Spray Shielded Valves
QNH of the latest improvements to the screen-grid type valve is spray shielding, a process by which a heavy metal coating is sprayed directly on the glass." Two important advantages are secured by this sprayed on metal, First, the need for the round, perforated metal shielding’ cans or Square metal compartments in receivers is eliminated, as this metal acts as an even better shield than did either of these two older methods. Second, this metal sprayed directly on the glass aids the screen-grid effect within the tube, making the types where used yet more stable and freer of feed-back and permnitting a higher efficiency with more gain per stage. The metal coating is connected with the cathode pin of the valve, Already sets employing this new feature are in New Zealand, and it is to be heped that in a short time the valves will be available for home constructors,
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https://paperspast.natlib.govt.nz/periodicals/RADREC19311204.2.39
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Radio Record, Volume V, Issue 21, 4 December 1931, Page 17
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153Spray Shielded Valves Radio Record, Volume V, Issue 21, 4 December 1931, Page 17
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