This Sylvania valve was made to a US Government procurement contract and the Type designation VT-107B appears on the base cap. However, the valve is also marked as a 6V6G on the bulb.The 6V6, 6V6G and 6V6GT family was, and remains, a very successful audio beam tetrode design.![](../pics/aaa1679a.jpg)
Maker's code.![](../pics/aaa1679b.jpg)
The dome shows to interference fit top mica and electrodes. The cathode is rectangular, the control grid has copper supports, and the beam plates are clearly distinguished from a third grid.The classic envelope is 44 mm in diameter and, excluding the IO base pins, is 103 mm tall.References: Data-sheet, 1040 & 1043. Type VT-107B was first introduced in 1936. See also 1936 adverts. |