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ARCHIVED FORUM -- April 2007 to March 2012 READ ONLY FORUM
This is the first Archived Forum which was active between 17th April 2007 and
1st March February 2012
Latest post 02-18-2010 8:06 AM by ouverture. 16 replies.
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01-07-2010 5:26 PM
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ouverture
- Joined on 04-20-2007
- London
- Posts 282
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has anyone modified their BM5500 so that it works in the way as a BM5000 works, specifically the preamp output connection, the 5500 for some reason did not follow the 5000, instead of tapping off just before the power amplifier the 5500 it was simply an attenuated
output from the loudspeaker connection, I think the way the BM5000 did it is the right way and much more professional, so I would like to ask any beoworlders if they think the same ?
especially if you get the Penta diplays to work at the same time doing a mod like this........
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Puncher
- Joined on 03-27-2007
- Nr. Durham, NE England.
- Posts 9,588
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I agree. I have the 5000 and am happy that they did it the way they did (with a "proper" preamp out)!
The big problem is that modern remotes can't control the 5000 - as a stand alone amp (with MCP 5000) I think the 5000 is better than the 5500.
Sending a signal through a power amp and then attenuating it again to get a line level signal smacks of cost reduction and using two power amps in series (as you would using the 5500 with active speakers) just isn't right.
Generally speaking, you aren't learning much if your lips are moving.
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ouverture
- Joined on 04-20-2007
- London
- Posts 282
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that's why I want the best of both worlds, modify the 5500 so that the pre-amp works properly and I can just connect Beolab's to it without using the internal amp of the 5500
has anyone modded a 5500 to work like a 5000 ??
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solderon29
- Joined on 06-24-2007
- Posts 235
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I did this with a BM5500 to drive a pair of Beolab8000's,it worked well.
Essentially,I just fitted the '5500 with a single powerlink socket,connected as it is in the '6500,which is very similar,then daisy chained the two speakers using the standard powerlink cable.Auto on/off,mute etc all function normally.
The power amp in the '5500 then drives link room speakers.
Regards,
Nick
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ouverture
- Joined on 04-20-2007
- London
- Posts 282
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Hi Mick, that sounds nice, can you expand a bit please !
where did you solder a powerlink socket onto the 5500 ??
I guess Powerlink sockets were added to the 6500 so that Penta 2's could be used with it :-)
BR
Peter
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solderon29
- Joined on 06-24-2007
- Posts 235
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I used a spare 8 pin din cable that had a socket on one end.I cut the cable and hardwired the other end directly to the relative points of the pcb.There are a couple of components to fit also,but it's all fairly straight forward,if you can solder.The trailing socket tucks inside the connection access,or can simply hang out for connection to the powerlink cable.
Regards,
Nick
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ouverture
- Joined on 04-20-2007
- London
- Posts 282
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that is sweet, I'm off to Maplins later today to buy the components, do you remember by any chance the list of components you used, so I have a shopping list to take with me
I have opened up the 5500, and I am pretty happy soldering the 8 pin din cable to the pcb, but also wondered if you could take a picture of exactly what you wired where ?
this would be of enormous benefit I would think to other 5500 owners, especially if they can still also use a pair of Beovox passives in another room
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solderon29
- Joined on 06-24-2007
- Posts 235
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I don't have the modded BM5500 anymore,but I do have another set.I'll have a look at modding that one,and sort some photo's
You can certainly get all the bits at Maplin.
Regards,
Nick
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ouverture
- Joined on 04-20-2007
- London
- Posts 282
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oh yes please do Nick, that would be a great mod to put up on the forum, thank you
on a side note, did you also mod your 5500 based on Tim Jarman's advice about a year ago - and I quote .............
if
you have owned a lot of B&O equipment then you will have probably
noticed that the models that came after the BM5000 give a slightly disappointing sound when
used with passive loudspeakers, this is most surprising as the power amplifier circuit is very
similar to that of the BM2200, BM 5000 and the Beocenter
7700 (amongst many others), all of which give very satisfactory
performance.
The BM 5500, 6500 and 7000 all have a rather
basic pre-amplifier circuit compared to that used in the original 5000
model but this is not the cause of the problems, the same arrangement
is used in the Beocenter 9000 where it seems to work well.
Therefore the power amplifier circuit was investigated further to see what
could be causing the trouble.
The only substantial difference
between the Beomaster 5000 circuit and that used in the later models is
the addition of four 220nF capacitors C215, C216, C415 and C416. They
are not shown on all the Beomaster 5500 circuit diagrams but many sets
have them. As these do not appear in any other versions of the circuit
it seemed safe to remove them and see if the performance improved. Once removed the sound was more like the 5000, engaging and lively with a full, rich tone.
It is not
clear what purpose these capacitors serve, but performance
definitely improves if they are disconnected. Before doing this make
sure that the muting relay 3RL1 is in good condition (contact
resistance less than 0.5R at rest) and that the output bias current for
each channel is correctly set
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ouverture
- Joined on 04-20-2007
- London
- Posts 282
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Hi Mika, yes I do remember that
you were going to to improve the preamp stages on your 5500 according to something Martin mentioned ( aka Die_Bogener ) http://forum.beoworld.org/forums/t/2085.aspx
did you do it in the end ??
and when you removed the caps did you put them back but use smaller values, not 220nF like the orignals, but possibly 100nF or 150nF ??
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ouverture
- Joined on 04-20-2007
- London
- Posts 282
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solderon29:
I don't have the modded BM5500 anymore,but I do have another set.I'll have a look at modding that one,and sort some photo's
You can certainly get all the bits at Maplin. Regards, Nick
Hi Nick, are you in the UK ?? Do you have a time frame in mind for when you might mod your BM ?
best reagrds Peter
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solderon29
- Joined on 06-24-2007
- Posts 235
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In the UK and on the case sir!I've found another way to do this too,which uses existing sockets,but just needs a little mod to the pcb.Sends data out for Beolabs with display's also!Just need to test it,but need to scrounge some speakers!
Regards,
Nick
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solderon29
- Joined on 06-24-2007
- Posts 235
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Got it sorted,but can't get decent photo!
Also discovered that it's quite easy to mod the pcb so that the existing line out sockets are at line level,rather than speaker.Doing this means the other connections can be made using readily available adaptor cables.
Regards,
Nick
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ouverture
- Joined on 04-20-2007
- London
- Posts 282
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Hi Nick, any chance that you can post a "How To" for all us 5500 owners
cheers
Peter
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