Mullard Magic: For All Your Vintage Valve and Radio Needs!
6L6, KEN-RAD, TESTED, CV1948, VT-115,
6L6WGB, SYLVANIA, GREEN PRINT, BROWN BASE, 5881, MARCH 1971 MANUFACTURE, 6L6
MARSHALL, TUBE AMP DOCTOR, MATCHED QUAD, 5881, SAME FACTORY CODES