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Search Shipping rates: We offer free shipping across all orders! The 6SK7 as an I-F Amplifier - Due to the increased gain of the 6SK7 compared to the 6K7, either the overall gain can be increased or the IF bandwidth performance improved.

AC-DC Stereo Amplifiers Using Output Tubes Having 100 mA Heaters - Three different low-cost amplifiers using the new 100 mA tubes.

Enhancing the Visibility of the NUMITRON Dispaly in Sunlight - Techniques to get the best contrast when using NUMITRONs in sunlight.

High-Power Crystal Oscillator a Reality with RCA-813 Tetrode• A Precision Three-Mode Voltage Calibrator November, 1969• A Mobile 50-Watt Transmitter for the Six- and Two-Meter Bands, Part I Winter 1962 - 1963• Equal Plate and Screen Voltage Operation of the 6L6 - Operation of the 6L6 with identical plate and screen voltages.

Operation of the 6SB7-Y - Application of the 6SB7Y high-gain pentagrid converter.

New Molded-Plastic Frames for Coincident-Current Magnetic Memory Stacks Utilizing 20- and 30-Mil Cores - RCA was making computers at this time, and this was part of the infrastructure.

Circuit UC-23 Shows Single-Ended 811 R-F Amplifier for CW Telegraphy• Receiver Design - Various tidbits to improve receiver performance, covering: Power Output of the 6R7, Voltage Rating of Tubes, Series-Filament Operation of 2-Volt Tubes, Rectifier-Tube Sputter, and Increased Current Rating of the 6H6.

New Super has Stability and Sensitivity Plus• But can take longer from time to time.

There was a whole industry of companies making replacement PC boards to drop into the Dynaco Stereo-70 to eliminate the 7199.