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- The type SY4307A is the STC version of the Western Electric 307A, a power output pentode possessing a similar power rating, but significantly different characteristics to the far more common type 807 thermionic valve/vacuum tube. The "SY" prefix denotes the site of manufacture as being Sydney. The plant, operated by Standard Telephones and Cables Pty. Ltd. was located on Mandible Street in the suburb of Alexandria and existed under that corporate entity from 1937 to 1970.. Although the remaining structure postdates the depicted device, this device was likely assembled on an adjoining property upon which the structures have been demolished and site re-purposed. Electrically equivalent devices marked "307A" were manufactured in North America by Western Electric and these possibly predate the Australian version. (en)
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- Standard Telephones and Cables/Brimar brand Australian Pentode, type SY4307A, c1940 (en)
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- Power Output Pentode (en)
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- American 5 Pin, (en)
- Pin 1, Heater/Cathode (en)
- Pin 2, Screen Grid, g2 (en)
- Pin-3, Control Grid, g1 (en)
- Pin-4, Suppressor Grid (en)
- Pin-5, Heater/Cathode (en)
- Top Cap, Anode/Plate (en)
- with side locating pin between pis 1 and 2. (en)
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| rdfs:comment
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- The type SY4307A is the STC version of the Western Electric 307A, a power output pentode possessing a similar power rating, but significantly different characteristics to the far more common type 807 thermionic valve/vacuum tube. The "SY" prefix denotes the site of manufacture as being Sydney. The plant, operated by Standard Telephones and Cables Pty. Ltd. was located on Mandible Street in the suburb of Alexandria and existed under that corporate entity from 1937 to 1970.. Although the remaining structure postdates the depicted device, this device was likely assembled on an adjoining property upon which the structures have been demolished and site re-purposed. (en)
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