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