10W Amplifier with 6 tuber (T492E)

We found this 6-tube amplifier in a 1947 publication. It is a Public Address amplifier with excellent performance using triodes on the output.

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Sinusoidal buffer (CB9555E)
This amplifier for a sinusoidal function generator uses a 741 integrated circuit. The circuit is...
Reed Switch triac control (CB12238E)
In the figure we have the way to control a TIC series triac with a reed switch. The current in the...
5 A TTL power source LM340 (CB14256E)
This source was found in the National Semiconductor's Linear Applications Handbook of 1994....