The famous Neve Class A recording series modules such as the 1066, 1073, and 1272 all used a similar gain building block like the BA283.
This circuit consists of two stages of amplification on a single printed circuit board with an input voltage gain stage and a line driver output stage.
The BA283 are connected with EQ, filters and fader inserted between them in the case of the channel amplifier modules such as the Neve 1073 or directly connected with just a level control or an external fader between the two stages in the case of the Neve 1272.