The Workbench

Re: Beovox S75 troubles

lausvi — Tue, 27 Nov 2007 14:21:50 GMT

Die_Bogener:
Where do you live? Looks like oxid... high humidity, salt or some pets [:'(] You can clean it or not, it wont affect sound or anything else, it just doesnt look good. You can use a oily piece of cloth and clean it.

I live in warm city appartement, but I bought this from auction and I believe that the speakers were stored in some cold storage at the country. The smell was exactly like out summerhouse and the medal pedestal was rusted. I noted already then that few speaker crews were lightly rusted but never took out the speaker until now.

What a relief. Thanks. I was so depressed and believed that it would be too bad, I hoped that it would as easy as you say. The speaker itself is very clean except the back and I'll try to clean it better when I replace the caps later on. I didn't check if the other speaker is as bad but I guess it will be quite the same

Die_Bogener:

47uf or 50uf... dont care about this. Old electrolyt capacitors have up to +100% -50% tolerance. Use the same or a higher voltage.
Fix the connector with some epoxy glue.

Thanks. I didn't gave it too much tought. Better already. I'll order the new parts to see if there's any difference. Making good even better. :) Is the one marked "FOR CROSS OVER - BIPOLAR - 25v 12 uF" any speciality? Does it make any difference to normal bipolar cap with same values?

I'll try to glue it next time, now I had no glue to be found, but I'll prepare better for the next time.

Thanks for your help.

Re: Beovox S75 troubles

Die_Bogener — Tue, 27 Nov 2007 14:05:06 GMT

Where do you live? Looks like oxid... high humidity, salt or some pets [:'(] You can clean it or not, it wont affect sound or anything else, it just doesnt look good. You can use a oily piece of cloth and clean it.

47uf or 50uf... dont care about this. Old electrolyt capacitors have up to +100% -50% tolerance. Use the same or a higher voltage.

Fix the connector with some epoxy glue.

Beovox S75 troubles

lausvi — Tue, 27 Nov 2007 13:39:21 GMT

After reading the thread about the replacement of capacitors in vintage passive B&O speakers, I desided to check my BeoVox S75's. But when I took out the bass speaker (SEAS) I found out a terrible fact: my speakers had been get mouldy and they look horrible! The bass speaker and the smallest (tweeter) had a load of mould behind and under the medal framework. Also the bass's cable connector were snapped out of the medal. The speakers work and from the front they look perfect but the discover of mine made me so depressed... :(

Attached is a photo of the bass speaker to help getting in what I am trying to explain

1) How does the mould affect the speakers in general? And will it spread or cause anything else?

2) How I should try to remove it? I wiped with paper and it did get a bit better, but not perfect

3) How should I fix the cable connector's? Should I just glue them back?

4) When (someday) I'll replace the capacitors, anything special to keep in mind? The old ones are (except one) rated 40v, shall I order new ones with same voltages or higher? Keeping the capacities of course the same. I compared the values marked in components to the part list in the service manual (on this site) and they differ quite a lot (47 mfd marked as 50 etc). Is this normal?