Beo Master 7000

62 replies

Peace my friend, we only have this one planet.
I merely recommended a different mod and told you what B&O's answer was.
Neither of us told you it would distort and I don't say it WILL go up in smoke.
Please understand this.

"They have been introduced as a safety precaution if the volume gets turned up
enough to cause clipping, in other words when it starts to distort."

- Was said by B&O. Not me !
But it partly confirmed my guess at the caps function.
Apart from that, the amplifier WILL distort if cranked up too high.
Any well-proportioned amp will.
The difference being the way it distorts. This way is called soft-clipping and is
here to protect your tweeters rather than the amplifier since clipping causes a high
amount of harmonics (edgy and sharp curveforms with huge amounts of energy).

"Won't you face a serious risk of self-oscillation in the amplifier if you remove the feedback caps ?
It's quite common to see unstable DC-coupled amplifiers like this one go into self-oscillation at
full power, typically at a high (inaudible) frequency, 100KHz or so, overrunning the amplifier without
anyone knowing about it until it dies in smoke and flames."

- Was a question based on (more than 30 years of) experience with (not just) B&O and
based on the fact that I sat down with the schematics and tech info sheets and asked myself why those
caps were introduced in the first place.

There's no way I can tell you it WILL go wrong. Clearly, lots of owners would
have had this problem if that was the case.

Clearly neither you, nor the experienced B&O tech guy you spoke to, have had
enough Beomasters of this type on the bench to know when an amplifier has burned
for "no apparent reason".
I have only limited experience with this "somewhat new" B&O thing the Beomaster 5500 is
but out of the maybe 70 or 80 Beomaster 5500 units I've seen, I think, 4 or
5 cases of "mystic blows" of which at least 2 or 3 was beyond economic repairs.
Neither of these had the caps mounted.
I never saw a "mystic blow" in a Beomaster 5500 that had the caps, all faults
in these could be explained otherwise. (Mainly cracked solders, idle current
runaways, driver or speaker shorts, electrolytic leaks etc.).
Yours may work fine for years.

"you should remember what you write in previous posts."

- ...
I'm lost for words so I'll just shut up. I know nothing about electronics and if you need advice or help
I suggest you ask an experienced guy (=someone else). 

Martin

OK peace we will agree to disagree.

End of

Regards Henry

Martin

I'm lost for words so I'll just shut up. I know nothing about electronics and if you need advice or help
I suggest you ask an experienced guy (=someone else). 

Not once did I imply that you know nothing

Your knowledge and imput is as valuable as anyone elses and I wouldn't hesitate to ask

you for help and I also would like to think you would tell me I was saying something wrong

Just because I didn't agree doesn't mean I don't listen.

Sorry if it got a bit over heated

Henry

Martin is one of the most knowledgeable people about B&O that I know. His opinion is highly respected throughout the B&O world. His collection has also been one of the largest. He is a top contributor both here and on Beocentral where he has donated many superb pictures from his own collection. The modification to the 5500 was indeed made because of instabilities, particularly in multi-room set ups. I have two 5500s - my main one has the capacitors in place - the other one has had them removed. I actually detect little difference with CX speakers - more with RLs. I will not be changing my 7000 though or indeed the other 5500. If Martin says they are there for a reason, that is good enough for me. I am sure that removing them will have an effect - but it would appear that the effect is both good and bad. I think therefore that it should be the decision of the owner whether to take the risk.

My B&O Icons:

BeoCenter-9500.png BeoCenter-9500.png
Beoremote-Beo4.png Beoremote-Beo4.png
Beovox.png Beovox.png
Beovision-11.png Beovision-11.png
Beotime.png Beotime.png
Beosound-Stage.png Beosound-Stage.png
Beosound-Moment.png Beosound-Moment.png
Beosound-5.png Beosound-5.png
Beosound-2.png Beosound-2.png
Beoremote-One.png Beoremote-One.png
Beoplay-Portal.png Beoplay-Portal.png
Beoplay-Earset.png Beoplay-Earset.png
Beomaster.png Beomaster.png
Beolit.png Beolit.png
Beogram-400x.png Beogram-400x.png
Beocenter-2.png Beocenter-2.png

Peter

I totally agree with you Martin has vast knowledge

and it is up to the owner what they do.

It was a clash of ideas thats all nothing more nothing less.

Henry

I'll be deleting my acount tomorrow. martin So your littie click can stick together.

Eh?  Where did that come from? 😮

I've just read this thread, twice - and i thought it was informative, fair and balanced. If we all agreed about everything, the forum would be dull - but when it comes to 'black and white' tech specs i assume it's less of a grey area than a simple opinion, surely?

Anyway - i don't see any 'clicks' here - only people trying to help and offer their advice/knowledge...  Sorry you feel that way.

Lee

I took your advice I have just come back from an electronics shop I took the mod that you recommended  and asked what he thought and his opinion was it's beyond the extreme. I would not attempt it.  The man has been in the shop from school and his father before him.

henrykin wrote:

I took your advice I have just come back from an electronics shop I took the mod that you recommended  and asked what he thought and his opinion was it's beyond the extreme. I would not attempt it.  The man has been in the shop from school and his father before him.

Are you referring to member Die Bogener's (also called Martin) modification here?

If so, it isn't THAT complicated and I certainly wouldn't rate it as being "beyond the extreme"😕

Chris.

 

I am but I was not slating it. I looked at the mod at the suggetion of

Dillen  and took his advice to ask elsewhere. Thats all

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