Hi Everyone!
This is my first posting as a new member.
I bought a Forte 1A a few months ago. The left channel always causes the speaker to make a "pop" noise when the amp powers up. Also, after preamp and amp are powered up there is a low frequency hum coming from the left speaker. Not sure if I can hear the buzz from the right speaker.
The left speaker also makes a "whoosh" sound when powering off the amp.
Has anyone else experienced this? Should I be concerned about maintenance?
I am a bit new to this hobby and do not know much about this amp.
My setup:
Speakers: Ologe 5, LS 50 wired, Magnepan LRS
Amp: Forte Audio 1A
Preamp: Bryston BP 26
Thanks!
This is my first posting as a new member.
I bought a Forte 1A a few months ago. The left channel always causes the speaker to make a "pop" noise when the amp powers up. Also, after preamp and amp are powered up there is a low frequency hum coming from the left speaker. Not sure if I can hear the buzz from the right speaker.
The left speaker also makes a "whoosh" sound when powering off the amp.
Has anyone else experienced this? Should I be concerned about maintenance?
I am a bit new to this hobby and do not know much about this amp.
My setup:
Speakers: Ologe 5, LS 50 wired, Magnepan LRS
Amp: Forte Audio 1A
Preamp: Bryston BP 26
Thanks!
Please prepare a BDT(dim bulb tester) circuit for the amp under testing.
First you disconnect your amp form preamp input and speakers, just power on the amp and measure the amp DC output at the speakers posts, and then test the left channel power supply capacitors voltages, you can compare the voltages with right channel side.
If they are normal and you just connect speakers(no preamp) to the amp and see if the "pop" ans "whoosh" sounds still there.
Maybe you replace the big cap on the PCB can help.
First you disconnect your amp form preamp input and speakers, just power on the amp and measure the amp DC output at the speakers posts, and then test the left channel power supply capacitors voltages, you can compare the voltages with right channel side.
If they are normal and you just connect speakers(no preamp) to the amp and see if the "pop" ans "whoosh" sounds still there.
Maybe you replace the big cap on the PCB can help.
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@patrick101 Thanks for getting back so fast!
I'll see about getting or making a BDT and also comparing the left/right voltages.
What DC output level should I be looking for at the speaker posts?
I'll see about getting or making a BDT and also comparing the left/right voltages.
What DC output level should I be looking for at the speaker posts?
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Normal a 5mv~50mv range, you can compare with the right channel.
If a highe DC output, maybe the input twin fets problem.
If a highe DC output, maybe the input twin fets problem.