(!!!) (Best Single) 7247=12DW7 Mullard England NOS 1963 (1.9ma/11.8ma) (High Ma and Gm)
(!!) (Good Value) 7247=12DW7 GE tall gray ribbed plates NOS 1965 (0.75ma and 10ma)
(!!) (Recommended GE Single) 7247=12DW7 HH Scott by GE tall gray ribbed plates NOS 1961 (1.0ma and 9.2ma)
(!) 7247 GE branded RCA NOS 1970 (0.7ma/10ma)
