Electron tubes, namely, solid-state electronic component assemblies used for direct replacement of glass electron vacuum tube devices used in audio and musical amplification applications, namely, guitar amplifiers, audio amplifiers, signal conditioning circuits, and other glass-vacuum-tube emulation applications

'amplif':25 'amplifi':29,31 'applic':26,42 'assembl':9 'audio':22,30 'circuit':34 'compon':8 'condit':33 'devic':19 'direct':12 'electron':1,7,16 'emul':41 'glass':15,38 'glass-vacuum-tub':37 'guitar':28 'music':24 'name':3,27 'replac':13 'signal':32 'solid':5 'solid-st':4 'state':6 'tube':2,18,40 'use':10,20 'vacuum':17,39

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