Tuned RF power amplifier
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Autor/-in unbekannt
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Größe:
825 x 1085 Pixel (161707 Bytes)
Beschreibung:
A tuned RF amplifier module for a radio transmitter, from an advertisement in a 1938 radio magazine. This consists of two power triode tubes and a tank circuit consisting of a high Q coil (top) and a variable capacitor (center). The promotional copy said it was usable up to 27 MHz.
Kommentar zur Lizenz:
This image is from an advertisement without a copyright notice published in a 1938 magazine. In the United States, advertisements published in collective works (magazines and newspapers) are not covered by the copyright notice for the entire collective work. (See U.S. Copyright Office Circular 3, "Copyright Notice", page 3, "Contributions to Collective Works".) Since the advertisement was published before 1978 without a copyright notice, it falls into the public domain.
Lizenz:
Public domain
Credit:
Retrieved March 12, 2014 from Radio News magazine, Ziff-Davis Publishing Co., Chicago, Vol. 20, No. 11, May 1938, p. 31 American Radio History website
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© Raimond Spekking / CC BY-SA 4.0 (via Wikimedia Commons)
© Raimond Spekking / CC BY-SA 4.0 (via Wikimedia Commons)
(c) DavidG, CC BY-SA 3.0
(c) I, Kaneiderdaniel, CC BY-SA 3.0
(c) Elcap, CC BY-SA 3.0
(c) Elcap, CC BY-SA 3.0
(c) Elcap, CC BY-SA 3.0
(c) Elcap, CC BY-SA 3.0
(c) Elcap, CC BY-SA 3.0
(c) Ulfbastel, CC BY-SA 3.0
(c) Elcap, CC BY-SA 3.0
(c) Ulfbastel, CC BY-SA 3.0
(c) Mæx, CC BY-SA 3.0
(c) Elcap, CC BY-SA 3.0
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