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Thread: Low Volume from Dual Turntable (via preamp) with Cambridge Audio Amp

  1. #21
    Join Date: Feb 2013

    Location: W Lothian

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    I'm Grant.

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    could be amp then... worth trying another if you can borrow one..
    Regards,
    Grant ....

    I've said it before and I'll say it again: democracy simply-doesn't-work
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  2. #22
    Join Date: May 2018

    Location: Ireland

    Posts: 29
    I'm Stephen.

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    Thanks again Grant, it's unlikely I can find one on my Island(!) but I've got my eye on a new Marantz PM5005, good deal on Amazon right now - 55 less than I could get it from a Dublin dealer, even with postage costs. Is that a good match for the Dual 505 (assuming it's OK).

  3. #23
    Join Date: Feb 2013

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    I'm Grant.

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    dont know much re the dual 505 tbh. more of a point will be the phono stage. decent one with a decent gain structure might be a need too, although the at95 is a bottom end cart it can sound pretty decent with a good phono stage. also what are your speakers
    Regards,
    Grant ....

    I've said it before and I'll say it again: democracy simply-doesn't-work
    .... ..... ...... ...... ................... ..... ..... ..... ..... .....
    OPPO BDP-103D DARBEE - JBE SERIES 3/M55E/EMOTIVA XPS1 - TWIN PRO MONOBLOCK AMPLIFIERS - XIANG SHENG DAC\PRE\HEADPHONE AMP - TWIN AVANTREE OASIS CLASS 1 BLUETOOTHS - AUDIO TECHNICA ATH-MSR7 & OPPO PM-3 PLANAR HEADPHONES - WIN10 JRIVER24, DEEZER HiFi - SMSL M6 MINIDAC - RPI/AUDIOPHONICS - FULL RANGE TWIN TELEFUNKEN/Q ACOUSTIC BT3/CANTON SUB - P.INSPIRED MAINS REGENERATED.

  4. #24
    Join Date: Jan 2009

    Location: Essex

    Posts: 17,419
    I'm openingabottleofwine.

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    The hum could be caused by having the cartridge return leads (the blue and green coloured leads) swapped around. They may be correctly connected on the cartridge pins but could be incorrect within the headshell. It happened to me once.
    Have you listened to this month's choice in the Album Club?

    Barry

  5. #25
    Join Date: May 2018

    Location: Ireland

    Posts: 29
    I'm Stephen.

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    Quote Originally Posted by struth View Post
    dont know much re the dual 505 tbh. more of a point will be the phono stage. decent one with a decent gain structure might be a need too, although the at95 is a bottom end cart it can sound pretty decent with a good phono stage. also what are your speakers
    Speakers are Monitor Audio Bronze B2. Preamps are Behringer PP400 (47Kw) and NAD PP2 (47 kohms + 200 pf).

  6. #26
    Join Date: May 2018

    Location: Ireland

    Posts: 29
    I'm Stephen.

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    Quote Originally Posted by Barry View Post
    The hum could be caused by having the cartridge return leads (the blue and green coloured leads) swapped around. They may be correctly connected on the cartridge pins but could be incorrect within the headshell. It happened to me once.
    Thanks Barry. The hum is there even with the CD connected, or with nothing other than the speakers connected, and at about slightly more than halfway up on the volume dial.

  7. #27
    Join Date: Jan 2009

    Location: Essex

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    I'm openingabottleofwine.

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    Quote Originally Posted by Valentiaman View Post
    Thanks Barry. The hum is there even with the CD connected, or with nothing other than the speakers connected, and at about slightly more than halfway up on the volume dial.
    Then it sound like the problem is with the amplifier. If you only have a CD player connected but not playing, is the hum there with the volume set half way?
    Have you listened to this month's choice in the Album Club?

    Barry

  8. #28
    Join Date: Aug 2009

    Location: Staffordshire, England

    Posts: 20,206
    I'm Martin.

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    Perfectly normal to have to wind the volume up quite a bit more with vinyl. Phono stages don't tend to have as high an output voltage as a CD player. The hum sounds like it could be a ground loop. Alongside the phono cables running out of the TT you should have an earth lead. That needs to be connected to the phono stage. If it is already connected try disconnecting it.
    Martin



    Current Lash Up:

    Technics SL1200P CD Player * NVA P90SA passive pre / Krell KSA50S Power amp * JM Lab Electra 926 loudspeakers *



    'The best I advice I ever received was to always remember that no-one else has any idea what they are doing either.'

  9. #29
    Join Date: Jan 2012

    Location: Glasgow, UK

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    I'm Tony.

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    Quote Originally Posted by Valentiaman View Post
    Thanks Barry. The hum is there even with the CD connected, or with nothing other than the speakers connected, and at about slightly more than halfway up on the volume dial.
    Sounds like an earth issue, try moving the phono stages away from the amp or TT or TV etc.

    I had a similar problem with my current cartridge and previous amp, records were quiet at the same volume setting as the other line stages (tuner, CD etc) so I had to crank the amp's volume up to about almost full when listening to records but obviously had to remember to turn the volume down if I listened to another source I then changed the amp and bought an on-board MM module for the amp and now the same cartridge plays at the same volume level as all of the other line stages.

  10. #30
    Join Date: Aug 2009

    Location: Staffordshire, England

    Posts: 20,206
    I'm Martin.

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    Quote Originally Posted by Valentiaman View Post
    Thanks Barry. The hum is there even with the CD connected, or with nothing other than the speakers connected, and at about slightly more than halfway up on the volume dial.
    That sounds like the amp. If the hum is always the same level regardless of the volume it is the transformer. If that's the case you'll need a new amplifier, repairing it won't be cost effective unless you can do it yourself.
    Martin



    Current Lash Up:

    Technics SL1200P CD Player * NVA P90SA passive pre / Krell KSA50S Power amp * JM Lab Electra 926 loudspeakers *



    'The best I advice I ever received was to always remember that no-one else has any idea what they are doing either.'

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