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Thread: Nobsound 300b Monoblocks - HELP NEEDED!

  1. #11
    Join Date: Apr 2012

    Location: London

    Posts: 679
    I'm James.

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    What do Douk Audio say? They used to be very responsive (but several years ago was the last time I had reason). They're good 'uns in my book..

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  2. #12
    Join Date: Nov 2010

    Location: Yorkshire

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    I'm Andrew.

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    Sent message, still waiting.
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  3. #13
    Join Date: Mar 2017

    Location: Seaford UK

    Posts: 1,811
    I'm Dennis.

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    Quote Originally Posted by Wakefield Turntables View Post
    I've powered one amp up (altough this phenomen happens with both units) and just attached the speaker cable from the speaker to the amp. No other cables. I've just tried powering up from the wall socket and still same old hum, I thought it might be the extension I was using.I'm not sure what I/P means Dennis.
    I'm sorry, I/P is standard for input in telecoms. Short the input to make sure no hum voltage is going into the amps, driving them.

  4. #14
    Join Date: Jun 2015

    Location: London/Durham

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    I'm Lawrence.

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    To be clear you mean connect the + and - inputs together on each mono amp?

  5. #15
    Join Date: Apr 2012

    Location: London

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    I'm James.

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    He means short out the signal input. Easiest way is to stick an interconnect cable into it and short out the other end with a paper clip or something conducting. If the hum ceases, that's a good start. If not back to the hunt.

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  6. #16
    Join Date: Mar 2017

    Location: Seaford UK

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    I'm Dennis.

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    Yes, on each amp connect the + and - together, thus ensuring no input voltage is fed into each amp.

    Eliminating this, if the hum persists, it is inherent to the amp circuitry.

  7. #17
    Join Date: Jun 2015

    Location: London/Durham

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    I'm Lawrence.

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    I'm sure I've had amps before that hum if there's no input, doesn't the input provide a ground that might get rid of the hum? Plug in a pre (also plugged into the mains and switched on before powering these up) and see what the hum is like them.

  8. #18
    Join Date: Apr 2012

    Location: Southall, West London

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    I'm Geoff.

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    Perhaps there's a mains related issue. Trying a DC blocker might be useful.
    Conspiracy theories are only perpetuated because people go looking for them!

  9. #19
    Join Date: Mar 2017

    Location: West Sūžsēaxe

    Posts: 1,971
    I'm Edward.

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    I wonder if having the amp so close to the (IMF) speaker is part of the problem?

    Do I see a PS Audio powerplant in the background? Try that. If you have a DC issue the conditioner should cure it.

    But yeah having a source connected to the input seems the obvious first step to try.

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  10. #20
    Join Date: Nov 2010

    Location: Yorkshire

    Posts: 8,679
    I'm Andrew.

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    Right I've had a few beers so I'll try all your recommendations tomorrow chaps. Can I say thanks for the input.
    SS
    CD Teac VRDS25X(Audiotuned) DAC Caiman SEG+15V PSU+Dorado DECK 1210 Mat Crystal Audio Mods MN Base/Bearing/Platter+Ebony armboard Feet Isonoe/Ebony PSU Paul Hynes SR7EHD-27XL/DCSXL Ag DC lead/3 Stage Regs/Recap PCB+No Pitch/Strobe/Light ARM SME V(Kondo Ag Rewire&Tags) MC Cadenza Black FGS CABLES Arm Yannis SPD-4 IC Yannis 222 Litz+Ag bullets Power WAR PRE ATC SCA2 SPEAKERS ATC 50ASL STANDS Atacama PHONO Sugden Masterclass PA4 SUT Ortofon ST80SE POWER PSAudio P10

    VALVE
    PRE
    Croft Epoch(Modified) AMP Sondex S100 (Modified) SPEAKERS Tannoy 15"MG+RFC Warwick cabs+ Reference XO DECKS Garrard301/401 (Bastin) Mat Teunto Bearings 301/401(Bastin) Plinth Moldovan/Bastin Arms 3009/3012(Ikeda Ag wired) SME V 12 PSU Eagle+Tachometer MC Ag Meister v2 / Royall N SPU's CABLES Arm Yannis 420.5 Litz+ Speaker 10mm Cu + WBT-0681 Ag IC Oyaide FTVS-510 AgWBT 0110Ag Phonostage Paradise(4 Box Modded) / EAR 834 Clone (modded)

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