The CV354 disc seal triode was based on the VX3019 and commercially is the DET23. This exhibit is new and came in the original packaging. However, the valve is identified as a DET23 not CV354.
The Mullard TD03-10 has a 10 Watt dissipation that matches the CV354 specification.
The literature from the post war era gives the DET23 from M-OV and Mullard TD03-5 as equivalents but these two valves have a maximum of 5 Watt anode dissipation.
This physically small disc seal valve has co-axial connections. The heater and cathode are opposite the main envelope. The grid has a circular connection to the flat internal metal mesh. The anode appears to be copper and has a flat surface facing the grid.
A grounded grid configuration would allow for a two cavity mechanical design.
The expanded polystyrene is shaped to securely one of these valves with space at the other end - use unknown.
The spacing between the electrodes has to be vary small and thus the grid wires must all fall within the same plane. To achieve this the grid is wound on a plate with the wire under considerable tension (half the breaking strain of the wire is quoted). One side of the wires is then shaved off leaving a single sided frame grid.
The frame grid is then attached to the rest of the grid supports and outside ring.
The planar envelope is 15 mm in diameter and, tip to tip is 60 mm tall.
References: Data-sheet. Type CV354 was first introduced in 1954. See also1954 adverts.
