Inside a 9-Volt Battery - RF Cafe

Ray-O-Vac Ad from the August 25, 1945, Saturday Evening Post - RF Cafe

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WHAT'S inside a 9 volt (9 V) battery

Philco Model 15 Series, 11-Tube Superheterodyne Chassis Radio Service Data Sheet, August 1932 Radio-Craft

Hetro Air-Ace Series M, 9-Tube 4-Band Superhet, May 1936 Radio-Craft - RF Cafe

GE Model 250 Radio Service Data Sheet, August 1946 Radio-Craft - RF Cafe

White Noise / Its Nature, Generation, and Applications, November 1962 Electronics World - RF Cafe

Two New Approaches to Amplification, November 1957 Radio-Electronics - RF Cafe

IMS 2009 RF/Microwave Museum Photos (Historical Booth) - RF Cafe

JFET's - Put Last Month's Theory to Work, June 1969 Radio-Electronics - RF Cafe

The Electric Motor, December 27, 1943 Life - RF Cafe