The LV1 is a WWII low noise RF pentode that dates from 1941. Noise is reduced by running with a high anode current and this valve could operate with 20 mA. It was used at around 125 MHz at the front end of the German Freya ground radar. The base has eight short solid pins at the same pin diameter as the B8B base. The spigot is shorter than the Loctal base and the locating pip is not mid way between two pins.
The anode is two plates with a connecting strap. Inside can be seen the wire grids. The control grid has a heat sink fin at the top.
Here the top heat sink can be seen as a U shaped blackened sheet.
The label is marked as good.
The top is complete with the standard Bakelite screw-on knob. These valves plugged into the front of the equipment to enable valve replacement by the operators.
The base based on the Sylvania Loctal design. Inside can be seen the centre fin on the anode for extra heat dissipation.
The open pitch of the suppressor grid with the close wound inner grids hard to separate visually.
The valve-holder assembly with the Paxolin sheet at the end holding the spring connectors.
Side view: the top on the right would be at the front panel with the chassis deep in the equipment.
The unused base connectors have been pre-tinned.
Complete with the valve in place.
The view the operator would have.
The wide glass tube envelope is 30 mm in diameter, and excluding the special base pins is 69 mm tall.
Reference: Data-sheet Type LV1 was first introduced in 1941. See also1941 adverts.
