aja: 5842; Need Electrolytic Cap values in can

Hi All:

I am working on a AJA 5842 without a schematic.  Can someone tell me the electrolytic cap values?  (I believe the can is a double).  I would need the voltages too and how to identify from under the chassis were each value goes- it would be nice if the two values were the same.

Thanks- Tom

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Hi Thomas,

I might be wrong, but all similar models of German radios I have handled use a 50 + 50 microfarad capacitor, rated for 350 Vdc.

Emilio

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I recall seeing on the electrolytic what looked like '50 uf' and later 350/350 but was not sure what it meant (the radio is not currently in my posession).  Based on your information I have to think 50 uf at 350 vdc both sections is correct.  I will try this when I get the radio back.

Thank You!  Tom Ranz

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Yes, you need a dual section capacitor, 50 uF per section, 350 V dc working voltage each section. It was the standard type in German radios during the fifties and the early sixties.

Emilio

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Great, I can replace the cap.  Let me ask, does this radio have a selenium or solid state rectifier?  None of the tubes I looked at appeared to be the typical rectifier configuration, I wish I had it in front of me now.

Thanks- Tom

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Hi Thomas,

looking at the photos of the chassis, you can see the selenium bridge rectifier, a black AEG can on the left side. Even if the code is partially hidden, it should be a B250C75, 250 volts rms at 75 milliamps. If the first power-on of the radio is performed at reduced voltage for few minutes, in order to reform the rectifying barrier, the rectifier should operate fine. Else you can observe a considerable temperature increase, maybe the fuse blows, due to reverse currents.

Emilio

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I was wondering what that thing was... I've never seen one before.  I noticed it was connected to the cap(s) and assumed it was a dropping resistor or similar.  When I have the radio in my posession again I will replace the caps and bring the volts up slowly as you suggest and hope everything else is good- without a schematic it could be complicated.

Thank You very much for your help!

Tom Ranz

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