Sensibly equivalent¶ to:
1299A 3D6 CV815 DL29
The 1299 / 3D6 is an American battery amplifier pentode. The all glass designs did not emerge until 1938, the first reference in the Brimar manual is 1950 as the UK did not make Loctal valves until after 1945. We believe that the 3D6 was used in Canadian WS58 wireless sets for portable military communications.
The wide glass tube envelope is 28 mm in diameter and, excluding the B8B (Loctal) base pins, is 54 mm tall.
References: Datasheet & 1040. Type 1299 was first introduced in 1942.
Absolute Maximum Operating Conditions¶
Updated September 07, 2013. shape:wide.glass.tube construction:all.glass type:pentode age:1940.1950 base:b8b heater:1.4v pins:8 pin:1.f pin:2.a pin:3.g2 pin:4.- pin:5.- pin:6.g1 pin:7.fct pin:8.f-