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Audio output pentodes valves with octal base

EL37 Mullard military grade CV586 EL35 KT66 6L6G equivalent double getter brown base code R62

Mullard EL37 CV586 double getter £ 750 quartet

EL37 Mullard PENTONE CV586 brown base thick getter EL35 KT66 equivalent BVA British Valve Association

Mullard PENTONE brown base thick getter £ 750 quartet

EL37 Mullard PENTONE double getter KT66 6L6G EL35 CV586 equiv British made

Mullard EL37 double getter £ 650

EL37 Mullard PENTONE rare double thick getter 6L6G EL35 KT66 CV586

Mullard EL37 double thick getter £ 800 quartet

EL37 Mullard PENTONE single thick getter CV586 KT66 6L6G etched code on glass 1282 K holy grail

EL37 Mullard single thick getter £ 750 quartet

EL37 Mullard ST fat shape old logo KT66 6L6G equivalent full getter code on glass 1282

EL37 Mullard ST fat shape early type £ 1,000 quartet

EL37 Mullard yellow print R62 B Blackburn double getter 6L6G KT66 EL35 CV586 equivalent holy grail

EL37 Mullard code R62 yellow print £ 600 quartet

EL37 ST fat shape PENTONE Square getter 6L6G KT66 EL35 equivalent holy grail!

Mullard PENTONE ST fat shape £ 1,000 quartet

EL84 Brimar N709 UK made 6BQ5 two rods supporting a single round getter

Brimar EL84 6BQ5 £ 120 quartet