For those looking for 12AU7 sub-types.

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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)

RE: For those looking for 12AU7 sub-types. - Mechans 16:54:52 05/29/17 (1)

RE: For those looking for 12AU7 sub-types. - FenderLover 23:17:37 05/29/17 (0)

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