ULTRA RARE 1955 TUBES MULLARD CV491 12AU7

FIRST YEAR PRODUCTION from 1955 made in Blackburn ENGLAND

ORIGINAL SEALED IN A PLASTIC BAG from the factory

REAL NOS TUBES - OPEN ONLY for pictures and tests

SELECTED FOR MILITARY USED with no traditional box !!!!!!!!

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This is the rarest and best sounding 12AU7 with wavy glass, D shaped square getter, BVA logo, 17 mm long plates .........

Same codes on glass : k61 B5L  ( Blackburn 1955 )

STRONG and EXCELLENT GM Values :  98% - 100%  and 95% - 100%    

  Tested on AMPLITREX 

Near matched pair

Really rare to find NOS MULLARD CV491 sealed and never used before

UPS shipping : $99

Sold as is ---- no return ---- sale final