Creating a small, cheep and durable replacement for valves (vacuum tubes).
N\A, but probably akin to then Western practices.
|Designed in||Circa ~1960.|
|Transistors per chip||1.|
|Power supply||Low to medium.|
|Still in use||The cheep one was discontinued in 2012, but many continue in older appliances. All other types are still made.|
The TEWA TG50-TG55 type transistors worked as small power amplifiers low frequency, as switching transistors, control relays and so on. They had a medium to low power rating (allowable collector power dissipation 175mW, these transistors currently qualifies as a low-power). It was one of Poland's first moves in to the modern electrical business and it was seen as a national icon at the time.
- TG50 - basic transistor series, very common,
- TG51 - high voltage transistor,
- TG52 - for inverters
- TG53 - cheap, low-voltage collector
- TG55 - designed for inverters.
They were originally in irregular metal cases, then filled with blue-green resin, that were approximately like the Western TO-5 case in the TEWA corporate colour turquoise. The cases were later galvanized the case and finally used the official Western TO-5 and TO-30 type cases.
The more reliability 'professional' version was marked with a letter "S" after the type's usual designation code.
- http://www.mif.pg.gda.pl/homepages/jasiu/oldtr/TG50.html #http://www.radiomuseum.org/tubes/tube_tg50.html #http://www.wylie.org.uk/technology/semics/Poland/Poland.htm