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agedhorse

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About agedhorse

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    N. CA

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  • Occupation
    Music Industry Product Development Engineer

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  1. I would be surprised if the cause was the diode. The FET in the impedance translator circuit is a much more likely cause, and I have seen them fail. There is also the possibility of contamination on the PCB in the very high impedance area of the circuit, small leakage can create a lot of noise that will typically increase with humidity and temperature.
  2. Yes, feedback can occur in a filter if there is a problem within the filter's electrical feedback loops. There is a fine line between a filet and an oscillator, the higher the Q of the filter, the closer to an oscillator it can become. Sometimes an intermittent in the sweep pot can cause this, way more likely than a defective cap.
  3. They are all worth about zero unfortunately. Same for most analog consoles of the era including some $10k+ consoles that I have taking up shop space.
  4. Peak power is defined as twice the RMS rated power. It's different math describing exactly the same thing, like 12 eggs or 1 dozen eggs. Depending on the AC power source, there may be enough sag in the power supply that it clips a little earlier resulting in ~1400 watts peak.
  5. In bridge mode, the sleeve MUST be isolated/floated through the patch bay and ALL associated wiring. What you have encountered is a common situation with installations not designed/installed by pros who understand the details underlying WHY things are done. The bummer for you is that your amps are going to need fairly costly repairs.
  6. 59 points at your age Bill? I hear they have medication for that . I have a gig in a couple one of months with 60 discrete points but it's all in a Tele-Strut grid using a boom lift so it's child's play (and no lights)!
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