Note
CQ, Jul 1967, p. 24. (new products announcement)
73, Aug 1967, p. 108. (new products announcement)
FM magazine, Mar 1969, p. 32.
In online searches the unit is often referred to as the "Comtron series," and generally described as being for 6 meters. The new products announcement (CQ, Jul 1967, p. 24.) referred only to 2 meters.
The 972A is not listed in "Tube Type Transmitters" (which also includes amplifiers) by Eugene Rippen (copyright 2011), but it is listed in the "Ham Equipment Buyers Guide" (volume 1), compiled by Alton Brand, (public domain) which notes that it is designed for high band operation (144–174 MHz).
The Comtron is a self-contained, ruggedized linear amplifier with a built-in 12 VDC solid-state power supply designed for mobile operation with the Gonset GSB-2 SSB Communicator or similar exciters. It operates directly from a vehicle's 12 VDC electrical system.
Covers the entire 2-meter band (including MARS and CAP frequencies) across AM, CW, FM, and SSB modes.
Uses a single fan cooled 4X150A tube in the amplifier section. It can operate in class AB2 with as low as 5 watts of drive, or in class C with up to 30 watts of drive. Typical output power is 90 watts with SSB or AM excitation in AB2, or 120 in class C with FM.
It features an internal DC-to-DC converter providing a 1000-volt high-voltage supply, a self-adjusting bias supply, and an internal blower to cool both the 4X150A and the solid-state power supply heat sink.
Probably discontinued by 1969.