We found this circuit in the 1982 SGS linear integrated circuit manual. The L149 is not common today and the circuit can be implemented with equivalents.
Found in a 1969 Electronics World, this circuit is intended for amplifying analog cable TV...
Place the lamp on the ignition threshold via R2. Your approach causes it to light up. The secret is...
This circuit has a voltage gain of approximately 100 times and can operate with medium and high...