Repairing an old radio receiver may be an interesting weekend project, but it’s worth knowing what you’re facing. Especially in the case of vacuum tube electronic equipment, running the elf in the circuit is not always a simple process (in addition, please pay attention to the high voltage in the old vacuum tube equipment). (Mr. Carlson) has the knack of making old radios hum again. His repair of the general electric barn find radio receiver in the 1960s is a master course in the field of old electronic equipment repair.
Seriously, if you have 90 minutes of free time, this video (after rest) is a complete and complete start, which can complete the diagnosis and maintenance of an old radio, which is absolutely necessary for anyone interested in doing so.
The barn discovery radio does show its age. Not long ago, circuit tests found a disconnected filament in one of several vacuum tubes, but the radio remained stubbornly silent. Further tests showed that the IF transformer did not meet the specifications and needed maintenance and calibration. After fine tuning the if and RF parts of the radio, the situation really looks (sounds) better.
Fine tuning various parts of the radio greatly meets its “remote” requirements. At the end of the video, it is almost impossible to find dead gas on the AM panel of the radio. If you’ve never tweaked the receiver, especially this year’s receiver, this video will provide all the details you need. When the circuit board is exposed, [Carlson] is also responsible for some preventive maintenance, including replacing the original filter capacitor with newer components and replacing the power safety capacitor with safer modern alternatives.
We can’t get enough repairs, so be sure to check out our detailed report on repairing World War II aircraft radios.