BIG Tube Value???

[Nigel Holmes 03 9626 1914 fax 03 9626 1917]

        857B were also used in the major HT supply of Radio Australia's
        first 100 kW hf tx's, made in Australia by Standard Telephone &
        Cables in about 1943. Mercury vapour with a PIV of about 20 kV at
        several amps from memory. Lots of filament power. Lots of UV at
        full load current. I'll check the specs tonight. Anyone want a
        dozen NOS?!!!

        Each STC tx used 6 x 857B to provide 10 kV to the rf pa at about
        15 amps. Another 6 x 857B provided 12 kV to the modulator. All
        the 857B were forced air cooled.

        (The STC tx's were decommissioned in about 1984 and replaced by
        the Gates/Harris 100 kW PWM tx's currently in service)

        73
        Nigel VK3ZNQ

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