英文關鍵字
amplifier
anode
audio
broken
bulb
cathode
closeup
component
device
diode
discharge
el84
electrical
electricity
electron
electronic
engine
equipment
gear
glass
industry
lamp
light
lightning
machinery
macro
malfunction
manufacturing
metallic
obsolete
old
pentode
power
radio
repairing
retro
science
sparks
steel
technology
television
tube
vacuum
valve
vintage