Question about VOX AGA-150 Acoustic Guitar Amplifier

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Had this aga150 amp for about a year. Its been fine, a little bit clippy but fine for practice. Now sound is almost completely gone. It came back for a bit then gone again. Help!!

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Playing bar chord at A 5th fret fine move to 7th fret amp gets loud and pops. normal gain at 3 to 4 volume dwn wont do it


Sorry I remember now this is a solid state amplifier,
try electronics spray contact cleaner in the pots of the amp, you will need to unplug and remove the chassis of the amp to do this, there are little notches on the pots, that's where you want to spray, and work the nob back and forth completely, do this to all volume, treb, bass, etc... I know this will fix your problem because I have done this about 100 times servicing amplifiers, the way a solid state circuit works if the pots are dirty the circuit doesn't complete properly causing volume issues, really hope this helps?

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Hi, after doing a bit of googling it occurs to me that the internal speaker is ONLY for the metronome / click & not for the drum sounds themselves. You will need headphones or some external audio gear like your hi-fi system or oth r amp & speaker. I found this "The pad has 54 sounds in it (covering all parts of the drum kit but mostly snares), which are triggered when you hit the mesh head, but these can only be heard over headphones. The built in speaker is only used by the metronome sound (when there are no headphones attached) and then it only has a beep sound attached to it. However, plug in headphones and you get a variety of available click sounds including a proper ticking clockwork metronome." Hope that helps a little? Good Luck :-)

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In a word, NO. Changing type of strings might make it a bit louder, however the sound quality would drastically change if it does. Best to leave alone... Get a small amp, portable battery if needed... OR there are headphone amps that are designed to be used for practice.

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Wireless guitar system was working fine for about 2 hours & then the transmitter would have to be turned on again & again every few seconds to continue playing. this system is practically brand new...


This has the earmarks of battery problem... Supposedly this uses a 9 volt battery... You CANNOT use rechargeable batteries in these as the actual voltage of the rechargeable is lower than alkaline and they will fail quickly and as they age you may get only seconds of operation. When they go off the battery will recover a bit and even look like it comes on again. Do NOT count on the battery LED to give actual answer. When you turn on the unit, read the battery voltage under load with a meter. It should be at least 8.5 volts. NEXT possibility: A chronic problem with body packs is the battery contacts. There is a fine line between having good contact and being able to get batteries out. I have seen where people stuff paper in to increase tension on the contacts.

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1 Answer

When i play my bass through my amp it is really loud but when i go round my tutors for lessosns he has to turn his amp way up to get any sound at all.


His amp probably has lower gain. They vary quite a bit. Also the size of the speaker will affect it a bunch. If his is a tiny practice amp your bass will not generate much noise.

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Suddenly the monitor one output jack has no sound. If I turn the Monitor one slider all the way up I can hear a very low sound with distortion. The monitor output works fine.


Make sure the appropriate channel rotary knob MON1 knob is turned up for the channels you want into MON1. ALSO test other channels if they can be sent to MON1. The MON jacks are TRS with the tip as the hot and the sleeve as resistor to ground.

Hopefully you have used good practice and have ALWAYS powered whatever you are driving from the MON1 out from the same receptacle as the PMP5000. If not, ground bounce MAY have destroyed the driver in thee PMP5000. They USUALLY don't tell you these things in the user manuals, so it is up to us electricaal engineers to educate.

FIRST plug in a set of headphones and see if sound comes out (it will only be one side and fairly low volume, usually the left). If it does, then cabling and whatever amp you have for the MON1 has a problem. I have schematics and can help you troubleshoot a bit.

Also PLEASE read the tip I have posted on here about a grounding hazard of the A channel when using Speakon to 1/4 inch cables.

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Keep us posted.

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1 Answer

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Hi a couple of years back I had a similar problem. Remove the chassis, you will see a wire (might be blue) it is quite noticeable (looks like a jumper a few inches long). It controls channel switching. Check it for dry solder or broken at either end. Good luck, Dereeldeel

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