Beo Master 7000

62 replies
H(
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henrykin (archived)
Bronze
Posted April 29, 2009 at 09:05 GMT
#1755513

What I did was to use the technics as pre amp by jack plug from technics to 5 pin din

into BM 7000 aux B&O said to use  this port. Set both vols to 0

I increase vol on 7000 TO 12 and then incresed the vol slowly on the technics

and the vol increased nicely on my 7000 to sound like the vol of my 5500.

Here's the e-mail I recieved

We are pleased to see that you are the owner of Beomaster 7000. You can connect a pre-amplifier to the Audio AUX connection. However we are not able to recommend a model.

Kind regards
Bang & Olufsen a/s

Mette Krabbe Helmholt
BeoCare
 

and no fireworks.

Now waiting for a preamp from the US

R(
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rayfenwick (archived)
Bronze
Posted April 29, 2009 at 10:17 GMT
#1755514

henrykin wrote:

Sorry lads no fireworks

Hello Henrykin

Nobody wants fireworks!  

I just wanted to know how you were going to connect the Technics and the Beomaster.....

I think I can safely say that none of us want to hear of a piece of B&O going up in smoke, and certainly not so someone can say "told you so..."

H(
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henrykin (archived)
Bronze
Posted April 29, 2009 at 10:37 GMT
#1755515

Sorry if I appeared rude.

W(
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wirralsimon (archived)
Bronze
Posted April 29, 2009 at 11:11 GMT
#1755516

Interesting discussion to follow but I am not in a position to make a technoical judgement! Happily my Beomaster is the 5000 so I don't have the extra caps to start with.

Perhaps the clincher is the fact that the Beomaster 7000 is question was unlikely to be used without the mods, so in the case leaving the  the amp unmodded  wasn't an option.

Simon

 

 

 

R(
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rayfenwick (archived)
Bronze
Posted April 29, 2009 at 12:50 GMT
#1755517

henrykin wrote:

What I did was to use the technics as pre amp by jack plug from technics to 5 pin din

into BM 7000 aux B&O said to use  this port. Set both vols to 0

I increase vol on 7000 TO 12 and then incresed the vol slowly on the technics

and the vol increased nicely on my 7000 to sound like the vol of my 5500.

Here's the e-mail I recieved

We are pleased to see that you are the owner of Beomaster 7000. You can connect a pre-amplifier to the Audio AUX connection. However we are not able to recommend a model.

Kind regards
Bang & Olufsen a/s

Mette Krabbe Helmholt
BeoCare

and no fireworks.

Now waiting for a preamp from the US

 

Aha, mystery solved!

Yes, this is the correct way to connect them - all that talk of 500W output had me confused, as of course the preamp output of a 500W amp is the same as the preamp output of a 1W amp....

Other than some more inputs (probably including digital) what have you gained by using the Technics?  The signal still goes through the Beomaster 7000's preamp, so I'm not sure what you've achieved... 😮

Have you got any speakers attached to the Technics, or are you just using it as a preamp?  Some amps don't usually like playing into no load at all, it confuses them...

Plus this brings me on to one of the things that always annoyed me about the Beomasters that take passive and active speakers: when connected to actives, that poweramp is still working, which is a waste of energy really...

 

R(
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rayfenwick (archived)
Bronze
Posted April 29, 2009 at 12:51 GMT
#1755518

henrykin wrote:

Sorry if I appeared rude.

Don't worry about it,  we all want the same - that you enjoy and get the best from your B&O 🤒

H(
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henrykin (archived)
Bronze
Posted April 29, 2009 at 13:47 GMT
#1755519

I'm trying things out of curiosty. The mod seems to have worked for the

quality of sound now I'm trying to improve on the volume at low end.

It's now become an addiction.

I'll probabley be dead and buried by the time this is sorted. LOL

What else I find crazy it comes with a connection for a graphic equlizer

and B & O don't do one.

If anyone has any info on upgrading the preamp thats in it I'd be grateful

H(
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henrykin (archived)
Bronze
Posted April 29, 2009 at 14:19 GMT
#1755520

Sorry everyone I got this mod from beo central not the workbench

sorry everyone for misleading info.

link

Beomaster 5500, 6500 and 7000

6th January 2009

If you have owned a lot of B&O equipment then you will have probably noticed that thesse models give a slightly disappointing sound when used with passive loudspeakers when compared to some of the earlier designs. This is surprising as the power amplifier circuit is very similar to that of the Beomaster 2200, Beomaster 5000 and the Beocenter 7700 (amongst many others), all of which give very satisfactory performance.

The Beomaster 5500, 6500 and 7000 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 reasonably well. Therefore the power amplifier circuit was investigated 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. With the capacitors in circuit the sound from one Beomaster 5500 was lifeless, bland and uninteresting, without them it was more similar to a 5000, engaging and lively with a full, rich tone.

It is not clear what the purpose of these capacitors is 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. [Beomaster 5500, Beomaster 6500, Beomaster 7000]

H(
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henrykin (archived)
Bronze
Posted May 1, 2009 at 09:49 GMT
#1755521

Just to keep you all informed my amp is still working

with no problems. From last friday

DI
Offline
Dillen
BronzeModeratorFounder
Posted May 1, 2009 at 13:42 GMT
#1755522

Good !
Perfectly safe to remove those caps then. Sorry that I raised doubt.
Stupid guys to add them in the first place, what were they thinking ?  😂

Martin

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