A family of Philips Innoval tubes – left to right, 6BH5, 6M5, 12AN7, 6N8, and 6AN7. Photo: Daniel Stocks.
In this issue
- Innoval – “The Most Advanced Tube in the World”
- From Reasearch Lab to the Field – GE’s Vacuum-Tube Contributions During World War I, 1915-1918
- RD-Instruments Model 1700 – Hickoks Ultimate American Tube Analyzer
- Fetrons and Hybrid Integrated Networks – “Silacon Valley Meets Merrimack Valley”
- Radiotron UV 211 Instructions
- Weird Circuit of the Month: CBS Simplified Phons Amp
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