ðə ɹᵻmˈeɪnɪŋ nˈʌmbɚz aɪdˈɛntᵻfˌaɪd ɐ pɚtˈɪkjʊlɚ tˈuːb tˈaɪp; tˈuːbz wɪð ˈɔːl kˈæɹɪktɚz ɛksˈɛpt ðə fˈɜːst aɪdˈɛntɪkəl hæd aɪdˈɛntɪkəl ᵻlˈɛktɹoʊdz bˌʌt ɐ dˈɪfɹənt hˈiːɾɚ; ˈiː.dʒˈiː. ðɪ ˌiːbˌiːsˈiː ˈeɪɾi wˈʌn ænd jˌuːbˌiːsˈiː ˈeɪɾi wˈʌn.
The remaining numbers identified a particular tube type; tubes with all characters except the first identical had identical electrodes but a different heater; e.g. the EBC81 and UBC81.