Replaceable apertures for the Wehnelt cylinder can be supplied to fit some microscopes.
A hole size smaller than normal gives improved characteristics for most electron guns.
Used in Philips/FEI, Leitz and Amray. Aperture diameter 10mm.
Tantalum Apertures for Wehnelt 19.99mm x 0.25mm
Price range: € 225,20 through € 304,20
Replaceable apertures for the Wehnelt cylinder can be supplied to fit some microscopes.