Miniatur high mu triodes, more and more used for audio, specialy in phono mc preamps.
6HM5 EC900 are also used in later Fisher 500C in tuner unit together with nuvistors 6CW4 in Golden Syncrode front end as V1 insted of EC97 / 6GK5 in 500B and early 500s Golden Cascode front ends.
This is SQ version with taller glass envelope than EC900 and big getters.
Great results in Yaqin Little Dot Amps!!!
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