Note
he SB-604 contains only a five-by-seven-inch 3.2Ω speaker. There are no indicators or displays of any kind behind the red plastic window. The rest of the cabinet is empty but is designed to hold the HP-1144 power supplies for use with the SB-104(A) transceiver. There are holes in the bottom of the cabinet permitting the power supply to be secured with screws. The 604 is finished in Heath’s standard two-tone green wrinkle paint.
Speaker size: 5 x 7
Impedance: 3.2Ω
Resonant frequency: no stated
Frequency response: 300 to 3000 Hz
Magnet: 3.16 oz
Photos, general information and specifications from "Heathkit: A Guide to the Amateur Radio Products," by Chuck Penson, WA7ZZE. Used with permission.
