Screen-grid Valve Holder.
PPONGS rubber valve holder fias been introduced for use, where the S625 type passes through a4 screen. The rubber holder is attached to the screen, and holds the centre of the valve in a non-microphonic grip.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19280427.2.41
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Radio Record, Volume I, Issue 41, 27 April 1928, Page 12
Word count
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39Screen-grid Valve Holder. Radio Record, Volume I, Issue 41, 27 April 1928, Page 12
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