Valve Gallery -
Screened Tetrodes And Pentodes (3)
Valves: DF1, EF9,
|Shown above is a Mullard DF1 valve. This
rather less common valve was designed for a battery receiver, probably
portable. It features a heater of only 1.4 volts, with P Type CT8
base. Height of 93mm.
||Shown above is a rather dirty Mullard EF9 with P
Type (CT8 base). This is a var valve with 6.3v heater.
|Shown above is a Marconi Osram KTW63. This is
the var u version of the KTZ63 next picture. Otherwise similar
characteristics, though slightly shorter envelope at 117mm..
||Following from previous caption, above is the
KTZ63 then. Heater voltage is 6.3v, International Octal (I.O.) base,
but a little taller at 122mm.
Continue to the next Screened
Tetrodes and Pentodes gallery page
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