Description

 

Electronic Tube Radio 2 Channel Stereo FM Radio Tube FM Radio 87-108MHz Superheterodyne Receiving

Description:
This machine belongs to the typical superheterodyne radio. It adopts the design form of a whole circuit board, including high frequency reception, intermediate frequency amplification, limiting, frequency discrimination, stereo decoding, preamplifier, etc. The output is stereo sound signal. It can be equipped with various types of electronic tube power amplifier, active speaker, stereo equalization amplifier and other equipment. Specific circuit configurations are as follows: high-frequency reception uses bipolar 6N3 for high-frequency amplification and mixer amplification, bipolar 6N1 for local oscillation. Two-stage pentode 6K4, two-stage limiting and pentode 6J4 are used for IF amplification. The decoded audio signal is switched to the bipolar transistor 6N2 by the switch of the converter for 5 times pre-amplification. The output audio signal is fed to the power amplifier of two 6P1s pushed by a bipolar transistor 6N2, and the sound is restored by the loudspeaker.

Specification:
Shell material: aluminum alloy + stainless steel
Receiving band range: FM 87-108 MHz
Power supply voltage: 198V-242V
Channel number: 2 channels, stereo
Power consumption: 100W
Machine size: 374 x 240 x 140 mm
Net weight: about 8kg
Receiving form: superheterodyne
Output power: about 3W + 3W

Features:
-This machine has light weight, high receiving sensitivity, using electronic tube to receive FM signal, a strong sense of nostalgia, sweet voice, mellow, using potentiometer and varactor diode to tune, solving the trouble of using air capacitor to do cable drawing system.
-It adopts digital tube to display receiving frequency, and uses 6E2 to display receiving signal intensity, increasing visibility and ornamentality.
-The use of net cover design can prevent children from accidentally touching scalds and electric shocks. The panel is oxidized by CNC numerical control processing, and the shell is welded by stainless steel bending. So the cost is reduced.
-The knob is polished by CNC processing. The circuit board of the whole machine is made of 2mm thick PCB, which increases the mechanical strength and is not easy to be damaged.
-The power amplifier is installed separately and easy to be maintained.

Important Components:
Power transformer, electronic tube, high voltage filter capacitor, tuned resonant inductor, varactor, etc.

Function of Knob and Meter:

 

Use Steps:
1. Connect the antenna and connect the antenna connector with the external antenna. This machine comes with a SL16 connector. If you are in the urban area and the signal is good, you can connect a conductor about 2 meters on the antenna connector, and the radio can receive FM radio when it reaches out of the window. Of course, if you want to receive more radio signals, you must use an external omnidirectional outdoor antenna. The connection method of SL16 connector can refer to the connection method of CCTV signal.

2. Plug in the power cord that meets the requirements of the machine. The machine uses 220V voltage.

3. Connect the output terminal of the speaker with the input terminal of your speaker via the speaker connecting wire. Connect two groups of speakers, recommend using 4 inch to 8 inch full-frequency speakers for the best.
Note: Be careful! Do not use this machine without a speaker!

4. Turn on the power switch, the indicator will be light, wait for about 20 seconds to listen to the radio. Rotate the tuning knob (different radio signals can be selected), and the frequency meter will display the current radio frequency. The green indicator bar of the tuning indicator tube will close very tightly when the signal is best.

5. Turn off the power switch at the end of listening.

6. Children are not allowed to touch the electronic tubes and other components of the machine in order to avoid safety accidents. Please cover the net when not using the machine.

Probable Problems and Solutions in Use:
1. If the machine does not work, check whether the socket has power supply.
2. If the sound is low and the noise is loud, check if the antenna is not good, whether in bad contact.
3. If the radio has periodic noise, check whether there is interference from high frequency equipment around the machine.

Package List:
1 x Electronic Tube Radio