saba: 6-3D (6-3 D); Schwarzwald-Automatic

Hallo,

I'm a new member here, I collect radios during 25 years and live in Belgium.

 

I'm trying to restore a chassis from a Saba Scharzwald 6 - 3D automatic ( Nr. 5/28364) but I have no chematic of it.

There was a problem with the output transformer so I replaced them, with the previous transformer I get problems with the puschbutton section plates (contacts) they go to hot and produce somme litle smoke, I supose there was to much tension (voltage) on it, but the radio was playing (shortly because I don't whant to burn out the bakelite plates of the contacts).

I replace the transformer and the radio dont play annymore, when I place a bridge on the poles of the output transformer I get overheating and probebly to high voltage on the contact plates from the AM/MW/KW/FM section.

Is there annybody who have this problem before?

Can someone help me out with this?

I realy like to get this radio alive because its realy a nice radio with a case in mint condition.

Kindly regards,

David.

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Hi, David,

one of the Problems is the Material of the Contact Holders. The German name is "Pertinax".

Normally it works fine, but if the Contacts are sprayed with Contact Spray, this Spray goes into the Pertinax, and if the Radio is turned on, before all of the Spray has evaporated, then there is Current, whee it schould't be.

There are two chances to solve that Problem. One is, to eliminate all the High Voltage from the Contact Block, and use external Microswitches, attached to the Contact Block, and activated by the Contact sliders, to perform switching. But this way the Radio will be away from "Original".

The other chance is, to remove the Contact Sliders, ( there is a white Cover behind the Dial Glass, and after removal, the Sliders go out to the front ), and clean the Surface troughly from all "black residue ), and apply a light coat of laquer just onto the Pertinax ( keep the contacts itself clean!! ).

Also the Contact Block needs to be cleaned as described. When all the black residue has been removed, and the natural colour of the Pertinax is visible, it schould be OK.

Worst Case Scenario is, when the Pertinax is completely burnt.

Hope this helps.

There was a Thread including Pictures. I will try tofind it, and give You Information about this.

If You are in doubt, please try to make pictures.

Best Regards,

Henning

EDIT: Here is the link to a Restoration for a Saba Freiburg. The Text is in German, but i hope the pictures are interesting. On the last Post therre is the Link to Part 2.

http://www.radiomuseum.org/forum/saba_7_freiburg_automatic_in_not.html

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Hi Henning,

 

Thank you for your help.

Can you tell me with what kind of product I can clean the "pertinax"?

I'm afraid the contacts have been cleaned with a non electric spray before the radio get in my hands...

The pertinax seem to be dark like it has recived an oil substance...

I will wait for your reply to know whith wich product I can clean the contacts.

Kindly regards,

David.

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Hi, David,

Oil itself is not the Problem. The Problem is burnt Pertinax, because the Pertinax looses it's isolating Function ( only on high Voltages ).You need to identify if there are traces of burnt Pertinax, and if, remove theese traces completely with an old teethbrush, or a piece of sand paper or similar. Please make shure that no residue falls into other Contacts or Tube Sockets.

Many People in Germany use "Ballistol" or "WD40".

 

In Your first Post You told us, that You have replaced the Output Transformer. Please make shure, that the new Transformer is of the same kind, than the old one. If You use a Transformer from an other Radio, please tell me from which Model the new transformer is, just for me to know better.

 Hope this helps. Please feel free to ask further Questions.

Best Regards,

Henning

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Hi Henning,

 

I remove the transformer from a Saba Freudenstadt 6-3D.

They look exactly the same and I found the same codes on it.

I hope this model is o.k.?

Kindly regards,

David.

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