MARIO VASQUEZelectronica

34

hace 6 años

Hi Juan Francisco, I have dealt with this fault a lot and there is a good variety of possible causes, defective outlet tube, defective output transformer, bad connection, sometimes I have found that a simple defective volume control is the cause, but for not walk blindly, divide the RF and AF radio into two sections, and with a signal injector and an amplifier, test them separately, because the fault may also be that the radio frequency signal is very weak, test in the control of volume that give hard whistles the amplifier when touching it etc.

Juan Francisco chico

2

hace 6 años

Hi Mario, I play the potentiometer and it does nothing, the filter capacitor is 50 + 50,450v but I only use one only if I answer the other one the radio does not sound

tony1.9diesel

878

hace 6 años

Change the capacitor and cathode resistor of the EL84 valve, you can do a test to not disassemble anything at the moment; bridge a second between the terminals of the EL84 cathode resistor with a cable if the sound is suddenly heard loud is that resistance is open and hence the sound is heard low because the cathode would be working only thanks to the condenser and it would not be enough, you must replace it