Here are the specifications of the Morrow MB560 transmitter.

• Frequency Coverage: 3.5-4MHz, 7.0-7.3MHz, 14.0-14.35MHz, 21.0-21.45MHz, 28.0-29.7MHz. Bands are selected via a front panel bandswitch.

• 11 tubes.

• Frequency Control: VFO or Crystal

• Power Output: 3.9MHz 50 watts, 29MHz 40 plus watts.

• Power Input:

  6 vdc @ 6a or 12 vdc @ 3a

  67.5 vdc @ 1ma

  250 vdc @ 90ma

  300 to 600 vdc @ 200ma

• Output Network and Impedance

  52 to 70 ohm pi network

• Dimensions: 11.75" wide, 4.125" high, 9.375" deep.

• Weight: 10.75 lbs

• Manufacture date: 1955-1957

• Tubes:

  12AT7 Osc

  6AN8 Buffer

  5763 Doubler

  6146 Final

  12AX7 1st AF

  6AL5 Clipper

  12AT7 Driver

  6AV5 Modulator

  6AV5 Modulator

  0B2 Regulator

  0B2 Regulator

Latest update: 12/28/25