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Original Message
For those looking for 12AU7 sub-types.
Posted by FenderLover on May 28, 2017 at 16:29:15:
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.