Tungsram logo I have very little information about the early manufacture of semiconductors in Hungary. The long-established electrical manufacturer Tungsram, famous for the production of electric lighting, produced germanium transistors in the standard pro Electron series AC, AD, AF and possibly others. They also produced transistors in the Mullard/Philips OC series, and diodes in the OA and AA series. I have no data books or sheets describing any of these.

If you can provide more detail about this, please


AC125 transistor Here is a Tungsram AC125 in the TO-1A package. This common type is a PNP germanium alloy transistor for AF pre-amplifier applications, equivalent to the Mullard OC70 or OC71.


OC1077 transistor OC1079 transistor Tungsram made germanium transistors in the Mullard OC series, but for many of them they added 1000 to the part number:

  • The OC1079 on the right is equivalent to an OC79.
  • The OC1077 on the left is equivalent to an OC77, but uses the smaller TO-1A can.

They also did this for ASZnn and possibly other pro-Electron series types.

If you know anything about this numbering, please


wanted transistor I have an old Hungarian transistor list from 1960 and it mentions two unusual Tungsram types: the P14 and P15 are apparently low-power PNP germanium RF transistors. Unfortunately their encapsulation is not shown.

I am interested to find out more about these, and if possible obtain examples. If you know anything about them, please


I have little more to show in the way of Hungarian semiconductors. Please help fill this gap if you can!






Valid XHTML 1.0 Strict