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There are 8 clues with the answer 'PENTODE'
# CLUE
1.
Vacuum tube with five conductors
2.
Electronic valve
3.
Type of old vacuum tube
4.
Vacuum tube with five active components
5.
Valve could be opened round the end of the vent (7)
6.
Electronic valve (7)
7.
What is a thermionic valve with five electrodes called? (7)
8.
Tube amplifier with five active components