Orban Optimod 2200. 

These are still nice sounding units and work just fine in many markets.  They don’t breathe fire, but it’s tough to make one sound bad. 

When they do it’s often a simple op amp.  failure.  This one needed just that. 


These Burr Brown chips have been out of production for a while now.  TI does make a replacement. 

I have a few left but the supply is dwindling.  

Valley Audio


Valley Audio 401 Mike processors.  These things still sound great. 

 I  them in quite often to refurbish. 


When they look like this, you can figure on Mountain Dew.  It’s always Mountain Dew. 


Most equipment has a weak spot or two and this is the 401’s.  The voltage regulator heat sinks are held on with nylon hardware.  Nylon hardware becomes brittle when subjected to heat over time.   The heat sink comes loose and the regulators overheat.  If we are lucky the failure stops there.  If not, the op-amps  are usually next. 


The later units are SMD.  A hot air rework gun makes these fairly simple.  And a magnifying glass to see that you’ve got the pins aligned.