The 6829 is a sharp cut-off, medium μ double triode designed for computer applications and other control electronics where the valve may be in cut-off for prolonged periods.
The GE logo and Made in USA.
The anodes can dissipate 2 Watts each.
The thin glass tube envelope is 21 mm in diameter and, excluding the B9A base pins, is 59 mm tall.
References: Data-sheet, 1040 & 1043. Type 6829 was first introduced in 1960. See also1960 adverts.