antiqueradio.org: Zenith Model 1000 TransOceanic Radio Citat: "... Model 1000 was the first transistor-powered TransOceanic radio. Introduced in 1957, when transistors were still novel, it didn't instantly replace its tube-powered counterpart..."
cryptomuseum.com: Zenith 1000-D Portable short-wave receiver Citat: "...The Royal 1000 Trans-Oceanic was a portable solid-state LW, MW, and SW receiver (150 kHz - 22 MHz), also known as a world receiver, manufactured by Zenith in Chicago (Illinois, USA) and introduced in 1957..."
radiomuseum.org: Weltempfänger Zenith "Trans-Oceanic" Citat: "...Er beauftragte daraufhin am 2. August 1939 sein Labor, ein Gerät nach seinen Anforderungen zu entwickeln. Es wurden in der Folge etwa zwanzig (!) Prototypen gebaut, die er alle erprobte und verwarf, bis schließlich im Juli 1941 zwei Exemplare seine Zustimmung fanden. Das eine übergab er an den schon erwähnten Polarforscher McMillan, während er das andere Gerät nach Kanada mitnahm...", backup
radiomuseum.org: Magnavox model AW-100 Citat: "...The Magnavox model AW-100 is one of the first transistor multiband consumer radios if not the first - before the well known Zenith 1000. It has broadcast and 3 SW-bands..."
radiomuseum.org: Trans-Oceanic Royal 1000 Citat: "...There is an ad in "The National Geographic Magazine" 1957, December and we beleive the first Trans-Oceanic 1000 was introduced in November 1957..."
shortwaveradio.ch: Comet Pro Citat: "...Im Jahre 1931 brachte Hammarlung mit dem Modell "Comet" einen der ersten Superhet - Kommunikationsempfänger heraus...", backup
web.archive.org
shortwaveradio.ch: Comet Pro Citat: "...Im Jahre 1931 brachte Hammarlung mit dem Modell "Comet" einen der ersten Superhet - Kommunikationsempfänger heraus...", backup
Mar 27, 2015, wshu.org: Zenith Trans-Oceanic, The "Royalty of Radios" Citat: "...With the development of tubes in the late 1930s to support portability, McDonald came up with the concept of a portable shortwave radio that he could use while at sea on his yacht...By this time, the popularity of international shortwave broadcasts was growing rapidly...Starting in 1939, and continuing through the remainder of that year, no less than 20 prototypes were submitted to CEO McDonald for his approval...", backup
radiomuseum.org: Weltempfänger Zenith "Trans-Oceanic" Citat: "...Er beauftragte daraufhin am 2. August 1939 sein Labor, ein Gerät nach seinen Anforderungen zu entwickeln. Es wurden in der Folge etwa zwanzig (!) Prototypen gebaut, die er alle erprobte und verwarf, bis schließlich im Juli 1941 zwei Exemplare seine Zustimmung fanden. Das eine übergab er an den schon erwähnten Polarforscher McMillan, während er das andere Gerät nach Kanada mitnahm...", backup
wshu.org
Mar 27, 2015, wshu.org: Zenith Trans-Oceanic, The "Royalty of Radios" Citat: "...With the development of tubes in the late 1930s to support portability, McDonald came up with the concept of a portable shortwave radio that he could use while at sea on his yacht...By this time, the popularity of international shortwave broadcasts was growing rapidly...Starting in 1939, and continuing through the remainder of that year, no less than 20 prototypes were submitted to CEO McDonald for his approval...", backup
