote Originally Posted by Barry View Post
    I have no direct experience of the 909; the amps I use are various 405s and the 500 series (the 510 monoblocks and the 520). I would be very surprised if Quad had not provided adequate heat sinking, including the use of metal oxide silicone grease between the surfaces. It is possible that they use 'dry' insulating washers, as mentioned in the link provided.

    If in doubt have a word with Quad at their service department in Huntingdon: they are very knowledgeable and helpful with enquiries.
    Thanks Barry, I thought the same, it was only serviced 2 years ago.
    Current system. NAS Interspace, Jelco 750, /Nagaoka MP 200/Graham Slee Era V. CDP - Mission PCM 7000. Amps - Quad 909/Croft micro 25. Chario Syntar 100 Tower. QED XT40 speaker cable/Straight wire interconnects.

  7. #457
    Join Date: Apr 2011

    Location: cheltenham

    Posts: 573
    I'm matt.

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    Quote Originally Posted by Mikeandvan View Post
    Hi Matt,
    Haven't had much chance to listen lately, being busy at work. But first impressions are that I was finding the Khozmo passive a bit lean, and not great with more basic rock music. The croft has more body and 'air' to it. Not really sure which I prefer yet, but I will keep the Croft in and may'be change a few valves or something, and concentrate on my sources like TT set up. Oh and of course put the 306 back in when I get around to soldering new speaker sockets in. Actually quite looking forward to trying the 306 again, I think it has more punch than the 909.
    Thanks for the update Mike. Keep us posted...

  8. #458
    Join Date: Mar 2016

    Location: Brighton, UK.

    Posts: 1,129
    I'm Mike.

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    IMG_20190713_230920394_HDR by Mike Van, on Flickr

    To give my 909 more air I moved it to my Ikea shelf, which is pretty solid. Doing so I had to use a longer interconnect (Straight wire chorus) between it and the Croft pre, a 1m rather than a .50m, I then used the 0.50m between the cdp and pre. Just played a cd and it sounded great. Then played a record and it sounded about the same. Improvement in cd playback. Thinking of changing the tonearm on my Notts analogue TT, still haven't got around to trying the 401 I got off here months ago, need to drill a hole in the SME plinth! Gonna try some sort of mains regenerator/conditioner when funds allow. Also really glad the Croft pre I got has single volume control!!
    Last edited by Mikeandvan; 14-07-2019 at 09:29.
    Current system. NAS Interspace, Jelco 750, /Nagaoka MP 200/Graham Slee Era V. CDP - Mission PCM 7000. Amps - Quad 909/Croft micro 25. Chario Syntar 100 Tower. QED XT40 speaker cable/Straight wire interconnects.

  9. #459
    Join Date: Mar 2016

    Location: Brighton, UK.

    Posts: 1,129
    I'm Mike.

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    Now starting to grow tired of the Quad 909 with rock music, as others have said here it just doesn't rock it. It has been lovely in providing some real hifi moments, with real insight and clarity, but now thinking of changing it for something with more punch. I was playing with an old Harmon kardon decentish integrated earlier, and whilst it was a bit rough sounding in comparison it did have more 'air', presence and punch, not a viable amp though, as I said too rough sounding. Of course changing the pre - currently a Croft micro might change things, but not sure how much. I literally cannot play stuff like the Stones anymore, just no life to the music. With other things though its great, just need the hifi sound - which I love - with a bit more punch.
    Current system. NAS Interspace, Jelco 750, /Nagaoka MP 200/Graham Slee Era V. CDP - Mission PCM 7000. Amps - Quad 909/Croft micro 25. Chario Syntar 100 Tower. QED XT40 speaker cable/Straight wire interconnects.

  10. #460
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 10,107
    I'm Oliver.

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    Quote Originally Posted by Mikeandvan View Post
    Now starting to grow tired of the Quad 909 with rock music, as others have said here it just doesn't rock it. It has been lovely in providing some real hifi moments, with real insight and clarity, but now thinking of changing it for something with more punch. I was playing with an old Harmon kardon decentish integrated earlier, and whilst it was a bit rough sounding in comparison it did have more 'air', presence and punch, not a viable amp though, as I said too rough sounding. Of course changing the pre - currently a Croft micro might change things, but not sure how much. I literally cannot play stuff like the Stones anymore, just no life to the music. With other things though its great, just need the hifi sound - which I love - with a bit more punch.
    Buy either a Krell KSA50s or a Neurochrome 286, put a DCB1 Turbo on it and stop messing around and wasting your time.
    Analogue: Technics SP10 MK2 > Phonomac AT-1010 MK6 tonearm > Ortofon Kontrapunkt b > SIMaudio Moon LP5.3RS
    Digital: Orchard Audio PecanPi with JRiver
    Preamplifier: Neurochrome Differential Preamp
    Amplification: Neurochrome Modulus 686
    Speakers: Mordaunt Short Performance 880
    Cables: SPOTFIRE Speaker Cable & SPOTFIRE IC Cables & SPOTFIRE Tonearm cable

    Price List For SPOTFIRE Cables here:https://bit.ly/2Uxiv3j

    Alternative reading: http://www.audioaddictsforum.com

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