[Tube Radio]How Tube Radios Work The History of Tube Radios
Tube Radios
Tube Radios, It is a product of the beginning of the last century. With the launch of the radio station, it immediately became the “new favorite” of that era. Due to the continuous development of technology and the emergence of transistors, the electron tubes were swept away by the powerful torrent of transistors in the 1960s and 1970s, and people lived in the 1990s. Rich got an understanding of sound, and went back to the wonderful sound of a tube radio (sound).
History
On January 23, 1923, Americans founded the China Radio Company in Shanghai to broadcast radio programs and sell radios, which were produced in the United States The most, its types: one, is the ore radio, two, is the tube radio.
In the Republic of China (20-30s of last century), it was also called vacuum tube radio.
Beginning with the radio, the North called it a chatterbox. The adjective that originally meant a person was used vividly in this new thing. Ore radio (southern fashion and popular call tube radio as “tube amplifier”).
How tube radios work
Crystal radios
Using an antenna to communicate with ore, headphones, ground Line connection (adjust the ore’s connection metal pin to find the radio).
Radio circuit
Zipei uses a triode as a single-tube radio, if the volume is too low to meet the requirements, generally amateurs will appreciate the multi-pole The new vacuum tube is changed to a single-tube machine, and the results are unexpected. The 2A5 and 33 powerful single-tube machines that have been introduced here can listen to various radio stations in this port, and can use the speaker to play the sound. The volume is definitely not that of a triode single-tube machine can compare. Introduce a circuit that uses 58 high-amplifier tube for detection, its volume is extremely large, and the sensitivity is higher than that of 2A5, 33, because 58 is a high-amplifier tube. In order to save the equipment, the semi-AC type is adopted, and the filament current is supplied by the ordinary electric bell square shed. You can hit it, if you add it to 180 V, the volume can be increased.
LL1L2 is an ordinary three-circuit circuit diagram, which is adjusted by variable variable capacitor C1 (can also be adjusted by push-pull frame), C and C1 are three or five variable capacitors of . , C is the highest voltage of the high-cycle choke coil aGS connected to B for broadcasting, and adjust it with a variable resistance R1 of 6,000 ohms, which can improve the sound quality and volume to the best place. If you do not need to adjust the resistance, then It can be connected to 90V or 135V of B. In short, if the voltage of GS is too large, the sound will be choked, and if the voltage is too low, the side tone will be light and poor quality.
The welding of 58, the cathode grid Sn and the cathode C are connected, the cap is the control grid connected to the 6,000-ohm volume adjuster, the cathode is connected to the B negative, the rest are connected according to the triode method, but the hot wire H, Due to the use of alternating current, it cannot be connected to B.
The antenna loop of this machine can be up to 12 circles, and the choice is not optional. I have used the indoor antenna to listen to various radio stations in Shanghai and Nanjing in Wusong. The sound can be played on the loudspeaker in day and night. Outdoor antenna, the performance can be better.
This machine can be changed to full AC type, 82, 80, etc. can be used for rectification. Comrades who like to assemble and disassemble may wish to give it a try.
Radio Receiver
After Lin Guiling read the article “Radio Recorder Receiver” by Ming Xiangjun, the author thought about imitating one. , I had no choice but to suffer from the lack of other parts, so I modified it, and the other parts were completely taken from the old radio. According to the test results, the results were not bad. It was connected to a self-made TRF AC five-tube machine. Pronunciation very loud. It is similar to the radio station with more than 100 watts installed in the local radio, which is much better than the single connection in the detector tube grid.
Friends with the same disease – comrades who suffer from being bound by another, – may wish to give it a try when you have time.
This is just a reference. I hope that comrades can use your wisdom to improve a lot, maybe you will find better results?
Parts List:
C 0005MFD Variable Capacitor;
C1 2MFD Fixed Capacitor;
R 750 Ohm Fixed Dissipation;
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V No. 33 strong output pipe;
L L1 2 1/2 inch pipe wound with 20 gauge enameled wire for 100 turns to make L1 and one end at 50 turns for connection to B power , and make 15 turns from L1 one minute with the same line as L.
A is two volts (volts);
B is one hundred and thirty-five volts dry.
The history of the development of tube radios
On the evening of January 23, 1923, Osborn, an American radio businessman who was operating a telecommunication business in China, and the English ” The first private radio station in China co-organized by the Mainland Daily started broadcasting in Shanghai. It broadcasts for 1 hour every night. The content includes domestic and foreign and Shanghai news, but it is mainly entertainment programs. On Sundays, there are religious programs such as “Preaching” and “Prayer”. In order to promote radio, the station also held lectures on basic common sense of radio. Because the establishment of the station was not approved by the relevant authorities of the Chinese government and violated the decree of the Beijing government, the Ministry of Foreign Affairs of the Beijing government sent representatives to negotiate many times.
The 20th century is an era of rapid development of human science and culture, and radio has become a symbol of the times. The design of the radio gradually got rid of the burden of neoclassicism at the end of the nineteenth century, and began to move towards the road of modernization. A style between classical and modern has been developed, which later generations called “Art Deco style” Art Deco.
Norman bel Geddes (1893–1958) was one of the early masters of industrial design who explored the art of the radio.
Peanut Tube Radio
The advent of the peanut tube in the mid-20th century made the radio smaller (the tube had a point on the top). Hand-held radios also appeared.
Small tubes are still used today, especially high-end brand tube amplifiers are very popular.
Tube radio
In the 1950s and 1960s, every family put this new favorite in the center of the living room as a symbol of wealth. But since the junction transistor came out in 1950. The giant sent the tube radio straight into the museum.
In the 1990s, people’s life improved, recalling the wonderful sound from the electronic tube circuit, making this “old thing” a fashionable and luxurious leisure product.
What is the circuit diagram of the tube radio?
The tube radio is the product of the beginning of the last century. With the launch of the radio station, it immediately became the “new favorite” of that era due to the continuous development of technology. Appeared, in the 1960s and 1970s, the tube was washed away by the powerful torrent of transistors. In the 1990s, people’s life became rich and they had an understanding of sound, and they returned to the wonderful sound of the tube radio (audio).
The size of the capacitance is marked like this. The electrodeless capacitor is generally used in a few microfarads, which are mainly used in the starting of a single motor as a starting capacitor. On the tube radio, generally one microfarad, that is, a few tenths of a microfarad is used on the coupling capacitor. If it is used in filtering, it is generally more than tens of microfarads. Capacitor carry is in millions, that is, one million picofarads equals one microfarad. The capacitance mark you gave, 1000 is 1000 picofarads, usually marked as 1000P
This is a typical AC regenerative radio circuit, using peanut tube 6J1 regenerative grid detection, 6P1 power amplifier, 6Z4 rectifier. If it is changed to a large octagon, it is 6SJ7GT, 6V6GT and 5Y3GT respectively. 6J1 can also be replaced with 6J2, 6K4, etc. This circuit adjusts and utilizes variable capacitors for regeneration. For pentodes such as 6J1 and 6SJ7GT, it can also be changed to a potentiometer to adjust the curtain grid voltage.
