Webcor ceramic phono input circuitry suggestions? - diyAudio
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Old 12th May 2014, 08:04 PM   #1
diyAudio Member
Join Date: Jan 2011
Location: Columbia, MO
Default Webcor ceramic phono input circuitry suggestions?

Hi there - I've been updating the electronics in a Webcor 1863 phonograph and ran into this "CPI" input circuitry, which I'm inclined to replace. The schematic gives no values for resistors/capacitors in the package, and I'm uncertain of how to proceed. Any advice you could offer would be appreciated. This is a ceramic cartridge phono input in a "portable" suitcase style record player.
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Old 12th May 2014, 08:58 PM   #2
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Join Date: Mar 2003
Location: Haarlem, the Netherlands
This looks like some sort of loudness control. Why do you want to replace it? Is it damaged? If it still works but for whatever reason you want to replace it anyway, maybe you could measure its characteristics and reverse-engineer the exact contents of the yellow thing somehow, although it won't be easy.
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Old 13th May 2014, 03:19 AM   #3
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Join Date: Jan 2011
Location: Columbia, MO
Hey Marcel - when this unit came to me it was only producing hum, so I began updating the old caps and thought to replace the CPI as well due to age and probable ceramic caps in the package. But I will button everything up and try it with the CPI in place unless someone has a similar circuit with values they can suggest! I've not been able to find one yet. Thanks for your reply!
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