A boxed NOS Mullard military spec CV378 KB/DA GZ37 valve with spot welded gray plates, triple mica and halo getter. The letters WF are below the war dept arrow. The Blackburn date code is IS1 B5E3. A FWD 19v REV 406v. B FWD 19v REV 407v.
The valve has been tested on the Amplitrex AT1000. Read the condition section as this forms part of the description. Unpacked weight is 0.075 kg. Packages weighing over 2kg will be sent via International Signed For Courier.