(!!!) (#1 7247 Mullard Pair) 7247 Mullard UK NOS 1966 same build 1-2% matched (BEST SOUND)
(!!) (#1 7247 GE Single) 7247 GE rebranded RCA 1960's
(!!) 7247 GE NOS 1960's rebranded National and GE same build (1 Pair)
(!!) 7247=12DW7 GE branded GE Kuhl-Tube cryo-treated 1960's same date codes (1 pair)
(!) (#1 7247 Mullard 1960's) 7247 Mullard NOS rebranded GE 1966 (High Ma and Gm)
(!) (#1 7247 Mullard) 7247 Mullard NOS rebranded RCA 1972
12DW7 Sylvania NOS 1960's
7247 GE NOS 1960's
7247 GE NOS 1970's
7247 GE rebranded Raytheon 1960's
7247 ITT by Hitachi JAPAN NOS 1964
7247/12DW7 Mullard used/good 1965 copper grid posts no printing
