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Thread: Quick check - Airlink BMU - which one?

  1. #31
    Join Date: Jan 2009

    Location: Norwich

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    I'm Hugo.

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    I have a 2kW Airlink BMU and it offers a considerable improvement in tone/texture/detail etc, but it did somewhat 'go off' after a while. Out of curiosity I replaced the SL32 surge-limiting thermistor (the big black disc thing) with a new, identical component and the magic came back, in an instant. So, this leads me to suspect that these BMUs are probably better off with a proper 'slow start' circuit, such as the one that Sjostrom Audio sell as a bare PCB, to limit inrush current, rather than a thermistor. Sadly, there is no room in the case of my Airlink BMU for that circuit.
    Last edited by Ammonite Acoustics; 19-02-2018 at 12:25.

  2. #32
    Join Date: Jan 2009

    Location: Sheffield - UK

    Posts: 6,071
    I'm Mark.

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    Quote Originally Posted by Bigman80 View Post
    Do tell
    Sorry, only just seen your response. Well, it’s just that even at 3000Va I’m not sure it doesn’t quash dynamic swing a bit. I’ve diacussed this with Hugo before (Ammonite Acoustics) and he puts it down to the thermistor but I’ve not had time to experiment.

    100% Analogue

  3. #33
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 6,226
    I'm Oliver.

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    Quote Originally Posted by YNWaN View Post
    Sorry, only just seen your response. Well, itís just that even at 3000Va Iím not sure it doesnít quash dynamic swing a bit. Iíve diacussed this with Hugo before (Ammonite Acoustics) and he puts it down to the thermistor but Iíve not had time to experiment.
    Hmmm, not had any issues with mine at 750va.

    Hasn't got rid of the noise the powerline adapters are producing though.
    Analogue: Technics SP10 MK2 > Phonomac AT-1010 MK5 tonearm > Ortofon Kontrapunkt b > Bigbottle Jfet MC Valve Phonostage (Telefunken & Tesla Valves)
    Digital: NONE
    Amplification: Nelson Pass DCB1 & Monarchy Audio SM-70 Class A Amplifier
    Cables: Fisual S-Flex Speaker Cable & SPOTFIRE IC Cables & NEW SPOTFIRE Tonearm cable
    Speakers: Pioneer CS-77A

  4. #34
    Join Date: Jan 2009

    Location: Sheffield - UK

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    Quote Originally Posted by Bigman80 View Post
    Hmmm, not had any issues with mine at 750va.
    But are you sure...... .. .

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  5. #35
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 6,226
    I'm Oliver.

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    Quote Originally Posted by YNWaN View Post
    But are you sure...... .. .
    Yes. I took it back out this morning and put a homemade multiblock in instead. Lost the clean lines very slightly and felt everything was little less defined as a result. Put it back in and instantly improved.
    Analogue: Technics SP10 MK2 > Phonomac AT-1010 MK5 tonearm > Ortofon Kontrapunkt b > Bigbottle Jfet MC Valve Phonostage (Telefunken & Tesla Valves)
    Digital: NONE
    Amplification: Nelson Pass DCB1 & Monarchy Audio SM-70 Class A Amplifier
    Cables: Fisual S-Flex Speaker Cable & SPOTFIRE IC Cables & NEW SPOTFIRE Tonearm cable
    Speakers: Pioneer CS-77A

  6. #36
    Join Date: Jan 2009

    Location: Sheffield - UK

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    I'm Mark.

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    My issue could also be down to running my power amps through the BMU (although it should, in theory, easily be big enough to cope).

    100% Analogue

  7. #37
    Join Date: Jan 2009

    Location: Sheffield - UK

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    Quote Originally Posted by Bigman80 View Post
    Yes. I took it back out this morning and put a homemade multiblock in instead. Lost the clean lines very slightly and felt everything was little less defined as a result. Put it back in and instantly improved.
    That’s a very good description of what it does improve - I’m not saying it isn’t without benefit, just that it isn’t also without some compromise...

    100% Analogue

  8. #38
    Join Date: Nov 2015

    Location: Wolverhampton

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    I'm Oliver.

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    Quote Originally Posted by YNWaN View Post
    Thatís a very good description of what it does improve - Iím not saying it isnít without benefit, just that it isnít also without some compromise...
    True, as with all things mate. Nothing is perfect.
    Analogue: Technics SP10 MK2 > Phonomac AT-1010 MK5 tonearm > Ortofon Kontrapunkt b > Bigbottle Jfet MC Valve Phonostage (Telefunken & Tesla Valves)
    Digital: NONE
    Amplification: Nelson Pass DCB1 & Monarchy Audio SM-70 Class A Amplifier
    Cables: Fisual S-Flex Speaker Cable & SPOTFIRE IC Cables & NEW SPOTFIRE Tonearm cable
    Speakers: Pioneer CS-77A

  9. #39
    Join Date: Jan 2009

    Location: Sheffield - UK

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    It could also be down to having my power amps connected, or to Hugo’s suggestion - or to a combo of both.

    100% Analogue

  10. #40
    Join Date: Nov 2015

    Location: Wolverhampton

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    I'm Oliver.

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    Quote Originally Posted by YNWaN View Post
    It could also be down to having my power amps connected, or to Hugoís suggestion - or to a combo of both.
    Could be, I do have everything plugged into the BMU regardless of the fact people recommend plugging the Amps directly into the wall. Just seems better that way to me.
    Analogue: Technics SP10 MK2 > Phonomac AT-1010 MK5 tonearm > Ortofon Kontrapunkt b > Bigbottle Jfet MC Valve Phonostage (Telefunken & Tesla Valves)
    Digital: NONE
    Amplification: Nelson Pass DCB1 & Monarchy Audio SM-70 Class A Amplifier
    Cables: Fisual S-Flex Speaker Cable & SPOTFIRE IC Cables & NEW SPOTFIRE Tonearm cable
    Speakers: Pioneer CS-77A

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