Replacing "negative on can" capacitor

[Sniarf Eggbird]

Hi everybody!

I'm about to recap the power supply from a KSG 625 small console i have.
It's a mid-seventies, discrete, transformer balanced, "portable" console, made in east Germany, by VEB Studio Elektroakustik.

I'm a bit stuck though, since on 2 of the capacitors (1000uf/35V) is written : "-Pol am Geh.", which i guess means " -Polarity on housing".
There is only one soldering leg at the bottom of the capacitor and then there is a ring at the base of the aluminum can, that's soldered to the rest of the network.

How should i replace these? Should i find the same type of capacitors or could there be another way?
Any info on this type of electrolytic capacitors would be really appreciated, since it's the first time i see them.

Here are a couple of photos:

Thanks a lot!
Thomas

Edit: Rescaled photos

 

[Sniarf Eggbird]

one more

 

[ln76d]

You should replace it with usual electrolytic capacitor, where the "Gehause" (-)  you should connect to the standard (-) leg in new capacitor.  There's no connection to the metal mounting support - it's isolated.
If you will need schematics for KSG send me your email on pm.
Probably you can find this size caps (same mounting type)  on bay, i bought there siemens/epcos from "not so long time ago" production.
If you will need modules (without transformers) for spares  let me know.

 

[Sniarf Eggbird]

Thanks a lot ln76d!
That sounds great, will try to find same type of mounting.

Just PMed you.

All the best,
Thomas

 

[API]

Check at askjanfirst.de he has alot of these types of caps.

 

[Sredna]

askjanfirst has only high voltage caps in this style but there's a 1000uF/100V cap there, for 33€! 

Are you shure that you really need to change this cap, is it out of range or defect?

You could do as  ln76d suggested with a new axial or radial cap.
If you want to keep the original look you could always hide the new cap inside the old one!

 

[ln76d]

You could do as  ln76d suggested with a new axial or radial cap.
If you want to keep the original look you could always hide the new cap inside the old one!

      ;D

I did not have this in mind

I need to work on my English.

I'm not a fan of cap inside old cap can, maybe if there's possibility to glue new capacitor for stabilize it.

We figured out on PM, that this should be 2000uF capacitor. On the old one (-) is on a can because it have two sections.
They are connected in parallel to get 2000uF.
Cheapest solution could be modern sized 2200uF/50V and mounting bracket. It could be Low ESR.

 

[Sniarf Eggbird]

Thanks guys!
Yes, 33€ is a bit on the expensive side  , but thanks for the link anyway, nice site.

I finally went for this one: link.

I'm going to attach it with a bracket to be safe.

Cheers,
Thomas

 

[ln76d]

Good choice

Next week i will let you know about AU632.

 

[johnheath]

I am sure that I have bought a couple of electrolyts that have the (-) in the can and  (+) in a ordinary solder lug...

I will try to find it so I can give you a link.

They do not cost 33 euros

Regards

/john

 

[pucho812]

Normally you see such things when it is multiple values/caps inside one housing... 

 

[johnheath]

Yes, but I've  found single caps somewhere but I can't remember where

regards

/John

 

[Sniarf Eggbird]

Everything worked out great!
Attached the new cap on a veroboard.

Now, moving on to the rest of the channels..
Thanks for your help!

Thomas

 

[joaquins]

What are you going to do with the extra space now?? you may fit a µC board there to do some fancy stuff and turn some audio rhythmic LEDs  8)

JS