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#1
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amio g-200
i am working on an ami g-200. my problem is i have a louder than normal hum while playing the record. amp does sound very good. i took the wire off to the extra speakers and the hum quit. sound isnt quite as good due to loss of speakers. my question would the problem be with one of those speakers, capacitors in the box its wired to or still in the amp itself. your thoughts please. norm
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#2
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amio g-200
On May 14, 11:45*pm, wrote: i am working on an ami g-200. my problem is i have a louder than normal hum while playing the record. amp does sound very good. i took the wire off to the extra speakers and the hum quit. sound isnt quite as good due to loss of speakers. my question would the problem be with one of those speakers, capacitors in the box its wired to or still in the amp itself. your thoughts please. *norm Depends on what you mean by extra speakers: A) If you have simply disconnected one of the machine's internal speakers (woofer), then that will stop you hearing the hum, as that is the only speaker in the machine capable of reproducing mains hum. The hum will still be coming out of the amp though. It is filtered out of the horn speaker on top by that metal box that has the filtering components. B) I presume you mean speakers outside the machine that you have connected up ? Maybe they are overloading the amp, if too many, or they or their wiring have problems (see below) and the filter caps are weak and not sufficient to filter that higher load (but in that case hum should increase with volume ?) -That the extra speakers are somehow on the wrong terminal on the amp, or there is a bad earth inside the amp on the speaker terminals and the speaker leads act as an antenna for the hum ? Partially shorted speaker leads (or even speaker voice coil) may do this, increase the load on the amp but not the volume. (you have to turn the amp up higher to get same volume level as before). -Are the speakers connected to anything else outside the jukebox, like a stereo system via a speaker switchbox, (switches a speaker or pair of speakers between 2 different sources (amps) ) that only switches one of the 2 speaker leads for example, and there is an earth being made back to the other device that drives the speakers, or is the other device somehow pushing its own hum back down the speaker leads that is then coming out of the existing speaker in the juke ? Unplugging the G's amp from the mains supply may determine this. If it continues, its not the juke amp. (note, both devices may be ok on their own, but form a hum circuit when one lead is joined.) -Crazy but I have seen it done - a guy using a water pipe, house metal framing or beam as an earth, and running a single wire to the other side of the load - in this case a fencing wire that passed through wooden posts. -Are the speaker leads accidentally shorting (frayed) somehow to metal such as water pipes, metal beams etc or the wire has been stapled, and the staple has managed to pierce the insulation of the wire, and short it to the above, or some other wiring in the building. Seen this happen once with a telephone line and 70v speakers driven from a jukebox in a bar. |
#3
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amio g-200
On Monday, May 14, 2012 8:45:55 AM UTC-5, wrote:
i am working on an ami g-200. my problem is i have a louder than normal hum while playing the record. amp does sound very good. i took the wire off to the extra speakers and the hum quit. sound isnt quite as good due to loss of speakers. my question would the problem be with one of those speakers, capacitors in the box its wired to or still in the amp itself. your thoughts please. norm thanks for the info. i am talking about the two smaller ones in the machine. i have ordered a rebuild kit for the amp as i thought it still might be the problem but ws hoping there might have been another solution. thanks norm |
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