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RE: Acoustat New Desigh Interface

76.242.77.36

Sondek

In Reply to: RE: Acoustat New Desigh Interface posted by blgtrio on January 14, 2025 at 12:46:51

That's one sweet lookin servo.

Yers are purdier than mine are. Carl does nice work.

Follow Ups:

RE: Acoustat New Desigh Interface - blgtrio 11:49:54 01/17/25 (7)
Mike, tell me again which op amp you are using in your servos?
- RE: Acoustat New Desigh Interface - Sondek 16:50:06 01/17/25 (6)
  Oldies,but goodies.
  
  The venerable Burr-Brown OPA627.
  - You should really try - E-Stat 17:13:35 01/21/25 (5)
    discretes from Sparkos or Burson Labs.
    - RE: You should really try - Sondek 16:44:36 01/22/25 (4)
      I've discussed using those very opamps with my amp builder.
      
      Seems it's not possible without a substantial rebuild of the amps to utilize them. The input socket would need to be rebuilt to accept newer discretes.
      
      Not impossible, but lot of work and expense.
      - Question - E-Stat 16:52:01 01/22/25 (3)
        
        In Reply to: RE: You should really try posted by Sondek on January 22, 2025 at 16:44:36
        
        which package type for the OPA627 is used?
        
        If the TO-99 case was used, that makes sense. Most discretes are direct replacements for a wide range of chip based op amps using the common 8 pin dip package.
        
        RE: Question - Sondek 16:58:30 01/22/25 (2)
        
        In Reply to: RE: Question posted by E-Stat on January 22, 2025 at 16:52:01
        
        That's what I got.
        
        Yep, TO-99 case - E-Stat 17:06:39 01/22/25 (1)
        
        In Reply to: RE: Question posted by Sondek on January 22, 2025 at 16:58:30
        
        not found much today. The LM-301s found in my PAT-5 from the mid 70s used the same package.
        
        When I replaced OPA-2134s/2604s in a Music Hall DAC, it was a quick swap using socketed DIP8.
        
        RE: Yep, TO-99 case - Sondek 17:09:43 01/22/25 (0)
        
        In Reply to: RE: Yep, TO-99 case posted by E-Stat on January 22, 2025 at 17:06:39
        
        Same experience for me when I ditched the stock opamps in my Fosi gear and replaced with Sparkos.
        
        Five minute job even getting the casework open and shut.

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