5696 slotNational Instruments PXIe-5696 Amplitude Extender. The National Instruments PXIe-5696 (part number: 783128-01) is an Amplitude Extender desned for use with the PXIe-5654 RF AnalogThe anode is the thin vertical strip on the rht opposite the slot in g2. In operation g2 is normally connected to the cathode. Another view of the small vertical anode strip. The thin glass tube