Above is a " reverse engineered " rough layout of a circuit board by which we had to "trace out" and  derive a working 
  electronic circuit layout to effectively service and repair a 30 output  video amplifier / distribution box for our client 
  to use and work from.
 
  Someone had attempted (though very poorly) some 10 + years ago, to build a video duplication box with 30 outputs with 
  using a now obsolete hex transistor array, which normally under digital or logic switching would function as per the 
  data sheet, however it was very much a different output when deployed as a video amplifier, with odd stray parasitics 
  due to the use of the same chip "die" within the LM3086N. Bad choice of video amplification components by the previous 
  designer of the 30 way video distribution amplifier.
 
  Despite these problems, the owner "struggled-on" for years with a poor resolution output for his Tape Duplication business. 
  As there was no circuit available, we contacted the owner and explained that in order to repair the unit, we would need to 
  devise some form of workable schematic diagram, this was before we discovered the stray parasitics and other inherent  
  "noises" within each LM3086N chip. The LM3086N is basically a six NPN transistor array in a 14 pin DIL package.

  This all takes time to carefully check for 100% accuracy and correct component orientation as well as the correct data
  sheets and identification of each part. The circuit above took 2 hours to trace out and a further 2.5 hours to  carefully 
  draw the relevant 100% accurate working electronic circuit.
   
  Note: The circuit  (above) was "reasonable", however the "LM3086N chip transistor array" exhibited thermally induced 
  parasitics and a basic lack of performance, inherent picture instability, features not conducive to a  client's projected long 
  term usage in a business where quality matters, in fact it is an absolute requirement.

  This more than likely resulted from aging stock and manufactured in circa 1994 and no longer  made by NS,  So, after an 
  in depth consultation with our client, it was resolved that the unstable circuit boards were to be removed from the Video
  box and returned to our client, we set to and designed a   fresh "new circuit" approach was to adopted thus providing our
  client with 50 good solid video outputs from one video input source. Our client was highly delighted with our efforts and
  paid us accordingly.

  The scrapped circuitry was fully removed and using the fresh new idea and approach, a viable circuit design was skillfully 
  produced, prototyped and tested by us at Unitech and field tested at the clients premises with all benefits measured in
  terms of reproduced picture quality on a series of video tapes and the final test of a copy from a copy, this is the 
  "acid test " on how well a copy is being made, the results were delightful, however, more importantly,  our client was
  very happy with our efforts and especially with the results.  As a bonus from prototype testing, we were able to include
  such benefits as 10 stage video signal attenuation to cater for various video input strengths. Not all video tape signals
  are weak and not all are strong either.

  Research and development on a project such as this takes time and money, more time and more money usually, however, 
  the end result is what counts, a very satisfied client, delighted with the extra efforts and attention to detail we took to make 
  sure each video output was fully stabilised  and that all 50 video outputs functioned correctly,  thus providing an excellent 
  amplified video signal Video to all 50 outputs simultaneously to each and every VCR (VTR), with no distortion or color 
  fade or drop out, even with the annoying Macrovision.

  Please note:   For repair work , it is advisable to acquire a correct circuit diagram prior to delivery of your goods 
  or equipment to be serviced and repaired. If one is not supplied, then we will need to do " reverse engineering " 
  of the circuit and tracing it out fully, thus establishing a correct operational circuit schematic diagram to work  
  with for fault finding. This will cut down wasted time in trying to establish how the circuit works and what faults 
  stop it.   There is no guess-work here.   We do not own a "crystal ball"  and no-one here is called Nostradamus.