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Audio output beam tetrode with octal base

KT61 KT63 KT66 KT77 KT88 EF36 EF37 EF86 etc

EF37 CV358 KB/DA brown base metalized glass best pentodes code on base

EF37 CV358 brown base £ 100 quartet.

EF37A Mullard red print BVA British made codes on base 4 pcs tested 100%

EF37A Mullard ST shape £ 120 quartet.

EF37A Philips MINIWATT red print large glass with letters on black base rare! tested 100% NOS

Philips MINIWATT EF37A tested 1005 £ 140 quartet.

KT61 black glass Osram holy grail oval logo EL33 equivalent suit Leak TL10

KT61 black glass rare £ 400 quartet

KT61 GEC Marconi Osram brown base clean top EL33 equivalent suit Leak TL10

KT61 Marconi GEC £ 300 quartet

KT61 Marconi wide logo 6P25 EL33 equivalent audio valves suit Leak TL10 cup getter

KT61 Marconi £ 350 quartet

KT61 Osram GEC 6P25 EL33 equivalent oval decal KT61 black base full getter suit Leak TL10

KT61 Osram Black base £350 quartet

KT63 Marconi Osram metal base etc. 6F6G audio valves

KT63 Osram metal base £ 200 pair, KT63 black base £ 200 quartet

KT66 Marconi ST fat shape rare Holy Grail black base smoked glass full cup getter 6L6G EL37 CV1075

KT66 Marconi ST fat shape boxed £1,200 quartet