Electron tubes; tube amplifiers; electrical and electronic components, namely, components and accessories for tube amplifiers, for musical instruments and for audio equipment, namely, connectors, control knob switches, reverb effect modules, effect pedals, and power attenuators; capacitors; speaker emulators; audio amplifiers; voltage regulators, namely, power boosters; electrical adapters for the automatic adjustment of the working point settings of electron tubes

'accessori':12 'adapt':47 'adjust':51 'amplifi':4,15,40 'attenu':35 'audio':21,39 'automat':50 'booster':45 'capacitor':36 'compon':8,10 'connector':24 'control':25 'effect':29,31 'electr':5,46 'electron':1,7,58 'emul':38 'equip':22 'instrument':18 'knob':26 'modul':30 'music':17 'name':9,23,43 'pedal':32 'point':55 'power':34,44 'regul':42 'reverb':28 'set':56 'speaker':37 'switch':27 'tube':2,3,14,59 'voltag':41 'work':54

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