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HELP ME!! My amp is acting weird

W

whiterelic

Jul 28, 2010
15
0
#1
I use a Glx gt-80-b amplifier, and I am very pleased with it but this friday, The sound from bass suddenly disappeared. The only thing that came out of the speaker was a really unsettling noise, it was (is) a loud fuzzy sound. I changed the cable but the sound was still there. I unplugged the bass and the noise became stronger. Then I plugged it in again and tried out the pickup control knobs on the bass. It didn't make any different to the sound. The input increases the noise if there isn't a bass plugged in. Turning up the equalizer knobs increases the sound, with or without a bass. Chorus makes the sound brighter. Master volume
changes the noise from fuzzy to the sound that appears when someone tries to wreck your bass in document shredder. :help: please (could it be some metal thing stuck in input or something like that, If there's an easy solution to this please post it here and let me know if you have/had this prob.)
 
#3
There is a very slight possibility that there is something metallic stuck in it but there is a huge possibility that you need to take it and get it repaired.

It could be one, or more, of several possibilities but I doubt that anyone on TB could diagnose the fault without actually hearing it for themselves and then doing some diagnostic testing. Even if they can pinpoint the fault I suspect it is beyond the average TB member to fix unless they are a trained electronics engineer, music store service tech, radio ham, or keen amateur electronics enthusiast, etc.

Sorry to be so negative but I don't think it is quite as simple as a piece of metal jammed in the jack socket, but it could be. Sounds more to me like component failure, which one(s) would probably take test gear and considerable knowledge and experience to locate.
 
#4
whiterelic said:
I use a Glx gt-80-b amplifier, and I am very pleased with it but this friday, The sound from bass suddenly disappeared. The only thing that came out of the speaker was a really unsettling noise, it was (is) a loud fuzzy sound. I changed the cable but the sound was still there. I unplugged the bass and the noise became stronger. Then I plugged it in again and tried out the pickup control knobs on the bass. It didn't make any different to the sound. The input increases the noise if there isn't a bass plugged in. Turning up the equalizer knobs increases the sound, with or without a bass. Chorus makes the sound brighter. Master volume
changes the noise from fuzzy to the sound that appears when someone tries to wreck your bass in document shredder. :help: please (could it be some metal thing stuck in input or something like that, If there's an easy solution to this please post it here and let me know if you have/had this prob.)
Click to expand...
Whatever the problem is it needs to go to a tech because something sounds as if it has failed in the preamp.
perhaps a coupling cap has failed or part of the printed circuit
has come disconnected.
As you say you have no signal through the preamp at all mixed in with the very loud distorted mains hum which is what I guess you are hearing BRRRRRRRRRRRRRRRRRRRRRRRGH ETC.
Do you have an fx loop on the amp? perhaps if you plug your bass into the fx return it will tell you if the Power amp and speaker are still functioning cleanly.:hmm::hmm:
 
#5
RickenBoogie said:
First, what is a glx gt-80-b amp. A combo? What speakers? What wattage? What type of eq are you using? And second, could it be that maybe you blew the speaker out?
Click to expand...

Yup.

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SPECIFICATIONS

Input sensitive / impedance: -20dBu / 1MΩ (@1KHz)
Output (RMS): 80W / 4Ohm
Speaker: 1x12”
Effect: chorus
Connections: input (1/4”), aux in (RCA), headphones (1/4”), line out (1/4”)
EQ: 4-band EQ: low, low mid, high mid, high ±12dB
Power Supply: 240V~50Hz
Net weight: 18kg
Dimensions: 480x360x515mm

Compact 80 watt 1x12 combo
Built in chorus and compression
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A review:
http://www.musiker-board.de/reviews-bass/359526-amp-glx-gt-80-b.html

The manual in English (you'll have to scroll down the page a bit)
http://www.basvandenbroek.com/nl/content/18/downloadbare_documenten.html
 

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