Wherever poaibla in Elektor circuiu, transis- ton and diodes ara simply marked `TUP` (Transistor, Univar11I PNP), `TUN` (Transistor, Universal NPNI, `DUG` (Diode, Univenal Ger- manium) or `DUS` (Diode, Universal Silicon). This indicatas that a large group of similar devices can ba used, provided they meet the minimum specifications listed in tables 1a and 1b.
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