Comparator with AND gate (CB9407E)

This tunnel diode circuit was found in American documentation from 1966. The tunnel diode is the critical component of this circuit.

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10 + 10 W amplifier TDA2009 (CB15246E)
The supply of this circuit can be done with voltages from 8 to 28 V and the maximum output current is...
1960 Hybrid Audio Stage (CB14753E)
This audio configuration of televisions from the 1960s was found in a Mullard transistor reference...
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We found this circuit in a 1975 radio amateur documentation. The circuit uses TTL technology and...