Here are the Randall Amplifier (Mk II) schematics in Adobe Acrobat format:
Randall Amp page 1 (PDF: 66Kbytes)

Randall Amp page 2 (PDF: 118Kbytes)

The differences between the original Randall Amp and the Mark II version are:

• Filter chokes changed from 1.5H/75 ohm to 4.0H/65 ohm. These larger chokes have to be mounted diagonally under the chassis for them to fit. The residual hum level is reduced and users report a more "dynamic" sound.
• Cathode compensation capacitors (C105, C205) changed from .0039 uF to .012 uF. This gives flatter frequency response at 20KHz.
• Shielded wire from RCA jacks to volume control and from speaker terminals to feedback circuit changed to twisted 26 AWG wire-wrap wire.
• The rectifiers were changed from the trouble-prone Chinese 5AR4 to the reliable Philips ECG 5V4GA (military surplus).
• The paralleling of the rectifier sections was changed so that each side of the transformer secondary goes to the two sections inside a rectifier, instead of being spread across two rectifiers. This helps reduce arc-over when the rectifiers have different characteristics.

You can also see the write-up and pictures of the Randall Amp here.

The Randall Amp "Hall of Fame" - a collection of outstanding variations of the Randall Amp is here.