buffer stage

IC2 is used as the buffer stage in the active lowpass filter ahead of the delay line.

IC1 acts as the input buffer stage, and it is a simple operational amplifier non-inverting mode circuit.

There is a new transformerless 75 ohms output buffer stage brought out to both standard coaxial phono and precision BNC connectors.

Preemphasis time constant is 50 s. The signal after passing buffer stages is applied to a modulator where it modulates an intermediate frequency carrier (IF).

A current buffer stage may be added at the output to lower the gain between the input and output terminals of the amplifier (though not necessarily the overall gain).

Carrier oscillation is performed by a 6AH6 tube with an additional 6AH6 buffer stage followed by a 6AG7 output amplifier.

Note that the increased voltage signal gotten from increasing Z comes at a cost, since in order to drive other circuits down the chain with the higher voltage, a powered buffering stage is required (such is the basic operating principle of active DI boxes and any high impedance receiving circuit in general).