Burndept thermionic valve A18; HL512 from Wireless World September 1925:
The H.L.512 is a very economical valve for general-purpose work. The emission at normal voltage (5.0) is very liberal, and actually, in practice the valve may be operated with a much lower filament voltage, which will, of course, tend to increase its life. The electrode construction of this type takes the modern "flattened" form with small inter-electrode clearances. Anode rating 40 - 100 volts.
- Radio Communication
- Object Number:
- thermionic valve
- component - object
- Gift of Dr. G. R. Airth
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