Three generations of link-system

  • This topic has 32 replies, 3 voices, and was last updated 2 months ago by Guy.
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  • #9107
    Guy
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    • Warwickshire, UK
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    How can I find out if the RIAA is already fitted?

    Not at all sure! I would hope that it is written on the label. The part number of the RIAA was 8001245.

    You could test it with your BG9500. If not fitted then it would simply be very low level sound.

    Or you could open it up and look for the small RIAA board which is plugged into the pre-amp PCB – I am not sure exactly where.  Perhaps someone esle on the forum knows!

    As an aside, I just found this FB post from earlier this year making reference to a chap called Søren Claudius who makes a retro fit RIAA module – he says it’s for BM7000 but I think the same module would fit the 6500. Have a look here: https://www.facebook.com/groups/2263448640/posts/10160172517103641/?comment_id=10160172597758641

    #9109
    Guy
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    • Warwickshire, UK
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    And there are pictures of a genuine RIAA board attached to the first couple of posts here:  https://archivedforum2.beoworld.org/forums/p/7576/67094.aspx#67094

    I doubt that it’s still for sale!

    #9110
    Guy
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    • Warwickshire, UK
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    A further thought:  You have said that you will hide the BM6500 away.  One of the reasons that (in later models) B&O moved the RIAA from the Beomaster to the Beogram was to allow Beograms to be sited further away from the Beomaster. By fitting the RIAA in the Beogram, a stronger signal was sent and a longer cable could be used.

    With this in mind, you may wish to go for the Iconic-AV RIAA pre-amp and connect it quite close to the Beogram.

    There’s so much to think about!

    • This reply was modified 2 months, 1 week ago by Guy.
    #9193
    Sia43
    BRONZE Member
    • Topics Started 13
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    Thanks, Guy, for all your help. They all sound logical. I’ve now finished the deal on BM6500 and will have a look for the serial number you mentioned. If it doesn’t have a built-in RIAA, I will need one plus the delay box you suggested.

    Now I need to ship all the stuff to Spain from Sweden, a long drive that will need to wait a few months.

    #9251
    Guy
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    • Warwickshire, UK
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    If it doesn’t have a built-in RIAA

    If you do need to look inside the Beomaster, I now know where the RIAA board would be fitted! It’s rear left of the pre-amp PCB, fitted vertically about 5 cm inboard of the antenna socket. To see if you may have to pivot the Tuner board upwards into its service position.

    If you look carefully at this eBay listing, on the bottom left of the fourth photo you can see a row of holes labelled ‘RIAA’ (just visible!) into which the board would be soldered: https://www.ebay.co.uk/itm/255129827540

    Good luck with the move to Spain!

    #9255
    Sia43
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    Unfortunately, I can’t check the Beogram and Beomaster yet as it seems like the MMC2 that followed the Beogram is not working. I haven’t dared to open up the Botmaster yet but check the area you described by pushing up the cable cover. it might have the RIAA and looks a lot like this picture.

     

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    #9257
    Guy
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    • Warwickshire, UK
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    it might have the RIAA and looks a lot like this picture.

    If there was an RIAA it would possibly be visible just to the right of the board with the two blue connectors, but the RIAA board would be mounted vertically but perpendicular to the rear panel of the BM.

    #9259
    Sia43
    BRONZE Member
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    Then maybe it has not the RIAA. Attached are a few pictures of my own amp. If it doesn’t have the preamp, I will try to find the one that can be built in as I already have several boxes (including the BM) that I need to hide. However following your advice (to keep the RIAA close to the Beogram), to your knowledge, are there any RIAA preamps that can be built in a Beogram 9500?

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    #9273
    Guy
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    • Warwickshire, UK
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    I can’t tell from those photos. Perhaps it will have to be opened to check.

    are there any RIAA preamps that can be built in a Beogram 9500?

    I really don’t know. There are lots of similarities between the RIAA and non-RIAA beograms (they share a service manual) but I am not sure if an RIAA (either B&O or third-party) will physically fit or be compatible.

    In the shared service manual there is only one circuit diagram covering BGs 3000, 3300, 3500, 4500, 5005, 5500, 6500, 8500, 9000, 9500 and TX2. This shows the RIAA as a discrete PCB (PCB4, part number 8005269) but annotated to say ‘only in Beogram 3500/4500 and 6500’.

    Perhaps other forum members have better knowledge of the Beograms; it could be worth starting another thread titled ‘Retrofitting RIAA in Beogram 9500’.

    EDIT: You can see pictures of an internal RIAA in this document – para 7:  http://www.condoraudio.com/wp-content/uploads/Projects/BeoGram-4500-Turntable-Restoration-Repair.pdf

    • This reply was modified 2 months ago by Guy.
    #9300
    Sia43
    BRONZE Member
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    Hi Guy,

    I’ve just contacted Søren Claudius, located in Denmark, and he quickly replied that the module you referred to is indeed compatible with both BM6500 and 7000, which is good news. I ordered one from him now, and the price is very reasonable, while installation requires some soldiering. I decided to keep the Beogram close to the Beomaster in a cabinet so that I won’t need an RIAA preamp close to (or installed in) the Beogram after all.

    Looking now for an MMC2 or MMC3 and the delay box, and then I will hopefully be ready.

    Planning for the Beogram in an NL + ML + MCL network and finding the devices and parts has been quite time-consuming and expensive and required lots of help from yourself and other friends in this community (for which I’m truly grateful). Above all, it has been great fun. There is something genuinely engaging about integrating B&O stuff.

    • This reply was modified 2 months ago by Sia43.
    #9311
    Guy
    Moderator
    • Warwickshire, UK
    • Topics Started 10
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    Good to hear; I think that fitting a compatible RIAA to the BM6500 is a good idea that keeps the system as close to standard as possible.

    According to the service manual, when the RIAA is installed there are three links on the original PCB that need to be cut to ensure that the phono signal is diverted via the RIAA.  (EDIT: Actually one of these that needs to be cut is the connection to datalink pin 7, because non-RIAA-equipped Beogram use pin 6 for datalink)

    I bought my ‘S’MMC4 from Soundsmith in the US.  They also do SMMC1, 2, and 3 if your budget stretches further than mine!

    • This reply was modified 2 months ago by Guy.
    #9317
    Sia43
    BRONZE Member
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    Thanks, Guy; I’ve found a Beogram 5500 with an MMC2 at a lower price than what is on the market these days for an  MMC2 alone. According to the current owner, the BG is in excellent condition, so I will listen and probably buy it if it is in good condition. Do you have any ideas about inspecting a pickup besides listening to it?

    #9320
    Guy
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    • Warwickshire, UK
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    Do you have any ideas about inspecting a pickup besides listening to it?

    Sorry but my Beogram/MMC experience is limited to my BG6500 (Beoworld Xmas Prize Draw win), its SMMC4 and a single LP – Dire Straits, Brothers in Arms 🎸

    I am sure that other forum members can help out and will be along to offer advice …

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