ɪn jˌʊɹɹəpˈiən nəmˈɛŋklətʃɚɹ ɐ fˈɜːst lˈɛɾɚ "ˈiː" aɪdˈɛntᵻfˌaɪz tˈuːbz wɪð hˈiːɾɚz təbi kənˈɛktᵻd ɪn pˈæɹəlˌɛl tʊ ɐ tɹænsfˈoːɹmɚ wˈaɪndɪŋ ʌv sˈɪks.θɹˈiː vˈiː; "ˈeɪ" aɪdˈɛntᵻfˌaɪz sˈɪmɪlɚ fˈoːɹ vˈiː; "jˈuː" aɪdˈɛntᵻfˌaɪz tˈuːbz wɪð hˈiːɾɚz təbi kənˈɛktᵻd ɪn sˈɪɹiz əkɹˌɑːs ðə mˈeɪnz səplˈaɪ, dɹˈɔːɪŋ wˈʌnhˈʌndɹɪd ˈɛm ˈeɪ; "ˈeɪtʃ" aɪdˈɛntᵻfˌaɪz sˈɪmɪlɚ wˈʌnhˈʌndɹɪd fˈɪfti ˈɛm ˈeɪ, "sˈiː" aɪdˈɛntᵻfˌaɪz sˈɪmɪlɚ tˈuːhˈʌndɹɪd ˈɛm ˈeɪ, ænd "pˈiː" aɪdˈɛntᵻfˌaɪz sˈɪmɪlɚ θɹˈiːhˈʌndɹɪd ˈɛm ɐ sˈɪɹizkənˈɛktᵻd tˈuːbz.
In European nomenclature a first letter "E" identifies tubes with heaters to be connected in parallel to a transformer winding of 6.3 V; "A" identifies similar 4 V; "U" identifies tubes with heaters to be connected in series across the mains supply, drawing 100 mA; "H" identifies similar 150 mA, "C" identifies similar 200 mA, and "P" identifies similar 300 mA series-connected tubes.