RM Italy AD 203, an internal linear amplifier designed to be installed in place of the transceiver's speaker.
Features include the following:
Frequency: 25-30MHz
Input Power: 2.5- 4 W
Input Power SSB: 1-20 W
Output Power PEP: 100-150W PEP
Fuse: 12A
Size: 4" x 4" x 1"