Manley MIC EQ 500 Combo Owner's Manual
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OPERATIONAL NOTESSWITCHING ONThe power switch is located on the right hand corner of the front panel. Flip the switch up to turn on thepreamplifier and down to turn off the preamplifier. Do not flip the power on and off rapidly or you may damage thebridge rectifiers in the power supply.RUNNINGIt is not recommended that you leave your preamplifier permanently switched on. This only wastes electricity andtube life. Your preamplifier has solid state rectification and reaches peak operating condition in approximately 30minutes.RACK MOUNTINGMost owners of this unit will choose to mount the unit in a rack. There are several major concerns. First isventilation. You should allow clearance above and below the unit. Do not mount the MIC EQ-500 COMBO in a2U flight case as this will not have enough ventilation. The result will be a short working life of the unit. Anothergood reason for clearance above and below is minimizing hum. Some gear radiates hum fields and it is possible forthis unit to pick up the hum and amplify it. Grounding can also be a concern. Other gear screwed to the metal rackrails serves as another ground path. The ground terminals on the back panel may help. Lastly if the unit will beportable then you may want a shock mounted rack. The 1/4" aluminum front panel is about as good as it gets forstrength and the unit is not too heavy in back but the tubes are can become microphonic as a result of vibration.TUBE LIFEAs with all tubes, their quality degrades with age. This is due to cathode emission, a natural process found in alltubes. We recommend that you have your preamplifier checked every 4-5 years, depending on usage. An excessiveincrease in noise level can indicate the need to replace a tube. The most likely candidate for a noisy tube will be theshorter ones as they are used as first stage preamps and have the most gain.HUMThis unit is meant to use the third pin of the mains as the ground reference. The GROUND TERMINALS are onemethod to reduce hum. Verify that the two terminals are connected with the ground strap or that the hum is lesswith the strap off one terminal. If all else fails try a three pin to two pin AC adapter rather than break off the ACground pin. More than likely it is the mic or mic cabling at fault.Another source of hum can be equipment stacked on top of one another. This is not a good plan from theventilation standpoint generally and it is likely to introduce hum, buzz or noise into the system. Certain gearradiates magnetic fields or high frequency noise around its chassis and other gear may be prone to receiving thesefields. Distance helps greatly.Transformer isolated balanced inputs and outputs are most immune to ground problems. Cutting the shields ateither the source or destination may help but not on the MIC PRE INPUT. Here the shield is required for phantompower and providing a shield for the microphone. These balanced inputs and outputs will interface to unbalancedinputs and outputs automatically. This is a prime benefit with transformers. The internal meter may have to bedisregarded when feeding -10 dBu inputs.Locating the MIC EQ-500 COMBO close to the mic is advisable in some situations. Most mics are not great atdriving long cables. Not only can noise and hum be reduced, but signal fidelity is often dramatically improved.The downside is having to run out to the studio to adjust a control. One should not really have to be re-adjusting thecontrols of this unit every few minutes. If a compressor is patched between the MIC EQ 500 COMBO and the tapemachine then the engineer has adjustment of level to tape at arms reach without resorting to patching the signalthrough the console. |
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