I would really like to know what these are before I start playing around with them, tried to translate everything and can't find a thing — then again they say made in the USSR (СССР) so maybe no one knows?
МБГО -2
1 мкФ±10%ОТК
300В 87 079
СДЕЛАНО В СССР [Made in the USSR]
(Transcription of the small one only.)
Best Answer
From this page (in Russian), we can find that:
1 мкФ is the Russian equivalent for 1 μF, while 300В means 300V. ±10% means that actual capacitance is within 10% of the nominal value.
If you try to search for description of Soviet parts on the Internet, you may want to look for Russian-language pages with the keyword of "маркировка", which means "marking", and use Google Translate to translate them into your language.