I do not know which were the first devices that SGS made. They may have started, like most others, with silicon point-contact microwave diodes for radar. If so, I have not found evidence or data for them. The 1961 D.A.T.A. book listed above shows three groups of products:
- germanium diodes in the 1G series. The image on the right shows 1G58, a miniature glass type. The letters SGS are printed under a geometric shape described below.
- many silicon diodes in the 1S series. The image on the right shows 1S538, a rectifier.
- 1SV120 and 1SV130 diodes, about which I know nothing.
If you have information about any of these three groups of diodes, please
I'm also unsure of SGS' first transistors. The 1962 D.A.T.A. book listed above shows:
- a series starting with 2G108 and ending with 2G1027 with many gaps. These are quite distinct from the Texas Instruments (UK) 2G types.
- a limited number of 2N series types.
This image shows the 2G108. It has the same geometric shape above the letters SGS as the 1G58 diode. I have not found any reference to this being an early SGS logo.
Here is what I believe to be 2G271, although the '2G' is missing.
If you have original data for SGS transistors, please
I have come across other transistors such as this EF1 that I suspect are SGS 'hobbyist' types, although they are unbranded. There are a number of types: EC1, ED1, ED2, EF1, EF2, EIF1, EIF2, EIF11, EIF12.
If you have information about these, please
I have little original Ates data, and oddly, they do not appear in the D.A.T.A. books listed above. A fairly early, quite comprehensive, but badly organised data source is the 1966 Romanian book "Catalog de Dispozitive Semiconductoare" by Veronica Vătăşescu and Şerban Epure, which you can download from the Web. It lists the following ATES types:
I only have a few ATES devices, here is an AC191 in the standard TO-1 package. It is a germanium PNP AF type, possibly an output driver transistor.
And here is a rather corroded AUY35 which is a germanium PNP medium-power AF type in the TO-8 package.
This AD142 is a germanium PNP high-power AF type in the TO-3 ooutline. The high dome and the printed ATES in large letters cause me to suspect it is early production.
There was an Italian radio manufacturer called Condor Radioelettromeccanica S.p.A., Via Ugo Bassi, 23a - Milano. Their logo (shown) was the word "Condor" in an italic script. Occosionally, ATES power transistors can be found branded with this logo.
If you have original data for Ates devices, please
The only SGS-ATES germanium device that I possess as this AY105K diode. It uses a TO-1A can inside an aluminium cuboid heatsink, more often used by Telefunken for their transistors. In fact, the subscript K is short for the German word Kühlkörper meaning heatsink.
I possess few SGS-Fairchild devices: only the TO-18 transistor types C111, CS4 and V405A for which I have no data (or images).
If you have data for any of these, or other early SGS-F types, please
I possess no devices made by MISTRAL, also called 'microfarad'. As far as I know, they made the following:
- MFT101, MFT102 and MFT103 germanium PNP AF amplifier types
- MFT106, MFT107 and MFT108 germanium PNP IF oscillator/mixer types
- MFT121, MFT122 and MFT123 germanium PNP AF output types
If you know where I might find any of these, please