Keywords: 4x150a-top.jpg Kühlkörper einer Senderöhre self-photographed 2008-01-16 Herbertweidner at http //de wikipedia org de wikipedia PD-release Original upload log page de wikipedia 4x150a-top jpg 2008-01-19 11 11 Herbertweidner 300×238× 15567 bytes <nowiki> Andere Versionen </nowiki> Vacuum triodes |