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Old 22nd May 2006 | Show parent
  #4
Lives for gear
 
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The LM-301 chips were basically a "second generation" opamp, and not really great for audio. Yes, the chips can be upgraded, but one problem is the package that ADM used...the round "TO-5" metal package vs. the much more common 8 pin DIP. Not too many opamps are still available in the TO-5 package.

Later ADM modules used the LF-35x family which were in the TO-5 package, and last I checked they were still available from Digikey. The LM-318 is another possibillity, as is cobbling a DIP-8 wirewrap socket into the round PC board positions.

Bri