Vintage Synth Repair

We have a bunch of "new" 74C at my work. They are still in the original rails, but were bought many years ago. If you give me a list of what you need. I can see what we have. Also, the sockets can get dirty, so sometimes even reseating the chips helps  or replacing the sockets with new double-wiping ones.

GB

  ----- Original Message ----- 
  From: Philip 
  To: vintagesynthrepair@yahoogroups.com 
  Sent: Sunday, June 27, 2010 9:46 AM
  Subject: [vintagesynthrepair] Oberheim OB-X and Cmos 74 series + Autotune


    

  Hi, I'm repairing a hopelessly faulty OB-X...I'm dealing with all the CPU and digital control side first....all the voice board faults secondly.. 


  First question...it's packed with early cmos 74 series IE 74C174 etc...what are the best equivalents for these and other 74C types? 74HC? 40174 for example?


  Second question: How long is the Autotune function supposed to run for? At the moment it stays on for about 2 seconds after button press...not that it seems to do much as it's hopelessly out of tune with various boards missing a VCO here and there...


  Thanks, Philip.