This handbook was primarily written to cover Receiver P38 (Patt. W7963). Receiver P48 (Patt. 54491) is identical with P38 except for the following:-
Condenser 2 - 8 micromicrofarads (C1) in P38 is replaced in Receiver P48 by a 5 - 55 micromicrofarad condenser controlled by a knowb (K1) on the front panel (see fig below) and the 5 micromicrofarad ceramic condenser (C124) connected in parallel with C1 is omitted in Receiver P48.
The image above is repeated inside the following file so that you can use the zoom tool to have a look more closely at the controls.