(electronics) pentode (vacuum tube)

use, usage

(electronics) diode (rectifier tube)

radio / (slang, dated) broke, having no money; dining and dashing (punning off of 無線 (musen, “wireless”) with the sense of 無銭 (musen, “money-less”)) / radiation (when used as part of a compound)

use, utilize

the past / ancient times

(not of a person) old, aged, antiquated

old

pipe / a wind instrument

pole (eg. North Pole); extremity, zenith / quindecillion