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instead of plugging your turntable into "phono in" on the amp just try a regular auxilary input like aux ,video, or cd. sounds like the turntable output isnt like the old ones and may be just a regular output.
If you have replaced the cartridge then it must be the cartridge pre-amp that is faulty. If there are any other functions on the device such as CD, then it will not effect them. Unless there is crackling on any other function then the pre-amp has a problem. The pre-amp itself is generally a single IC. You can find it by following the turntable connection back to the inside of the amp. The signals will pass through the IC before being passed to the main pre-amp.
A turn table produces sound voltage in the millivolt range. If you have it connected to a receiver that has a phono input and the turn table is pre-amplified, you are overdriving the receiver and it is clipping the audio and making it sound bad.
If you can hear music with the volume up, but like it was turned down low (from the power amp), then yes there is something up with it. If it's the same on both left & right channels, then it's something common to both. For instance the power supply, or an IC that has both channels going in it.
If however the power amp does produce sound normally with another device, then either the turntable has a fault, or the pre-amp has, perhaps on the pre-amp inside it for the cartridge.
You need to get a pre amp for your turntable. The 5740 does not have one built in. Not to worry, they are actually inexpensive! Google pre amp or turntable pre amp & you will find lots of good units that will do the trick for 25-45. They also give you an input ground to get rid of that lovely turntable humm. Hope this helps
check the continuity in your cables. you will need a multimeter or something else to check the cables. the multimeter is about $10 or so. other than that, make sure that your turntable is actually giving output and that the pre amp is both recieving and sending(same with the regular amp. and make sure that the levels are up on everything and the speakers connected properly etc. you probably know this already, but sometimes a good, friendly reminder helps. good luck!!
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