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Home Forums Product Discussion & Questions BeoGram Beogram 4002/4004 RIAA/Remote control Upgrade :)

Viewing 10 posts - 1 through 10 (of 10 total)
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  • #53157
    Weebyx
    BRONZE Member

    So, I have been away from this site for a looong time now, but I thought I would show you something I have been working on.

    This is a complete replacement for PCB8 for the Beogram 4002 and 4004, which includes a RIAA amplifier, and also makes it possible to control the Beogram via Beolink remote through f.ex Beomaster 4500/6500/7000 and the likes.

    It has the same logic regarding features, as a BG7000, including 2-way functionality, so the Beomaster will turn on and select Phono, if the Beogram is powered on via the keybord 🙂

    What do you guys think ? 🙂

     

     

    12

    #53158
    Mark-sf
    BRONZE Member

    Very clean. How are you deriving the bipolar phono section supplies? I offered a similar mod back in the 1980s (w/o the remote) using a DC-DC converter plug-in module.

    #53159
    Weebyx
    BRONZE Member

    I am running powersupply to opamps via LDO voltage regulators, and actually NOT running dual supply. It is running 0-12v on opamps.

    #53160
    Mjoelnir
    BRONZE Member

    This is a really great restomod! I’ve just auctioned a Beogram 4002 (going to get it today) and plan to upgrade it in this way. Where can I get this upgrade part? Is it easy to install?

    #53161
    Weebyx
    BRONZE Member

    On a 4004, it is 100% plug and play, no soldering or anything. A 4002 is also plug and play, however it needs a new DIN cable, as it is missing pins 6 and 7 for the datalink connections.

    Where do you live ? Currently the only way of getting it, is through me here in Denmark.

    #53162
    Mark-sf
    BRONZE Member

    I suspected as much. I did not choose that route as I wanted the higher head room and direct coupling to avoid caps in the direct signal path,

    #53163
    Weebyx
    BRONZE Member

    My design is build on Texas Instruments Reference RIAA design, they already use caps in direct signal path, even B&O’s own RIAA, and others, dont use dual power 🙂

    I set out to build a RIAA amp that most people finds “good enough”, and up until now, everyone has been very happy with how it sounds.

    I even compared TI’s RIAA curve with this, and they are almost identical.

    But yes, there will always be ways of optimizing RIAA’s, and no 2 sound the same, and on top of that, 2 people listening to the same RIAA, will also always agree.

     

    #53164
    ChristianHak
    BRONZE Member

    Hey mate,

    How much are you selling your RIAA upgrade for?

    Mvh,
    Christian

    #53165
    Mjoelnir
    BRONZE Member

    I am very new to turntables and preamps and everything, and there are so different opinions that it gets complicated and confusing. For example, are vibrations really a problem of internal preamps? I’d prefer not having yet another box, and not spoiling the design of the Beogram.

    #53166
    StanfordBeogram
    BRONZE Member

    This is fantastic – and very well laid out. Would it be possible to design one to work with an independent IR sensor so that it may be solely used as with a Beolink remote?

    Please let me know how I may purchase on of these beautiful boards!

Viewing 10 posts - 1 through 10 (of 10 total)
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