Mullard NT22B Silica Triode
Tube à silice
Silica-Röhre

NT22B = CV1209 = 7420B.
Filament: 27 V • 48 A directly heated.
Dissipation: rated for 15 kW.

The cylindrical anode was formed by winding molybdenum tape on a wooden mandrel, and weaving longitudinal strips of the same tape into the winding to produce a basket structure.
Three molybdenum ribs were also woven in to make the structure more rigid, and also to leave tails to locate in the envelope and make a connection to a lead-out seal. This type of construction allowed new or modified designs to be made up very quickly. It was also better thermally than a solid cylinder, in that a significant proportion of the filament radiation passed through the basket's interstices and did not contribute to the temperature rise of the anode.

 

Longueur • Length • Länge : 70 cm • 27" 1/2
Diamètre • Diameter • Durchmesser : 157 mm • 6" 1/8

Unfortunately, the tube was improperly secured in its transport crate and arrived completely broken. Only the anode was salvageable.

Woven molybdenum anode

Longueur • Length • Länge : 262 mm • 10" 1/4
Diamètre • Diameter • Durchmesser : 121 mm • 4" 3/4

Détail • Detail

 

---

Le contenu de ce site est sous copyleft The content of this site is under copyleft Der Inhalt dieser Website steht unter Copyleft