The 715B is a tetrode pulse modulator intended to be driven by a rectangular pulse. The peak current demands require four independent cathodes and the warm-up time should be three minutes if full current is to be drawn. The peak pulse power is 225 kW and the anode has a 60 Watt dissipation.
This 715B has the JAN prefix that denotes a specification agreed for the Joint American Army and Navy.
The 715B is a direct equivalent to the STC P535-1E and was intended for use in aircraft radar systems.
The metal anode is stitched together on eather side.
The JAN prefix and Maker's name together with reference codes.
The internal insulators are ceramic for strength and to withstand the EHT applied to the anode. We also have with this exhibit the ceramic base that it fits into. The ceramic disc on the valve base aligns with the top of the base ring. A bar passes through the outer base, and the notch in the valve base and is then secured by a hook and nut above the outer ring. Thus locking the valve firmly in place.
The underside of the base. The pins are held by double springs and the locking hook can be seen at the bottom of the image.
The ceramic valve base is 88 mm in diameter and 8.5 mm thick. The square locking nut and hook are at the bottom of the image.
The wide glass tube envelope is 66 mm in diameter, and excluding the B4A base pins is 140 mm tall.