residences near radio transmitters) Try enclosing the cable in a large diameter braid earthed to the arm or pre-amplifier. To eliminate this possibility you can swap channels if the problem is only on one channel and hear the result or you can substitute the cartridge or arm if possible. Fault Within the Cartridge or the AmpĬartridges can sometimes develop hum as can amplifiers. If it works then you can figure out a way of linking the two points more permanently – like wrapping the wire around the phono plug and then using tape to hold it on. Phono Stage and Amps which are designed with 0V earthedĪs an experiment, try just holding the bared ends of a wire between the outer conducting rim of one of the phono plugs ( while plugged into the phono stage or amp) and the earth terminal of the amp – some amps ground signal return to the earth and this technique cures a hum problem. You can experiment with attaching and detaching earths – particularly if you have a pre-power combination – sometimes it is best not to link the two together by an earth wire. The only solution is either to change the cartridge or use a DC motor. Grado cartridges are unshielded and this can cause problems with A/C turntable motors which kick out quite a strong magnetic field. If you are using a moving magnet cartridge make sure that the phono stage setting is correctly set for moving magnet input and vice versa for a moving coil cartridge.
This exercise can often solve the problem. You can often hear hum levels change when you start moving equipment positions and the same is true when you change the orientation and positions of tonearm and phono stage interconnect cables. Mains cable or transformers and amplifiers in the vicinity of low level signal cable can easily cause hum so ensure the arm cables and any phono stage interconnects and phono stage are spaced well away – you will hear hum diminish as they move so you can judge how far is safe enough. If the following list does not identify or solve the problem, please refer to the section much lower down page on “One channel down and no sound coming out of one speaker or hum problems” – section (e). However before trying to fix or return the arm to us, it is worth listing the other causes of hum – this list is not exhaustive. From time to time there is an internal wiring fault that may develop which causes hum – this maybe something you can rectify. We test all our arms and rewiring jobs for hum before they are dispatched, however faults can very occasionally develop in transit, fitting or subsequent use. Spares & Upgrades for Origin Live Products.
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