Oh, how I wishI had known more about the desirability of 300Bs, way back in 1985, when the Western Electric plant in Lawrence,
Massachusetts was unloading their entire stock of NOS NIB 300Bs for $15 each at the local area hamfests. Along with a wide variety of other Western Electric tubes. Little did I know back then...
I asked one of my friends who worked there, if the 300Bs were useful for RF power, he told me, they were used in analog
telephone repeaters and audio amplifiers. So I (ignorantly) decided that they weren't too useful for my purposes back then...
/ed B