Mullard type QV08-100 all glass HF TX tetrode

1940-1960

Sectioned water-cooled anode, for a demountable tetrode valve

1939

Titanium anode, spot-welded platinum wire attached

Watmel variable anode resistancce Panel mounting type

Titanium anode subjected to applied anode potential whilst exposed to sea water

Magnesium sacrificial anode with cable