Contribute
to QRZ
to QRZ
QRZ Trivia Quiz for 2025-02-25
What was the first three element vacuum tube called?
A: valve
B: radio tube
C: audion
D: detector
Choose an answer from above...
You are not logged in!
You're welcome to stick around and try a few trivia questions but your progress will not be tracked and you will not be entered into the sweepstakes.
You're welcome to stick around and try a few trivia questions but your progress will not be tracked and you will not be entered into the sweepstakes.