Hello that such friends I have an old radio that does not tune any modulated amplitude station I thank you for a tip
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Old Electronics
Old radio does not tune am
3.081
hace 5 años
For this repair it is not enough only with the multimeter. An amplitude modulated RF generator is required to verify operation from the antenna to the speaker. A frequency meter is also needed to verify the operation of the local oscillator, if an oscilloscope is not available. Logically, the ideal instrument was the dynamic analyzer, widely used at that time, which allowed tracking the transmitter signal from the antenna to the speaker.
1.609
hace 5 años
hace 5 años
Hi, I don't know if your radio has f, m. if it is of the type radio recorder, or only a radius of am. Please resolve this question to try to answer.
1.609
hace 5 años
well then it starts in the swich that separates the fm from the am and the turntable. one more question do you have sound in fm, if you have it check voltages on the fm am key
1.609
hace 5 años
Dear Joshe. what you have is a brain of an antiquity that in Mexico we called console. the fault is made by the am fm and phono key, which you add to give you the functions, you must draw a picture of all the connections that are welded, then carefully desoldes their place and carries very small nails on the sides they stop the vaquelita lid close them remove the piece, inside it brings a kind of skates that join between one leg and another carefully disassemble one by one clean them again and test. also check that you have an antenna connected to the back screws
hace 5 años
hace 5 años
Regards. first look at the variable capacitor to see if its plates are making short, if not, then look at the stage of the first intermediate frequency amplifier (resistor coils and capacitors) the armored coils you should check them without having to risk uncovering them if you do not see it necessary, then Do the same with the second stage and, finally, also the same with the third stage, if you do not see anything abnormal there, then there is a problem with the tube that is responsible for detecting, that tube would be the one that is forming the circuit which follows the carrier coil or quartz crystal of 455 Kilohertz or Kilocycles, it is very easy to identify by that location, you take the number of that tube or valve and look for the characteristics on the WEB. I hope you serve my suggestion that can lead you to a direct solution. Greetings from Los Teques, Venezuela
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