The DV-5 was introduced in 1925. This valve was used mainly as an audio amplifier and had higher ratings than the DV-2. The DV-5 was particularly useful as a driver for an power output valve.

Lee De Forest was the man who introduced the grid first into the valve. This triode was made by his company.

The base has four stub pins and was made of ceramic. Isolantite was the trade name and the manufacturer still exists in America.

We have no operating data other than the label that states that it has a 5 Volt filament and it was designated for use as an amplifier.

The wide glass tube envelope is 32 mm in diameter and, excluding the base pins the valve is 99 mm long.

This exhibit was last updated on 02 December 2007