Valve radio

Vacuum tube radio, is a product of the last century, along with the radio started immediately become the era of “to be bestowed favor on newly” due to the emergence of science and technology constantly development of the transistor, the 60 s and seventy s last century tube by powerful flood washed away the transistor, the rich people’s life in the ninety s had to know the voice and returned to the vacuum tube radio (sound) in the wonderful sound.

Introduction to the history

On January 23, 1923, the American founded the China Radio Corporation in Shanghai, broadcasting radio programs, and selling radios at the same time, with the Most produced in the United States, its types: one, is the ore radio, two, is the valve radio.

When the Republic of China (last century 20 ~ 30’s) also called vacuum tube radio.

Since the radio began, the north called it a chatterbox. The adjective used to describe a person is used figuratively in this new thing. Ore radio (southern fashion popular called valve radio “bile machine”).

How a tube radio works

Ore radio

The antenna is connected with the ore, earphone and ground wire (the radio can be found by adjusting the metal needle of the ore).

Radio line

Each child peja make single machine with triode, disrelish the volume is too low, can’t meet the requirements, general amateurs reward will be multipolar new vacuum tube instead of single pipe, each have surprised, here has introduced 2 a5, 33 powerful single pipe receive hear ‘on-shore stations, all can use the horn sounds, its volume is not triode compared with single pipe bender can. Then introduce a circuit using 58 high amplifier to do detection, its volume is very large, and the sensitivity is higher than using 2A5, 33, because 58 is a high amplifier. In order to save the equipment, the half-alternating current is adopted, and the filament current is supplied by the ordinary bell square instead, and the voltage is two. Five volt dozen (now called volt), the current is an ampere, b with 135 volt dozen can be, such as added to 180 volt dozen its volume can be increased.

LL1L2 as ordinary three loop circuit diagram, using variable variable capacitor C1 (also can use push pull adjustment) C and C1. 00 to five variable capacitor, R is two million to four megohm, R.F, C is broadcast with the high frequency of choke coil pick b aGS electrical variables of the high pressure and with six thousand ohm resistance R1 adjustment of consumption, can improve the sound quality and volume to the best, If there is no consumption resistance adjustment, it can be connected to the 90-volt or 135 volt, in short, the GS voltage is too large, the sound will be choked, too low side sound light and poor quality.

For the welding of 58, cathode grid Sn is connected to cathode C, the cap is a volume regulator for the control grid connected to 6000 ohm, the cathode is connected to b negative, and the rest are connected to triode, but the hot wire H cannot be connected to B due to the use of alternating current.

The antenna loop of this machine is up to twelve laps, many are not selective, I have been in Wusong with indoor antenna to listen to Shanghai Nanjing each size radio station, day and night field can put sound in the loudspeaker, if the use of outdoor antenna, the results will be better.

This machine when can be changed to full flow, rectification with 82,80, etc., like assembly and disassembly comrades, may wish to try.

Radio receiver

Lin Guiling see jun Ming duct supporting for the radio player meet performance device, “the authors a generic one, but suffer from lack of another piece, not the third, it will transform it for a moment, the other a completely take on the old radio, according to test results, performance is not poor, meet in a homemade agency communication five pipe bender, pronunciation is extremely loud. With the ground line radio station in the port of more than one hundred watts broadcast similar to the single connection in the detection tube grid road, to a lot of superior sound.

Friends with the disease – comrades suffering from the bondage of another – may try it at leisure.

Here but a kind of reference, hope comrades with your wisdom to a lot of improvement, perhaps have better results found?

Parts list:

C 0005MFD variable capacitor;

C1 2MFD fixed capacitor;

R 750 ohms fixed resistance;

V 33 strong output tube;

L L1 2 1/2 “with 20 enameled wire, make 100 turns L1 at one end of the 50 turns to be ready for electric connection. Make 15 turns 1 minute from L1 with the same wire as L.

A Electric two volt (volt);

B One hundred and thirty-five francs dry.

The development of valve radio

On The evening of January 23, 1923, the first private radio station in China started broadcasting in Shanghai, jointly organized by Osborn, an American radio businessman engaged in telecommunications business in China, and the English continental News. It broadcasts one hour every night, with domestic and foreign news and Shanghai news, but mainly entertainment programs, with religious programs such as “Sermon” and “Prayer” on Sundays. In order to promote radios, the station also held talks on radio basics. As the establishment of the station was not approved by the relevant authorities of the Chinese government and violated the laws of the Beijing government, the Ministry of Foreign Affairs of the Beijing government sent representatives to make repeated representations, and the station was soon stopped broadcasting.

The 20th century is an era of rapid development of human science and culture, and radio has become the symbol of the era. In terms of design, radio gradually got rid of the burden of neoclassicism at the end of the 19th century and began to move towards modernization. Developed a style between classical and modern, later known as “Art Deco style”.

Norman Bel Geddes (1893-1958) was one of the early masters of industrial design who explored the art of radio.

Working principle of valve radio The development of valve radio

Peanut tube radio

The advent of the peanut tube in the 20th century made radios smaller (tubes with points on top). Portable radios also appeared.

Even today, small tubes are still used, especially the high-end brand of tube amplifier is very popular.

Valve radio

In the 50’s and 60’s every family put this new pet in the middle of the living room as a symbol of wealth. But the junction transistor came along in 1950. The giant sent the valve radio straight to the museum.

In the 1990s, people’s life improved, recalling the wonderful sound of the electronic tube circuit, making this “old thing” a fashionable and luxurious leisure product.

What is the circuit diagram of the valve radio

Vacuum tube radio, is a product of the last century, along with the radio started immediately become the era of “to be bestowed favor on newly” due to the emergence of science and technology constantly development of the transistor, the 60 s and seventy s last century tube by powerful flood washed away the transistor, the rich people’s life in the ninety s had to know the voice and returned to the vacuum tube radio (sound) in the wonderful sound.

Working principle of valve radio The development of valve radio

The size of capacitance is marked like this. The electroless capacitor is commonly used in several micro methods, mainly used in the starting of a single motor, as the starting capacitor. On the electron tube radio, the coupling capacitance is generally used in a micro method, that is, zero or a few micro methods. If used in filtering, generally in dozens of micro method above. The carry of the capacitor is million carry, which is a million pictograms equals one microgram. The capacitance mark you give, 1000 is 1000 picograms, usually marked 1000P

This is a typical AC regenerative radio circuit, using peanut tube 6J1 regenerative grid detection, 6P1 amplifier, 6Z4 rectifier. If the large octagonal pipe is changed to 6SJ7GT, 6V6GT and 5Y3GT respectively. 6J1 can also be replaced with 6J2, 6K4, etc. This circuit adjusts the regenerative use of variable capacitor, for 6J1, 6SJ7GT pentode, can also be changed to adjust the screen gate voltage potentiometer.

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