File:Grundig-tk1luxus hg.jpg

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English: Tape recorder by Grundig (about 1950th).
The transistorized Grundig TK1 was manufactured in 1960-1963, as a portable, battery-powered entry-level tape recorder - alongside with the "serious" all-tube, mains-powered TK25/TK30..etc line. The TK1 weighed merely two kilograms (without batteries). Single speed 9.5 cm/s, around 15 minutes playback from the tiny reels. The TK1 had seven semiconductor devices and one subminiature vacuum tube - the DM71 "magic eye" indicator. The high voltage for the tube was generated via a winding of the bias/erase oscillator (sort of a "free" DC-DC converter). The batteries were strictly low-voltage, 6V for the electronics and 3V for the motor.
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Author Hannes Grobe

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current19:06, 16 April 2012Thumbnail for version as of 19:06, 16 April 20122,385 × 2,638 (1.08 MB)Hgrobe (talk | contribs)

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