Audio Research Schematics
D40 Power amplifier
Schematic with 1x ECC81, 1x ECC83, 1x 6FQ7 & 2x 6L6GC (Audio Research)
VT60 Stereo Power amplifier
Schematics and parts list with 3x 6922 & 4x 6550 (Audio Research)
VT100 Stereo Power amplifier
Schematic (of one channel) with 4x 6922 & 4x 6550C (Audio Research)
VT130 Stereo Power amplifier
Schematics (of one channel) with 2x 6922, 1x 12BH7, & 4x 6550 (Audio Research)
See this page for a detailed description of how to bias a VT100.
See the Audio Research Database for lots of information of almost all AR products.