Voltage amplifier with the 37 tube (T392E)

Found in a modern design book with tubes, this stage with the triode 37 has a plate current of 3.7 mA.

Synthesizer Amplifier (CB1491S)
This circuit is intended for signal amplification of electronic musical instruments. We found in a...
VCO with the 741 Operational (CB4829E)
We found this circuit in a documentation from the year 2000. This circuit appears on the site...
60V Bidirectional Current Sensor (CB5378E)
This 60 V High Side bidirectional sensor was found in a 2005 Linear Technology handbook. The...