Mullard Magic: For All Your Vintage Valve and Radio Needs!
CV2821, MIL SPEC ECC33, MULLARD, BROWN BASE, 5K B5F, BLACKBURN 1955 PRODUCTION
ECC33, MULLARD, BLACK BASE, FAINT PRINT, WHITE BOX,
ECC33, MULLARD, BLACK BASE, NEW, WHITE BOX, FACTORY CODE, B24J2
ECC33, MULLARD, BLACK BASE, WHITE BOX, FACTORY CODE, 1324I2