(!!!!) (Recommended Single) 12BH7A RCA rebranded Westinghouse black plates "U" getter NOS 1955 (8.4/12.8ma)
(!!) 12BH7A RCA gray plates used/good 1960's (8.0/11.2ma)
(!!) 12BH7A RCA gray plates used/good 1970 era (8/9ma)