Your phono input may be making a noise due to a variety of reasons. It could be caused by a ground loop, which occurs when there are multiple paths to ground in the audio system, resulting in interference and noise. Another potential cause could be a faulty or damaged cable, which can introduce interference and cause noise in the signal. Additionally, the noise could be a result of a problem with the phono preamp or the turntable itself. It's important to troubleshoot and identify the specific cause of the noise in order to address and resolve the issue. **

The crackling sound in the phono grounding cable could be caused by a few different issues. It could be due to a loose connection or a damaged cable, which is causing interference and creating the crackling noise. It's important to check the connections and the condition of the cable to identify and resolve the issue. Additionally, using a different grounding cable or cleaning the connections may also help eliminate the crackling sound. **

To determine if the phono aux input is not working, first check if the input source is properly connected to the phono input on the device. Ensure that the correct input source is selected on the device and that the volume is turned up. If the issue persists, try using a different audio cable or testing the input with another device to see if the problem is with the input or the source. If the phono aux input still does not work, there may be a hardware issue that requires professional inspection and repair. **

The main difference between Line and Phono inputs is the level of signal they are designed to handle. Line inputs are designed for devices that output a higher level signal, such as CD players, tape decks, and other line-level audio sources. Phono inputs, on the other hand, are specifically designed for turntables, which output a much lower level signal that has been equalized to compensate for the characteristics of vinyl records. Phono inputs also apply a specific equalization curve called the RIAA curve to the signal, which is necessary for accurate playback of vinyl records. **

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Yes, there were GDR radios with a phono input. These radios were designed to allow users to connect their record players or other audio devices with a phono output to the radio for playback. The phono input on these radios allowed for a direct connection, providing a convenient way to listen to music through the radio's speakers. **

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The symbol on the left represents a ground connection, indicating that the phono preamplifier should be properly grounded to reduce interference and noise. The symbol on the right represents a power connection, indicating that the preamplifier requires a power source to operate. These symbols are commonly found on audio equipment to provide guidance on how to properly connect and power the device. **