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 Early Hybridized Modular Circuits- 1953

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PostSubject: Early Hybridized Modular Circuits- 1953   November 17th 2017, 4:52 pm

On the road to integrated circuits.


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FrankB
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PostSubject: Re: Early Hybridized Modular Circuits- 1953   December 14th 2017, 5:30 pm

I remember, not very fondly either, of running into those "Component Blocks" in AA5 radios and a couple of models of TV sets.

 They were encapsulated in a red or orangish brown "ceramic sort of" substance and had a high failure rate. 

 They became unobtanium extremely early from the mfgr's. too.
 Trying to determine which part went bad in them, and trying to repair them was a true nightmare.
 The parts were crisscross stacked and interconnected then covered with the coating. No idea as to which part was what.

CentraLab made their CRL radio & TV modules or networks that at least you could troubleshoot, and they were fantastic in the fact that in their replacement catalogs, they had the full schematics of them. Very Happy I still have a stack of them, NOS around someplace. Theirs were laid on a ceramic substrate too. They did fail, but not very often, and I believe the main failures were inherently caused by the TV mfgr's. who's engineering dept. was not really competent.

 They also made the same type of network for the input of TV sets antenna connectors to the tuners.
 I never saw a bad one of those unless they were physically damaged or the antenna wire took a direct lightening hit.
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PostSubject: Re: Early Hybridized Modular Circuits- 1953   December 15th 2017, 2:33 pm

Its astounding on the co-ordination of all the mechanical processes that made the entire operation work smoothly. Let alone the research in design of even the capacitors and resistors.

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chas
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PostSubject: Re: Early Hybridized Modular Circuits- 1953   December 15th 2017, 5:20 pm

If you have one of those Motorola tube portable radios from the early 50's, look inside probably has those "Cord Wood" modules, usually several.  I still have a few of these cord wood modules laying around.

The couplates came a bit later. Most Sam's schematics for devices that contained couplates had the internal schematic and component values for the couplate. The parts list may also have the cross-reference of a particular brand of couplate with other brands.

I never had one fail. I do understand the nuisance when one does, having to search for a replacement or install a half-dozen parts...

As a teenager, without a car. I was walking home via a road that was often frequented by supply vehicles from two electronics manufacturers. At the side of the road was a colorful plastic model of a cord wood module some 1000 times larger. This model used replicas of through hole components. I suspect it was discarded as it was already obsolete in 1963.
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