Zeiss TK 35
Sound cinema case Zeiss TK 35 is a portable cinema projector unit for 35 mm films , which was manufactured by VEB Carl Zeiss Jena until the 1960s.
Applications
This mobile 35 mm film projector technology was used on the territory of the GDR. TK 35 was used in places where there were no permanent cinema facilities , such as in the halls of village restaurants or at open-air events and also referred to as country film there. The selection of films was organized by the state and was subordinate to the centrally controlled cinematography system of the German Democratic Republic's main film administration . This cinema projector unit existed until the fall of the Berlin Wall . Today some well-preserved specimens can still be seen in museums.
technology
The sound cinema case system consists of six individual cases (TK 35 projector, regulating transformer, amplifier, loudspeaker and two accessory cases, with all cables, connectors, lenses and film rewinding device).
The basic equipment of the DDR-Landfilmtechnik TK 35 includes two complete projectors, which enable a cross-fade operation and thus non-stop film enjoyment. A power supply unit and a tube amplifier, output around 25 watts with a loudspeaker box (2 × 12.5W broadband speakers) complete the system.
The system can be operated with mains voltages of 85 to 135 volts alternating voltage 50 Hz (110 V connection) or 195 to 245 volts alternating voltage 50 Hz (220 V connection). The total power consumption of the projector unit is around 700 VA . A fine adjuster on the switching device allows adjustment to the current line voltage while the machines are running. A concession to the grid voltage, which at that time was still strongly fluctuating in the GDR.
The film is driven by a Maltese cross gear , the lamp house with a light projection lamp with initially 75 volts and 375 watts (cinema adjustment base), later 110V / 750W, is laterally offset. Celluloid films could also be shown through the built-in heat protection filter made from special glass . The film cassettes are provided with automatically closing fire protection channels at the film passage points.
Various improvements were made during production. The respective version is given as the year on the nameplate. The first units had a belt drive (later a gearwheel) and a film channel that was not very film-friendly. The image sharpness could initially only be adjusted with the machine open.
In later years extensive alterations and improvements are made by the district film directorates. This included the conversion to halogen light (36V / 400W), as well as the replacement of the photocell (Pressler cell) for sound pick-up by a solar cell. The amplifier technology required for this was supplied by VEB Präcitronic Dresden with the Präciton P12. This was set up in the form of plug-in cards so that an output stage, for example, could be replaced in a very short time and largely without tools.
As a special feature, the sound amplifier unit had a typical cinema gong, as it is still played in some cinemas before the film. Tube amplifiers both with rectifier tubes (AZ12 + EL12) and later those with EL34 equipment were used.
Usually screens up to 4 m for normal images and up to 6 m for cinemascopes were used. A matching wooden frame for the canvas was part of the basic equipment. The Cinemascope version was called "Totalvision" in the GDR and required a lens attachment (anamorphic / rectimascop). The standard lens with 90 mm focal length could optionally be replaced by long focal length lenses (Kipronar 120mm and 140mm).
swell
- Instructions for use and technical data for ZEISS TK 35 sound cinema case system
Individual evidence
- ↑ Zeiss TK 35 (with pictures) on kinoteam.de
- ↑ Zeiss sound cinema case double system TK 35 operating instructions on oskino.de