5692 RCA "red bases" have a seductive and sweet midrange. They do not, however, allow for higher plate voltages (which means that if a GTB is reccomended because of higher plate voltages, the tube life of the red base will be shortened). NOS Sylvanias and RCA's are plentiful at reasonable cost. The KenRad's in my opinion have the best bass control. The Tung-Sol round plates are the all round winner, hands down, but, unless you happen upon them serendipitously, expect to pay through your nose for them. By all means, try as many as you can, tube rolling is fun! Happy Listening.
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