In this issue

• The Lenkurt Tube Mystery Odd choice of tubes used by Kenkurt.
• #45 Tube Substitutes Various ways to adapt tubes to perform with the characteristics of another.
• A “Holier Than Thou” 7B7 Possible explanation for the 7B7 being made with an odd choice of meterials.
• The “General” Is Coming! Steps taked to make the best impression to the President of RCA.
• Sodion Tubes – Don’t Try This At Home! Problems cleaning dirty Sodion tubes.
• Development of the Power Pentode in the U.S. Late introduction of power pentode tubes made in the U.S.
• Stromberg-Carlson 8-80 Amplifier Advertisement for the 8-80 stereo amplifier.
• The Altec TV Set! The famous audio amplifier maker tries entering the TV market.
• From DeForest’s Notebook DeForest’s notebook seems to show his development style to be experimental more than electronic analysis.