[Milsurplus] Unk circuit board from ?

[Gordon Smith]

Hi Mike,
If I may comment, it believe it makes economic 
sense that Raytheon was making discrete logic 
modules in the middle 60's. Advantages where:

1) Integrated circuits were not that cheap at 
this time and were still fairly new where as 
discrete logic circuits had been around for awhile and I believe were cheaper.
2) Space was not at a premium for this type of 
application (hence no need for a smaller IC)
3) The modules were part of a breadboarding/R&D 
system for digital circuits. As such, the people 
purchasing this system wanted to learn about 
digital systems, not this new fangled IC stuff
4) One could repair the modules in this system. 
Because of the relatively newness of them, people 
did not know about the high reliability of IC's.
5) Because everything was "open", you could 
modify anything on it and check anything on it. 
This allowed people to experiment

#4 I think is very important. Electronic gear 
back in the 60's was expected to be able to be 
fixxed by technical personnel. I have a very nice 
Non-Linear Systems Voltmeter that was made in the 
mid 60's that is ALL discrete components. Really 
neat to look at. I also have a very nice 
transistor based high end stereo system radio 
that has only discrete components in it. I've 
been told that as long as there are competent 
electronic techs out there, I can always expect 
to be able to fix it and keep it working. Compare 
that to some radios that have specialized IC's 
that are unobtanium now if they ever fry, 
rendering the radio dead because one IC died.

Just an opinion, thank you for your time.

73, Gordon KJ6IKT


At 04:31 PM 5/6/2020, you wrote:
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>
>I find it surprising that Raytheon would be 
>building discrete logic functions as late as 
>1966. By that time numerous companies had IC 
>logic functions available, including Raytheon. 73 – Mike
>
>Mike B. Feher, N4FS
>89 Arnold Blvd.
>Howell NJ 07731
>848-245-9115
>
>-----Original Message-----
>From: milsurplus-bounces at mailman.qth.net 
><milsurplus-bounces at mailman.qth.net> On Behalf Of Hubert Miller
>Sent: Wednesday, May 6, 2020 6:35 PM
>To: Military Surplus Mail List 
><Milsurplus at mailman.qth.net>; Army-Radios <main+owner at Army-Radios.groups.io>
>Subject: Re: [Milsurplus] Unk circuit board from ?
>
>Thanks, Gordon. I didn't find this myself.  I 
>was curious enough that I thought I'd have to 
>trace out the circuit, but this saves me that.
>I will donate this and some other boards to a "transistor collector".
>-Hue
>
> >Hi Hue,
>That is a G-Series Digital Circuit Module from 
>Raytheon Computer. Catalog is here:
>
><https://archive.org/details/TNM_G-Series_digital_circuit_modules_-_Raytheon_C_20180403_0001/mode/2up>https://archive.org/details/TNM_G-Series_digital_circuit_modules_-_Raytheon_C_20180403_0001/mode/2up
>
>That module is on page 28.
>
> From the catalog, I guess these modules were 
> designed to allow engineers to create and test 
> out digital circuits quickly. The back of the 
> catalog has breadboards, enclosures, power supplies, etc.
>
>73, Gordon KJ6IKT
>
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