mullard blackburn 6bq5 el84 four pieces tube lot 1966 strong tested

mullard blackburn 6bq5 el84 four pieces tube lot 1966 strong tested

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RARE Matched Pair NOS/NIB Mullard Blackburn 12AT7/ECC81 tubes - Test NOS

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1x Mullard ECC33 6SN7 Brown Base Lower [] Getter Orig. Box - Blackburn '57 - NIB

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(2) NOS Test Mullard Blackburn Factory Code 6BQ5/EL84 Guitar Audio Tubes

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Mullard Blackburn 12AX7 etched codes MaxiPreamp2/TV-7 tested (1) tube lot

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ECC83 12AX7 Mullard (Valvo logo) I63 Blackburn 1966,matched pair 100%+ NOS NIB

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RCA ECL86/6GW8 TUBE (by BLACKBURN MULLARD) strong tested! *****

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EF86 Z729 Mullard Blackburn big mesh plate,square getter,early type,rare 1955 yr

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Mullard 12AX7 ECC83 Low Noise Preamp Tube Blackburn UK Tests NOS

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Mullard 6201 E81CC Gold Pin Matched Pair - Mitcham '68 BVA - Same Code - NIB NOS

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