This step of two transistors has a high input impedance due to the use of FET. We can use BF245 for this function and the bipolar can be BC548. The circuit is from an 1975 American documentation.
This circuit was found in Radio Electronics from May 1965. The SCRs and transistors are from that...
Found in a 70s RCA manual, this circuit uses transistors from the era. Equivalent types can be...
This circuit is placed between the instrument pickup and the amplifier input. The same version can...