(electronics) cold-cathode tube / (informal, electronics) cold-cathode fluorescent lamp

use, usage

cathode

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

cool / cold (beer, person) / chill