Questions about tubes and gear that glows. FAQ
These are the ones I've had most success with. Lightly gray glass, black plate, square getter ring Hytron made 7318 tubes. Often labeled CBS-Hytron or National. Think they are late 1950s, early 1960s era tubes.
Rich tone. Good in phase inverter position.
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Topic - For those looking for 12AU7 sub-types. - FenderLover 16:29:15 05/28/17 (2)