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The CV1098, also known pre-CV as the VT98, power triode is WWII vintage. The filament is a bright wire helix connected to the two base pins by stout rod supports. The grid is brought out to the side contact and stands on wire supports and encloses the filament. The anode is a copper bell with external brass collar. CV1098 is another example but without the packaging.

The CV1098 has an anode dissipation of 750 Watts and can operate at up to 100 MHz. The cooling collar is 85 mm in diameter and has holes drilled through it to form air tubes.

The GL2 transmitter used a pair of squegging VT98's as oscillator driving another pair of VT98's in push-pull as PA. This arrangement generated 10 kW pulses 1,500 times a second to a highly directional antenna, and it was this gun-laying radar that was probably used in the battle of El Alamein.

The plywood collar is around the guard ring connected to the anode. This anode appears to be plated brass whereas our other exhibit is plain brass. Both have a pattern of hole drilled through the anode to allow air to pass through over a greater surface area.

The wide glass tube envelope is 60 mm in diameter and, excluding the base pins, is 308 mm tall.

References: Data-sheet & R J Sutherland.

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.