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  1. M

    Phil Jones M300 Bass head - sound cutting out

    As an amp tech UK based, I’ve been passed a M300 that has reported to have completely lost sound on gigs, on three occasions. Both channels silent when it occurs. Recycling the power brings back sound. Suspect it is being triggered into protect? Any ideas? Is this a known fault? Amp is...
  2. M

    Ampeg PF350 - powers up, no fault light, but no Sound

    I have repaired this new version to the point where it powers up fine, fault light out, but now audio output. This is due to IRS20957s not starting up oscillation. Voltages appear good, except for CSD which sits at 3.2v. It needs to be above 5v to operate. Mute circuit checks out fine. any...
  3. M

    Trace Elliot GP12 - 160Khz Oscillation

    I own a GP12 300W combo that I use at a weekly jam session. Stopped working yesterday. I’m an amp tech also. Looked that the amp this morning and I’m little stuck. As you raise the o/p volume the output (connected to a dummy load) shows a 160 KHz oscillation. With or without input signal. This...
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