TM11-856 (Collins R-390/URR) manual, reprint.

This is a digitally copied and enhanced Dept. of Army technical manual TM11-856; Air Force TO 31R1-2URR-154 (Collins R-390/URR). It is clear, clean, and easy to read.  It is printed on premium 24# paper with heavy covers and bound with a plastic comb.  No more struggling with unreadable photocopies!

The TM11-856 manual measures 8 1/2" X 11" with about 137 pages plus 36 large one piece fold outs or sheets. Topics include: introduction, description, operation, organizational maintenance, theory, filed maintenance, alignment and adjustment procedures, shipment and limited storage and demolition, voltage diagrams, parts location diagrams, and index.

The one piece foldouts include:

  • 23" First and second IF amplifiers

  • 17" Third an forth IF amplifiers

  • 19" AGC circuit

  • 19" Voltage regulator circuit

  • 17" Assembly instructions for multiconductor cables

  • 30" RF gear train

As per the original 30 additional sheets are provided in an envelope:

  • 17" Block diagram
  • 17" Antenna circuit and first RF amplifier
  • 17" Second RF amplifier
  • 17" First mixer stage
  • 17" Fifth and sixth IF amplifiers
  • 19" AF amplifier
  • 17" Line audio channel
  • 19" Power supply, PP-621/URR
  • 17" Filament and oven circuits
  • 17" Break-in circuit
  • 23" Mechanical tuning system block diagram
  • 17" Tuning system exploded view
  • 17" Assembly instructions for cable No. 1
  • 17" Tube voltage and resistances for top deck
  • 17" Tube voltage and resistances for bottom deck
  • 17" Terminal board voltage and resistance diagrams
  • 23" AGC voltage distribution
  • 30" B+ voltage distribution
  • 19" RF subchassis wiring diagram
  • 23" Crystal oscillator subchassis wiring diagram
  • 17" VFO subchassis wiring diagram
  • 17" IF subchassis wiring diagram
  • 17" AF subchassis wiring diagram
  • 17" Calibration oscillator subchassis wiring diagram
  • 17" Power supply PP-621/URR wiring diagram
  • 30" Main frame wiring diagram
  • 23" Subchassis and interconnection diagram, part 1
  • 23" Subchassis and interconnection diagram, part 2
  • 34" Schematic diagram, part 1
  • 38" Schematic diagram, part 2