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Showing content with the highest reputation on 05/09/2024 in all areas

  1. markdd
    Greetings from Raleigh-Durham area. I repair vintage HiFi as a hobby. Few years ago I repaired a MXR-130 and loved the innovative technology used in the PS and FM stereo noise reduction design. Recently bought a Carver MXR-2000 that has loud hum in power transformer with -69vdc and +69vdc rails measuring at -/+99 volts on both. TRIAC was replaced with no change. All Zener diodes voltages ZD801 through ZD805 are normal. Appears that voltage monitoring circuit may be driving TRIAC to 100% duty cycle. I see design uses optocoupler to provide signal to control drive to the Q801 through Q804 to determine switch on/off time to the TRIAC to maintain the +/-69VDC. Is it safe to remove the TRIAC so I can power up rig to T/S the regulator circuitry? Thanks in advance for any suggestions. Mark
    2 points
  2. randog311
    The Animals Don't Let Me Be Misunderstood (LIVE The Ed Sullivan Show)
    2 points
  3. Rob
    Carver MXR-150 restoration by Nelionaudio. M4.0t MKII upgrade by Nelionaudio. TFM 55X Restore by Nelionaudio. Black Magic 25 Won in a drawing. RAM 285 Last one available.
    1 point
  4. Bobby1970
    Led Zeppelin Over the Hills and Far Away (Live at Madison Square Garden, NY, 7/1973)
    1 point
  5. Bobby1970
    Led Zeppelin Going To California (Live at Earls Court 1975)
    1 point
  6. randog311
    Foreigner Urgent
    1 point
  7. Bobby1970
    Gerhard Trede Jolly Days
    1 point
  8. randog311
    Joan Jett & The Blackhearts I Love Rock 'N Roll
    1 point
  9. Bobby1970
    Billy Munn Jazzy Interlude
    1 point
  10. randog311
    R.E.M. Everybody Hurts
    1 point
  11. randog311
    38 Special Teacher, Teacher
    1 point
  12. Bobby1970
    Bob Crosby Way Back Home
    0 points
  13. Bobby1970
    Roy Brown Butcher Pete (Part 1 & 2)
    0 points
  14. Bobby1970
    Tex Beneke A Wonderful Guy
    0 points
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