Sign in   |  Join   |  Help
Untitled Page

ARCHIVED FORUM -- March 2012 to February 2022
READ ONLY FORUM

This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022

 

Replacing reservoir caps with higher value on 4400

rated by 0 users
This post has 4 Replies | 1 Follower

Garten
Not Ranked
Sweden
Posts 72
OFFLINE
Bronze Member
Garten Posted: Fri, Oct 21 2016 6:29 AM

Hi All,

I've seen this topic around for a while, what are the dangers of using reservoir caps with a higher capacitance than orignial. But it seems to depend on the device how far you can go and what the relevant tolerance is.

Im half way through a 4400 project and it is time for the reservoir caps, and i have a more or less good fitting pair at home, the problem is they are 15000uF instead of the original 10000uF.

Would it be reckless to put them in, or is this within safe margin not to blow the transformer? (or cause any other damage/issues)

 

many thanks

//G

BM 2000 *1974, 2x BM 1200, BM 1001, BG 1200, BG CD X, BC9500,BM3300,Bcord 3300, BG CD3300, Beovox Cona, Beovox CX100, Beovox 1200, Beovox RL60.2

Dillen
Top 10 Contributor
Copenhagen / Denmark
Posts 13,191
OFFLINE
Founder
Moderator
Dillen replied on Fri, Oct 21 2016 2:41 PM

The rush-in current at power up is the problem.
The filter caps load the transformer and particularly the rectifier quite drastically.

10.000uF is absolutely adequate - and what the rest of the Beomaster was built for.
15.000uF is quite an increase. It would be overkill and, as said above, could lead to problems.

Martin

Garten
Not Ranked
Sweden
Posts 72
OFFLINE
Bronze Member
Garten replied on Fri, Oct 21 2016 6:33 PM

Thanks Martin,

I though I could save a buck or two, but I'll take your advice and order correct value new ones.

For another Beomaster I need 5000uF but they seems hard to come by, is it then better to choose 4700 then push it upwards to 6000-6800?

Even 20% range will only yeld 6000, but I guess there is some margin on the diodes in the rectifier etc...

regards

//m

BM 2000 *1974, 2x BM 1200, BM 1001, BG 1200, BG CD X, BC9500,BM3300,Bcord 3300, BG CD3300, Beovox Cona, Beovox CX100, Beovox 1200, Beovox RL60.2

Søren Mexico
Top 10 Contributor
Mexico City
Posts 6,411
OFFLINE
Bronze Member

I have used 4700 uF instead of 5000 uF in several BMs, no problems, went one step higher on the voltage

Collecting Vintage B&O is not a hobby, its a lifestyle.

Garten
Not Ranked
Sweden
Posts 72
OFFLINE
Bronze Member
Garten replied on Fri, Oct 21 2016 7:41 PM

Many thanks for the tip, I think thats the way I will go.... it just kills me with the postage buying a few parts here and there..., the last over the counter place for components closed in Gotheburg a few years back,,

Well well, in anycase, its not too bad..it friday evening , while I wait for new caps I perhaps find out what that white wine my wife bought looks like from the inside.

thanks all!

BM 2000 *1974, 2x BM 1200, BM 1001, BG 1200, BG CD X, BC9500,BM3300,Bcord 3300, BG CD3300, Beovox Cona, Beovox CX100, Beovox 1200, Beovox RL60.2

Page 1 of 1 (5 items) | RSS