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The Harries tetrode output valves form one of the main features of this exhibit. They are available in 2 Volt battery types and in 4- and 13 Volt indirectly heated models. The AC/YY, which consumes 2 Amp at 4 Volts, is rated for 300- and 250 Volts anode and screen potentials; the output from a pair in push-pull is rated at 11 Watts.
Hivac AC/YY output valve.
Short-wave valves with 'top-grids' and ceramic bases are also on view, and the range of midget valves is extended by a triode encased in a metal sheath. In addition, there is a range of 13 Volt valves for car and AC/DC sets.
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