GZ34MullardBranded RCARound TipBaseBlackBottle HeightHalfBrand ExtendedRadio Corporation of AmericaCountryGreat BritainFactory CodeB - Mullard, Blackburn, B - Mullard, BlackburnGlass ColorClear GlassMicaDoublePermanentiddnhqat2q8Pin ColorSilver PinsPlate ColorBlackTip ShapeRound TipYear1960sMore GZ34 type tubesGZ34, 5AR4Branded ZaerixGZ34, 5AR4Branded SonotoneGZ34, 5AR4, F32MullardBranded SylvaniaGZ34MullardBranded PhilipsGZ34PhilipsBranded MullardGZ34, 5AR4, F33Branded AmperexGZ34MullardBranded IttGZ34Branded PhilipsMiniwattGZ34, F32Branded ValvoGZ34More tubes manufactured by MullardEL34, XF2MullardBranded SylvaniaCV491MullardEL37MullardBranded AmperexEL34, XF2MullardBranded Philips6CA7, EL34, XF2MullardBranded AmperexECC33, FX1MullardBranded ValvoECC82, I61MullardBranded ValvoEL34, XF2MullardBranded PhilipsEL34, 6CA7, XF2MullardBranded Siemens12AU7, K61MullardBranded TungsramMore tubes branded RCA6386Branded RCA12AX7Branded RCA8417SylvaniaBranded RCA5692Branded RCA7591ASylvaniaBranded RCA7058RCABranded RCA5881Branded RCA12AX7, ECC83Branded RCA6BH6Branded RCA12AX7Branded RCA