Valve Gallery -
Screened Tetrodes And Pentodes (4)
78E, EF50, EF80, DF91.
|Shown above is a Philco 78E. This is a var
u valve with American UX6 base. Height of 117mm.
||Shown above is a Mullard EF50. Used extensively
during WW II. B9G base in metal case. 6.3v heater. Height of
|Shown above is a Mullard EF80. Incredibly
common pentode, still vast quantities surviving, perhaps because it was so
reliable. See all the individual internal
component parts here 6.3v heater 65mm height.
||Shown above is a Mullard DF91. This valve
is var u, and has a B7G base. All glass valve from mid to late
1950s. Height of 55mm.
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