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Old 22nd September 2013, 04:48 AM   #1
BRSHiFi is offline BRSHiFi  United States
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Default Couplates

http://antiqueradio.org/art/PhilcoH3...plateBuilt.jpg

What is the proper name for those infamous ceramic packages that contained several discrete components inside of them? I have heard them called couplates, monolithic film, etc.

In consumer grade amplifiers, they often contained the equalization for RIAA phono and NAB tape head stages. For tone controls, they often contained all the circuitry except the pot.

The bigger question is were they proprietary parts or were they made universally or both? Replacing them with regular parts is no big deal, as long as the schematic shows what is inside of them.
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Old 22nd September 2013, 05:40 AM   #2
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Heathkit called them PECs (packaged electronic components I think). I believe theirs were proprietary but they often showed the internals on their schematics.
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Old 22nd September 2013, 12:34 PM   #3
TheGimp is offline TheGimp  United States
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Thick film hybrid.

They are primarirly thick film resistors on a ceramic substrate. There are also versions with additional components, hence "hybrid".
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Old 22nd September 2013, 12:39 PM   #4
BRSHiFi is offline BRSHiFi  United States
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I read somewhere they almost went so far as to putting transistors in them. Regular ICs I guess wound up doing that job.
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Old 22nd September 2013, 04:23 PM   #5
TheGimp is offline TheGimp  United States
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At one time IBM was making their computers using a hybrid with transistors and thick film resistors. Others (Motorola?) also used the process.
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