GZ34MullardBranded PhilipsRound TipBaseBlackBottle HeightHalfCode On TubeF32 B6K2CountryGreat BritainFactory CodeB - Mullard, BlackburnGlass ColorClear GlassMicaDoublePermanentidinc3y7haPin ColorSilver PinsPlate ColorMatte GrayTip ShapeRound TipYear1966More GZ34 type tubesGZ34, 5AR4Branded ZaerixGZ34, 5AR4Branded SonotoneGZ34, 5AR4, F32MullardBranded SylvaniaGZ34PhilipsBranded MullardGZ34, F32Branded ValvoGZ34, 5AR4, F33Branded AmperexGZ34MullardBranded IttGZ34Branded PhilipsMiniwattGZ34Branded PhilipsMiniwattGZ34More tubes manufactured by MullardEL34, XF2MullardBranded SylvaniaCV491Mullard6CA7, EL34, XF2MullardBranded AmperexEL34, XF2MullardBranded PhilipsEL37MullardBranded AmperexECC33, FX1MullardBranded ValvoEL34, XF2MullardBranded PhilipsECC82, I61MullardBranded ValvoEL34, 6CA7, XF2MullardBranded Siemens12AU7, K61MullardBranded TungsramMore tubes branded PhilipsEL84Branded PhilipsEL34, XF2MullardBranded Philips6SN7GTABranded PhilipsGZ32Branded Philips7693, E90F, 8F6Branded PhilipsEL34, XF2MullardBranded PhilipsECC83, MC1ValvoBranded PhilipsMiniwattECC40Branded PhilipsMiniwattEL34RFTBranded Philips6SN7GT, R93MazdaBranded PhilipsMiniwatt