Crossword Genius

What Marshall, Fender and Vox produce (4)

Ross

I believe the answer is:

amps

(Other definitions for amps that I've seen before include "Units of electrical power" , "Current measures" , "concert gear" , "'Units of electric current, in short (4)'" , "Basic units of electric current" .)

I've seen this clue in The Times and The Sunday Times.
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