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Thesaurus
attenuator
audio-frequency tube
ballast regulator
ballast tube
beam-switching tube
convertor
current regulator
damper
detector
discriminator
doubler
ear trumpet
electronic hearing aid
focus tube
generator
hard-of-hearing aid
hearing aid
iconoscope
inverter
limiter
local-oscillator tube
megaphone
mixer tube
modulator
multiplier
multipurpose tube
multivibrator
oscillator
output tube
phase inverter
picture tube
power tube
preamp
preamplifier
pulse generator
radio-frequency tube
receiving tube
rectifier tube
regulator
repeater
speaking trumpet
stethoscope
transducer
transistor hearing aid
trigger tube
vacuum-tube hearing aid
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