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MH4 Catkin metal Marconi Osram external anode audio output valve

Marconi Osram MOV catkin MH4 £ 150 pair.

MH4 Marconi clear glass balloon shape mesh plate cup getter Holy Grail equiv. 354V AC/HL

MH4 Marconi balloon mesh plate £ 400 pair.

MH4 Marconi balloon mesh plate £ 750 quartet.

MH4 Marconi metalised balloon mesh plate cup getter early 1930s 354V AC/HL equivalent

MH4 Marconi grey metalised £ 400 pair.

MH4 Marconi grey metalised £ 750 quartet.

MH4 Marconi Osram ST shape metalised mesh plate – MH4 Marconi Osram balloon vertical anode rare mesh plate 354V AC/HL

MH4 ST shape Marconi £ 100 pair.

MH4 Marconi balloon mesh plate £ 250 pair.

MHL4 Marconi Osram balloon mesh plate audio triodes equivalent 154V 164V 41MLF

Marconi MHL4 balloon mesh plate £ 400 pair.

Osram MHL4 balloon mesh plate £ 400 pair.

ML4 Marconi balloon mesh plate rare equivalent AC/P CV1179 NR57

ML4 Marconi Osram balloon £ 380 pair.

ML4 Marconi Osram balloon £ 700 quartet.

MT5B Marconi – NR14 Marconi Navy Admiralty Receiving valve – NT10 Marconi Navy Transmitting valves

Marconi MT5B triode dated 1919 GBP 220.

Marconi NR14: Admiralty valves GBP 180 pair.

Marconi NT10 Navy Transmitting GBP 150.

MU14 Marconi Osram 43IU early type mesh plate cup getter audio rectifiers

Marconi Osram MU14 Indirectly heated rectifiers tested 100% £ 400 pair

Marconi Osram MU14 no logo tested 80% £ 150 pair

MU14 Marconi Osram ST fat shape mesh plate MU12 cup getter

MU14 Marconi Osram tested 80% £ 180 pair