(!!!!!) (Good Value Pair) 12BH7A RCA gray ribbed plates NOS and like new 1960's (7.3/8.6ma and 7.2/7.7ma)
(!!!!) (Best Single) 12BH7A RCA gray plates NOS 1970 (10.6/10.2ma)
ECC99 JJ (best identical substitute is 12BH7A RCA, Raytheon, Sylvania and GE)
