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Search results with tag "Courtesy 1927 arrl handbook"
Courtesy 1927 ARRL Handbook - Tube Collectors
tubecollectors.orgCourtesy 1927 ARRL Handbook. BUILDING on the mercury pool and the inductance for keeping the tube operating stably will be most of interest to Handbook readers. The "keep-alive" circuit is necessary for A STATION 79 somewhat above the mercury pools to pro- tect the glass. Use light gas engine oil of