Note
The HM-15 is the third iteration of the AM-2. The AM-2 was introduced in 1957. In 1962 the AM-2 was given a new paint job and called the HM-11. Then in 1966 the HM-11 was put in to a new “low boy” cabinet, painted to match the SB series and renamed the HM-15. All of these are really the same device.
The HM-15 will handle up to 2000 watts PEP and will operate from 160-6 meters. It also will operate with 50 or 75Ω lines depending on the pick-off resistors chosen during construction.
For a little more history on this unit refer to AM-2 and HM-11. In 1970 the HM-15 would itself be changed into the HM-102—the last of the line.
References:
Review. QST. Nov 1966, p. 44.
Review. 73 Amateur Radio. Sep. 1966, p. 68.
Power handling capability: 2000 watts PEP
Input and output impedance: 50-52 or 70-75Ω (wiring option)
Frequency coverage: 160 to 6 meters
Meter: 100 µA full scale
Photos, general information and specifications from "Heathkit: A Guide to the Amateur Radio Products," by Chuck Penson, WA7ZZE. Used with permission.