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On Bo's workbench

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BO
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BO posted on Mon, May 12 2014 8:52 AM

Beolit 600:

When I got it the speaker was locked, due to dislocated magnet. Dial-cord was missing. Dial was discoloured due to heavy corroded indicator balls. And some other minor flaws. 
Speaker was dis-assembled re glued. Dial was cleaned. New dial-cord attached. etc.

An unexpected nostalgic and nice feeling, to listen to a transistor radio, when cooking. Haven't listened to a transistor radio for decades!


//Bo.
A long list...

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chartz
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Answered (Verified) chartz replied on Fri, Aug 29 2014 3:52 PM
Verified by BO

And my recent experience with classic Beovox 5000 speakers is also enlightening. Night and day, the caps were mostly shot, showing absurd values with rocketting ESRs and raised capacitance. 

On my Beovox Monitor70 speakers, a re-cap made no difference at all, the caps still being up to specs.

Another classic device where old caps seem to last forever is the Beolab 5000 amplifier.

But I'd say yes, replace the old caps, it is good for the peace of mind, if anything.

Jacques

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Peter
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Peter replied on Mon, May 12 2014 3:49 PM

These are lovely elegant radios that look modern even today. I would rather have one of these than the Beosound 3. Easy to use and super sound. You did well to fix the speaker!

Peter

BO
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BO replied on Mon, May 12 2014 7:45 PM

Beovox S80.2:

Refoaming bass drivers.



//Bo.
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Menahem Yachad
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I had one for repair a few years back, with a bad output transistor.

It was Germanium, and I couldn't find a replacement, so I did a mod to convert the two output transistors to modern silicon units.

Menahem

haumovie
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haumovie replied on Thu, May 22 2014 11:45 AM

Did you shim the drivers for the S80.2's or freehand? Looks like the dustcaps are untouched.

I picked some s80s last night and just ordered foams.

I have just finished a set of cx100s where 3 of four were done freehand, but the last one I had to redo with shimming - for some reason that one didn't want to sit right on its own:)

BO
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BO replied on Thu, May 22 2014 12:16 PM

I used to shim, but doesn't do that so often anymore. Reason is that I fund the result better with other methods. On smaller speakers I often use the cloth-peg method. On bigger I apply a low frequency tone (80hz) and use the magnetic field a a help of centering.

I,m not saying this is best and what you should do but it works best for me. I've done at least 100+ individual drivers, all with good result.

//Bo.
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BO
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BO replied on Sat, Jun 7 2014 4:10 PM

Beovox M100:

Got this nice pair of M100 at a reasonable price. Cabinets and all drivers except the mid-range drivers are in good shape.

  

Mid-drivers refoaming
  

  

  

    

Dust-cover pegs needed repair
  

Didn't get the stands, so I decided to make my own. I've got the measurement from Sonavor. Many thanks for that.

Made some CAD drawings.

Making the parts
  

  

  

To be continued...

Left to do, Welding, Painting & Surface treatment.

//Bo.
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Dennis
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Very nice work Bo! Hopefully I'll soon get around refurbishing my M100s. 

The drivers you refoamed are actually not mid-range drivers, they are 'dynamic filler drivers' according to B&O's own description. I have a BeoVox M100 brochure, where a description of the different elements of the M100s is to be found. It's in Danish, but that shouldn't be a problem for you to understand, so if you want me to, I could try and scan it later and send the PDF to you? 

Keep up the good work! Exited to hear more from you! Smile

/Dennis

BO
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BO replied on Sat, Jun 7 2014 5:00 PM

Dennis:
if you want me to, I could try and scan it later and send the PDF to you?
Yes please, I would appreciate that.

Dennis:
Keep up the good work! Exited to hear more from you! Smile
Thanks a lot, encouragements makes the work even more fun!

//Bo.
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sonavor
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Wow!  You've been busy.  The project is coming along great.

-sonavor

Doonesbury
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Is this your personal shop?  I wish mind had all of the equipment and was as clean and well-lit.

D

BO
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BO replied on Sun, Jun 8 2014 8:40 AM

sonavor:
Wow!  You've been busy.  The project is coming along great.
ThanksSmile

Doonesbury:
Is this your personal shop?
No its a friends, but its really nice to have the oppotunity to use it. Smile

//Bo.
A long list...

BO
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BO replied on Sun, Jun 8 2014 7:53 PM

Beomaster 8000:

Got this one for a while. Been hesitating to open it up. Its in nice cosmetic shape but got some faults
- Volume control is not working.
- One channel is dead when listening to FM radio
- The unit goes into protection mode after a while. ½-30 minutes depending on speakers. 

The one dead radio channel problem was isolated to the FM Inteface board.

It turned out to be an defect OP amp


A new and better one in place and the radio sings again!

The volume control was an easy fix. Dust in the optic sensor for the flywheel. Idle current & DC offset was adjusted according to the manual.
Now it seem to work again. Still have to fix one segment in the volume display. Will run it with a couple of different speakers for some time to verify it is functioning properly

My intention is to use it together with my M100 speakers when they are ready.

//Bo.
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BO
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BO replied on Mon, Aug 4 2014 7:22 PM

Beovox M100 Stands, continuing:

Welding time.






Painting:









Remaining is surface treatment of the upper parts (zinc plating).

//Bo.
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Leslie
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Looks great Bo, excellent job. Did you put felt (vilt) under the stands? That doesn't look to good to be honest.

Brengen & Ophalen

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