Recent content by JD

  1. JD

    A Troubleshooting Tale

    The interesting thing is that you can unplug everything and still have it damaged by a nearby strike. I repaired a number of new VCRs that were still in the box when lightning struck outside a store once. The EMP from the strike outside the store blew the head preamps. As each one was sold, it...
  2. JD

    A Troubleshooting Tale

    That's called the "Cintuas" clause of repair, as in "Since Ya" did that repair, we have this new problem.
  3. JD

    ETC Sensor Rack Dimmer Bypass

    Another concern has to do with the fault current interrupt rating of the circuit breaker. When you bypass the SSR/Choke, the potential fault current is higher. The breakers in the CC20 are approved for this higher fault current.
  4. JD

    Design Issues and Solutions Upgrade from Altman (or similar) r40 border lights

    Of course there is one other option- Keep the existing boarders in place and operational and then add newer fixtures as the budget become available. You will probably find you need far fewer fixtures in the long run, especially if you are just doing video. The boarders only use power when they...
  5. JD

    Automated Fixtures Chauvet Finish turned Sticky!

    This definitely appears to be the "rubberized" coating. The same plastic that is not coated is fine. Same issue on the guard rails on the controllers. Kind of reminds me of the funky decay that happened to the foam lining in old anvil road cases. I just need to find the right compound to take...
  6. JD

    Automated Fixtures Chauvet Finish turned Sticky!

    Store equipment for a while and you find new issues! In this case, I am having an issue with the black mat finish on my Chauvet fixtures. This may not be brand specific, but it has me scratching my head. It appears whatever was used to give the black plastic parts a mat finish has degenerated...
  7. JD

    Shoebox Dimmers

    Check the older threads. The triac used in these is a 15 amp triac, there is a drop-in replacement 25 amp triac. Where as the 15 amp ones sometimes pop on inrush, the 25's give you enough headroom to make the unit very reliable. Best par is the triacs are less than $2
  8. JD

    30 foot lightweight truss system with L16 crank lifts

    This item has now been sold.
  9. JD

    Vintage Lighting Actual "Nernst Lamp" running (120 years old)

    Must admit I had never heard of this light source, but it was apparently an early competitor to the standard incandescent lamp around 1900. "Photonicinduction" apparently has a couple and refirbed one and then put it through it's paces! Pretty strange and operates without a vacuum, but requires...
  10. JD

    Lycian 1209 575 HMI Low usage (37 hours)

    Why thank you Ron! Hard letting go, but it's time unless I intend to get buried with the stuff! ;)
  11. JD

    30 foot lightweight truss system with L16 crank lifts

    Lightweight used system included two L16 crank lifts and 30 feet of lightweight Versatruss. $2,350 More informations and pictures can be found here: 30 foot truss with lifts including links for manufacturer specifications. Pickup near Philadelphia PA Zip- 19454
  12. JD

    Lycian 1209 575 HMI Low usage (37 hours)

    Finally fully retiring! This spot is in very good shape, 37 hours of use. $2,200 Full information and pictures are here: Lycian HP 1209 Followspot Philadelphia area (pickup only) zip- 19454
  13. JD

    DMX Input Not Working

    Big fan of Big Clive. I have seen the videos. Most people do not realize that all that lies between them and line voltage is a thin film of tape that often is applied wrong, or did not separate the primary and secondary lead wires. I have run into more than one case where the output of an ac...
  14. JD

    Passive speakers

    A second on the "maybe." If it is a two-way system (horn and speaker) you will need a crossover network to separate the highs and lows. Of course, some powered speakers only contain a single amplifier and already contain a passive crossover. Most better speakers will have separate amplifiers...
  15. JD

    DMX Input Not Working

    If the zeners were pulled because they failed, then the unit probably was hit with a very high over-voltage at the DMX port. That can happen if another fixture fails in a way as to introduce line voltage on it's circuit ground. Since most all units use switch-mode power supplies, high-pot...