Tech Square

• Re: Sound Technology 1700B - N4ALG 04:58:19 03/25/09 (0)
  In Reply to: Re: Sound Technology 1700B modifications posted by john curl on January 26, 2005 at 14:59:53

  Would anyone happen to have the manual (service, operation, etc) for the Sound Technology 1700B? I would like to purchase or copy such so I can start repairs on mu analyzer. I will pay all costs associated with a purchase or copy. THANKS - Bill
  
  

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• Re: Sound Technology 1700B modifications - neubauer 11:19:58 02/06/05 (2)
  In Reply to: Re: Sound Technology 1700B modifications posted by john curl on January 26, 2005 at 14:59:53:

  1.Just to confirm. Did you change U1 in the oscillator to AD744 and did you also change the output U8 to most likely an AD797. Also what input ops did you change to AD797 (U101&U102 and maybe U103 ??)

  2. What changes did you make in regard to the offset and frequency compensation pins?

  3. Have you seen any issues with the original opto-coupler U7 in the oscillator? (notch tracking, bad low distortion output)

  4. And lastly, do you see any benefits in changing the 741 chips (U2-U5)to alternatives
  
  

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  • Re: Sound Technology 1700B modifications - d_b 21:39:32 03/16/05 (1)
    In Reply to: Re: Sound Technology 1700B modifications posted by neubauer on February 6, 2005 at 11:19:58:

    You seem to have the pulse on a lot of mods for the 1700B. I have recently acquired both a 1700B and 1701A and haven't found anything yet. Do you have a PDF copy of any articles you might have that you can share with a newbie?

    Is there another forum that gets into the mods?

    Also, is there anyone that would be willing to share a PDF of the schematics for these units? That would help me get started. ... and I would greatly appreciate it.

    Thanks!

    db
    
    

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    • Re: Sound Technology 1700B modifications - N4ALG 20:17:16 09/05/06 (0)
      In Reply to: Re: Sound Technology 1700B modifications posted by d_b on March 16, 2005 at 21:39:32:

      Hey folks, did anyone post the mods for the 1700B or 1701A? I am on the cusp of doing the calibration and seeking a service manual and the mods. Thanks - Bill
      
      

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• Re: Sound Technology 1700B modifications - Trevor Wilson 15:20:55 01/26/05 (0)
  In Reply to: Re: Sound Technology 1700B modifications posted by john curl on January 26, 2005 at 14:59:53:

  Thanks a bundle John. I'll give it a try. The thing won't measure distortion, so I need to get inside. Once there, I figure on making some improvements.

  
  Trevor
  
  

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