6X4 / 6202 / EZ90 types

This GE 6X4 rectifier tube has gray plates and a halo getter. The white print on the label has the GE logo and 188-5 factory code (Owensboro, Ky), and "6X4 U.S.A." is etched in the glass. Tube tests as new.

This early 1960s military spec 6X4 Raytheon tube has black "X" style plates and a windmill getter. The red print on the label reads JRP-6X4W (label condition varies). Tube tests as new.

This 1960s RCA 6X4 rectifier tube has black plates and a D-getter with two dimples. The white or red print on the glass has the RCA logo (label conditions vary from excellent to partial or missing). Tube tests as new.

This late 1960s military spec Sylvania 6X4WA rectifier tube has shiny black plates and a halo getter. The green print on the label reads JAN 6X4WA or JHS 6X4WA. Tube tests as new.

This early 1960s Tung-Sol 6X4 rectifier tube has black plates and a D getter. The white print on the glass has the Tung-Sol logo. Tube tests as new.

This 1961 military spec Tung-Sol JTL-6X4WA rectifier tube has black "X" style plates and a curved D getter. The white print has the Tung-Sol logo and reads "JTL-6X4WA" or "JTL-6X4W." Tube tests as new.