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Audio output beam tetrode with octal base

KT66 CV321 Osram Oversize glass same code KB/L black base smoked glass Holy Grail equivalent EL37 6L6G

CV321 Osram, rare KT66 oversize glass £ 1,000 quartet

KT66 GEC brown base smoked glass full cup getter EL37 CV1075 6L6G matched quartet

KT66 GEC smoked glass original boxes £ 800 quartet

KT66 GEC double getter close cose XA XE Z made at Hammersmith CV1075 6L6G EL37

KT66 GEC clear glass double getter £ 450 quartet

KT66 GEC early Old logo brown base smoked glass full cup getter CV1075 EL37 6L6G mathced quartet

KT66 GEC early logo boxed £ 850 quartet

KT66 Marconi black base smoked glass Holy Grail close codes CV1075 equivalent EL37 6L6G

KT66 Marconi black base smoked glass £ 800 quartet

KT66 Marconi early red logo rare valves black base smoked glass original Marconi boxes EL37 6L6G equivalent

KT66 Marconi smoked glass black base original boxes £ 850 quartet

KT66 Marconi full cup getter Clear glass UK made best KT66 clear glass CV1075 EL37 6L6G valves tubes

KT66 Marconi full cup getter £ 575 quartet

KT66 Marconi oversize glass black plate smoked glass red label holy grail EL37 CV1075 6L6G quartet

KT66 Marconi Oversize glass tall glass £ 1,000 quartet

KT66 Marconi red label full cup getter brown base CV1075 Holy Grail EL37 6L6G

KT66 Marconi Red label smoked glass £ 750 quartet