Low noise amplifier (T466E)

Found in 1948 MIT documentation, this 4-tube amplifier is characterized by its low noise level.

Instrumentation Amplifier (CB4938E)
This circuit is from an old 80's linear circuit manual. The configuration can be implemented with modern...
Peak detector (CB9689E)
This detector with ultra-low deviation was found in an American documentation from the 90s....
Voltage converter for pulse duration (CB6095E)
This circuit was found in a Signetics documentation from the 1980s. Next to the figure are the...