Sherbourn 2-100A Amplifier

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  • MrCommunistGen
    Polk Audio RTi100 Plate Amplifier won't power on and intermittently honks and buzzes
    by MrCommunistGen
    My childhood best friend was killed about 9 years ago. His parents are finally letting go of his things, and they offered me his Polk RTi100 tower speakers. The Polk RTi100 towers are one of a handful of designs from the early 2000s that is a full range 3-way tower with a built-in self-powered subwoofer. This is accomplished with a plate amp integrated into the speaker input panel.

    I think they used them for a while, but they've been sitting for at least a few years now. After about 40 hours of driving to their house and back (both they and I have moved in the last 9 years) I got...
    07-12-2021, 05:11 PM
  • jinu_j
    How to test Subwoofer Amplifier with only a multimeter
    by jinu_j
    Hi Folks

    Need some advice on how to test a subwoofer amplifier if i have access to only a multimeter.

    Problem
    I have a Boston Acoustics active Subwoofer (soundware S). Its rated output is 200W. But the output i am getting is very low i can barely hear/feel it even if put the gain at max. I replaced all the capacitors in the Subwoofer amplifier but still no change.

    Is there anyway to test this without getting an oscilloscope/Function generator to see if the fault is with amplifier, driver or the source??

    Any advice would be appreciated...
    08-29-2024, 02:05 AM
  • UserXP
    Mackie CR4 amplifier no sound
    by UserXP
    Hi, people.

    I've got an amplifier assembly from Mackie CR4 parts. It's just an amplifier, there was no speaker housing, so I used my set of CR4s to test it.

    Anyway, upon connecting everything and hooking the "new" amplifier to an audio source, the sound played clearly and strongly for the first ten seconds. I was happy it was working. Then the sound started to fade out during the playback until it was no more. After it had "dropped to zero", there were two very short intervals of sound playing at the normal volume, as if the amplifier was trying to...
    10-17-2020, 05:06 PM
  • Francesc V.
    Rotel RSX-1056 amplifier. Troubleshoot a noisy channel
    by Francesc V.
    Hi:

    I've realized that one of the channels of this amplifier has no proper sound.


    This is the signal at the speakers output.

    As long as the audio coming in to the amplifier board (blue) looks ok although with some noise due to the wire, I think that there's nothing to look at the preamp section.




    Now, I could start looking at components to see whether I find the guilty one.......but I would rather prefer to ask for advice. Here there is the amp. schema. Which points would you check with the oscilloscope to gather...
    07-15-2025, 01:33 AM
  • waspie
    Aiwa GX-770 Amplifier Protection Circuit
    by waspie
    I am by no means an expert on this type of troubleshooting but I can follow direction real well.

    I'm no stranger to using a meter and soldering iron so I'm looking for some help in fixing an old amplifier/system I got. This is part of a system "V-1200" by Aiwa where there are several components. My first problem seems to be the amplifier.

    It seems to be in protection. When first turned on I hear the inital relay coming on but never the second relay which is connected to the protection IC. I don't see any obvious bad components on the board. If I ground the...
    11-29-2022, 09:58 AM
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