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Thread: Battery Powered Caimanised 7520.

  1. #1
    Join Date: Apr 2009

    Location: Sheffield

    Posts: 2,027
    I'm Confused.

    Smile Battery Powered Caimanised 7520.

    Hi Guys,
    I'll start this post by saying that I asked Stan's opinion on this a few days ago and he advised me not to proceed as he had received reports that there was no benefit to be had (or something like that , - I forget the exact words).
    Nontheless, me being me, and armed with my new found soldering skills , I went ahead anyway. and Stan provide the information on the plug/jack that I needed.
    A few months ago I had my burglar alarm serviced and the technician doing it suggested I fit a new battery as the present one had been there since installation, 15 years ago. It is a small sealed lead acid one and my Maplin's multimeter indicated an output of 13.5v across the terminals.
    So this morning I constructed a short lead with small crocodile clips on one end and the necessary jack plug on the other, plugged it in and switched on - I got two blue LEDs so, result .
    I then briefly listened to a few moments of music from the PC (yes, it worked - another result ) and based only on these few seconds, it sounded great - certainly no worse. I will give it a longer listen tonight and report back tomorrow.
    Meanwhile, has anyone else done anything similar and, if so, what results did you get?
    Cheers,
    DaveK.

    My System:
    Power: Belkin PF40, Custom.hifi.cables Hydra and DC PSUs.
    Sources: Self built HTPC with Xonar ST sound card, NAD T585 multi disc player, Sony BDP-S350, Squeezebox Touch, Techncs SL1210 (mod'd) + Nagaoka MP30, Thomson Sky HD box.
    Amps etc.: 2 x Mini-T amps, MF-X10D Valve buffer clone, StanDAC 7520/Caiman (mod'd).
    Speakers: Mission 774s with added super tweeters
    Cables: best I can afford and likely to change except Homar's RF attenuated co-ax's and Mark Grant USB and HDMI cables. I also like silver i/cs and speaker cable.

  2. #2
    Join Date: May 2008

    Location: A Strangely Isolated Place in Suffolk with far away trains passing by...

    Posts: 14,554
    I'm David.

    Default

    Am I right in saying that some battery supplies give HF noise on the line?

    There's nothing wrong with a wall-wart as long as it gives the correct voltage and current requirements and has a "clean" DC output. I understand that someone once "hid" a cheapish Maplin power supply in a Naim box and people listening didn't hear a significant difference between this and a HiCap.......
    Tear down these walls; Cut the ties that held me
    Crying out at the top of my voice; Tell me now if you can hear me

  3. #3
    Join Date: Oct 2008

    Location: Aughton, Ormskirk

    Posts: 2,809
    I'm Jerry.

    Default

    I tried this with a 7510 and didn't find any improvement Dave. At least you havent wasted any money.
    Jerry
    Hifi: IPL transmission line floorstanding speakers, Squeezebox Touch, Soncoz SGD1 DAC, DCB1 Pre-amplifier, Croft Series 7 power amp.
    Custom Hifi cables HA10SE headphone amplifier and Hifiman HE-400 headphones.
    AV system: LG 55B7, Denon AVR -x2300w receiver, Quad 12L (front) 11c Centre and 11L rear . Velodyne DD15 subwoofer.

  4. #4
    Join Date: Apr 2009

    Location: Sheffield

    Posts: 2,027
    I'm Confused.

    Default

    Quote Originally Posted by Covenant View Post
    I tried this with a 7510 and didn't find any improvement Dave. At least you havent wasted any money.
    Hi Jerry,
    Having listened for an hour or so tonight to the battery powered output, I have to agree with you. On the other hand, I don't think it was any worse either - I couldn't discern any difference.
    Cheers,
    DaveK.

    My System:
    Power: Belkin PF40, Custom.hifi.cables Hydra and DC PSUs.
    Sources: Self built HTPC with Xonar ST sound card, NAD T585 multi disc player, Sony BDP-S350, Squeezebox Touch, Techncs SL1210 (mod'd) + Nagaoka MP30, Thomson Sky HD box.
    Amps etc.: 2 x Mini-T amps, MF-X10D Valve buffer clone, StanDAC 7520/Caiman (mod'd).
    Speakers: Mission 774s with added super tweeters
    Cables: best I can afford and likely to change except Homar's RF attenuated co-ax's and Mark Grant USB and HDMI cables. I also like silver i/cs and speaker cable.

  5. #5
    Join Date: May 2008

    Location: A Strangely Isolated Place in Suffolk with far away trains passing by...

    Posts: 14,554
    I'm David.

    Default

    Then that means that these DAC's are properly designed - IMO of course...
    Tear down these walls; Cut the ties that held me
    Crying out at the top of my voice; Tell me now if you can hear me

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