There you are at the surplus store, staring into the bin of faded orange, yellow, red, and black, boxes–a treasure trove of vintage vacuum tubes—dreaming about building a tube amp for your guitar or a ...
Prototron Circuits Southwest Inc. started out humble, at least in Tucson. Parent company Prototron Circuits of Redmond, Wash., was doing work for big-name companies in the Seattle area including ...
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