Hi how are you?
I'm having this problem with my amp. I connect it to the power, i connect the cab's cable, the bass cable to the input and turn it on. The purple light is on, the fault yellow light is off and i think that the signal form the bass is ok because the clip/peak light is blinking when i play. The thing is that i tested more than one cab and there is no sound coming out of the speakers. I tested the cabs with another amplifier and worked, so the problem is with the portaflex. I can hear my bass with the headhones out so i think the preamp is working, something is happening to the amplifier circuit or the speaker output. I opened the case and cleaned all the inputs with a contact cleaner, the fx send return, headphones out, bass input, speakers outputs, everything. I cant see any blown caps or something like that. One thing that works is to power on the amp and leave it alone for some minutes(not sure how many), and it starts to sound, its like it was warming up or something. The amp works for some days, i stop using it for some days and it stops sounding again. I do the same thing, i leave it alone to warm up for some minutes. I tested the preamp board alone and it s working fine, so i think the problem is somewhere in the power amp section. What do you think?
I'm having this problem with my amp. I connect it to the power, i connect the cab's cable, the bass cable to the input and turn it on. The purple light is on, the fault yellow light is off and i think that the signal form the bass is ok because the clip/peak light is blinking when i play. The thing is that i tested more than one cab and there is no sound coming out of the speakers. I tested the cabs with another amplifier and worked, so the problem is with the portaflex. I can hear my bass with the headhones out so i think the preamp is working, something is happening to the amplifier circuit or the speaker output. I opened the case and cleaned all the inputs with a contact cleaner, the fx send return, headphones out, bass input, speakers outputs, everything. I cant see any blown caps or something like that. One thing that works is to power on the amp and leave it alone for some minutes(not sure how many), and it starts to sound, its like it was warming up or something. The amp works for some days, i stop using it for some days and it stops sounding again. I do the same thing, i leave it alone to warm up for some minutes. I tested the preamp board alone and it s working fine, so i think the problem is somewhere in the power amp section. What do you think?
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Could be a bad connection in the power amp somewhere (e.g. bad solder joint, etc.) which is re-establishing contact, due to thermal expansion, after a 'warm-up' period.
Not sure about this one, but some modern amps have ribbon cable connectors, or other push-fit connections, which can develop an intermittent contact. If so, disconnect - spray with contact cleaner - then re-connect.
Look very carefully at all solder joints - it is not unknown for factory-made joints to be 'touching' but not actually soldered.
Not sure about this one, but some modern amps have ribbon cable connectors, or other push-fit connections, which can develop an intermittent contact. If so, disconnect - spray with contact cleaner - then re-connect.
Look very carefully at all solder joints - it is not unknown for factory-made joints to be 'touching' but not actually soldered.
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