"Wherever possible in Elektor circuits, transistors
and diodes are simply marked `TUP`
TDD TDD (Transistor, Universal PNP), `TUN` (Transistor,
Universal NPN), `DUG` (Diode, Universal Germaniuml
or `DUS` (Diode, Universal Silicon). DUD DUD- This indicates that a large group of similar
devices can be used, provided they meet the
minimum specifications listed in tables 1a and DU5 1b.
For further information, see the article `TUPTUN-
DUG-DUS` in Elektor 1, p. 9."
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