page_title: Earth Sound Research
section_title: Design infringement
hierarchical_section_title: Earth Sound Research / Design infringement
caption_attribution_description: Picture of the front of a Earth Sound Research Earth Revival guitar amplifier
context_page_description: Earth Sound Research Corporation is a defunct American manufacturer of electric amplifiers, effects units and related equipment.
context_section_description: Most of their models were either outright or close copies of then current, successful amplifiers and other audio equipment. 
  Early Earth Sound Research amplifiers used all tube circuitry and were assembled inside the Benjamin Electric Sound plant in Farmingdale.  The company also hired subcontractors for component assembly.
  Qualtrol Electronics, Inc., a third party subcontractor located in Deer Park, New York, supplied Earth Sound Research with amplifier chassis and sub-assemblies. Andy Fuchs, a former employee of Qualtrol said “I worked for Qualtrol, the subcontractor who made the Peavey Electronics clones... Qualtrol did a nice job (in my opinion) of copying the Peavey gear (for Earth Sound Research)... They (Qualtrol) cloned the circuits, which (ironically) were RCA textbook Transistor Manual circuits.”
caption: ESR Revival Series Model M1954 4x10 tube combo. Similar to a Fender Bassman '59 or Peavey Vintage.[3]
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