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Kenwood KR 5200

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SF_art

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Hello AK members, I have a vintage Kenwood KR 5200 receiver that was given to me. I measured DC offset at both speaker channels 65mv and 85 mv respectively. I found a website to download the schematics. Can someone help me regarding other parts that I need to replace ie, diodes, resistors. I know the power transistors will probably need replacing. Does any one know if the electonic parts to replace are still available or are there better parts that can be use/substitute. Thanks for helping me out.

Art
 
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art galang said:
Hello AK members, I have a vintage Kenwood KR 5200 receiver that was given to me. I measured DC offset at both speaker channels 65mv and 85 mv respectively. I found a website to download the schematics. Can someone help me regarding other parts that I need to replace ie, diodes, resistors. I know the power transistors will probably need replacing. Does any one know if the electonic parts to replace are still available or are there better parts that can be use/substitute. Thanks for helping me out.

Art
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You shouldn't have to replace the output transistors if they are not blown. Transistors on the driver board, perhaps. Otherwise, replacing the electrolytic capacitors is where I would start. Diodes and resistors if they are out of spec, otherwise, I'm not sure why you would need to replace them.
 
Is there a DC offset adjustment on the KR-5200?

If not, you may have to replace the differential input pair transistors in the amp stage.
Matched pairs.

Edit: Just took a look at the schematic. Looks like there is not a DC offset adjustment.
Those numbers aren't horrible, IMO.

Rob
 
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I need to replace the driver transistors: 2SA743A & 2SC1212A. Does anybody know a cross reference for these transistors. I may also need to replace The power transistors 2SC1111. Has anyone know a cross reference that have good matches for these parts.

Art
 
Why do you think you have to replace the drivers and outputs?

Looks like you can use On-semi MJ15001 for the output.

Rob
 
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