Dorrough Electronics was a pioneer in multiband broadcast processing. This is a model 610, the digitally controlled sucessor to the original 310.  These are mostly in collector’s hands now, although a few undoubtedly remain in service. Dating […]

Aphex sold a lot of these 200/230/Channel  Mike Processors. Unfortunately the built in power supply doesn’t age well.    They have a somewhat unique sound thanks to what they call “reflected plate”tube technology.  The tube is run at a very […]

      Here we go again, Symetrix 528E mike Processors.  Some noisy, some non-functional. Let’s pick one and see what we can find.                                  […]

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 truly bad.  When they do it’s often op amp.  failure.  This one had […]

    Valley Audio 401 Mike processors.  Long out of production but they still get the job done.     Mountain Dew.  It’s always Mountain Dew.    Most equipment has a weak spot and this is the 401’s.  The voltage regulator […]

 Symetrix 528E Mike Processors.   These are good sounding units but switch failure is  common.  Depending on which switch, the unit can stop functioning entirely.  Often cleaning them with a good contact cleaner is enough to restore things, other times you […]