Featured in the February 1949 Radio Electronics magazine, this benchtop instrument generates multi-range audio signals. The circuit has 6 tubes including the rectifier.
This circuit was obtained in a 1991 Electronics Handbook. The publication no longer exists, but...
We found this circuit in Ferranti's 1974 transistor manual. The components are from the period. Note...
This instrumentation amplifier was obtained from Popular Electronics in 1993. The operational...