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Or, in the good old days – oops – but that was before computer monitors… (From: Don Wall (d.wall@nunet.neu.edu).) Sure, it’s usually the largest tube in the set, has a top cap, runs very hot, and is often a 6BQ6G or some such. (tongue firmly in cheek) Actually, back in the days of yore, the Horizontal Output Tube was frequently referred to as the HOT; guess some things don’t change!
