RM Italy KL-503 CB/10m Linear Amplifier 25–30 MHz, 300W, 6-Power Selector, 12V

The RM Italy KL-503 is a 300W linear amplifier for the 25–30 MHz band — covering the full CB band (27 MHz) and the 10m amateur band (28–30 MHz). Designed for mobile or base station use from a 12V supply, it accepts 1–6W of drive power across all modes (AM, FM, SSB, CW), making it well suited to standard CB and 10m transceivers operating at typical output levels.

A six-position power selector on the front panel allows output power to be adjusted to suit operating conditions or licence requirements. An RX preamplifier with electronic switching — activated via a front panel switch — boosts received signal sensitivity when needed. Made in Italy.

Note: The KL-503 HD variant accepts up to 35W of drive power — choose the HD if your transceiver outputs more than 6W.

Key Features

• Frequency: 25–30 MHz (CB band & 10m amateur)
• Output power: 300W
• Input power: 1–6W (all modes)
• Modes: AM, FM, SSB, CW
• 6-position power selector (front panel)
• RX preamplifier with electronic switching
• Power supply: 13.8V DC ±1V, 40A
• Max input current: 30A
• Fuse: 3 × 10A fast blow (5×20mm)
• Dimensions: 300 × 190 × 67mm
• Made in Italy

Technical Specifications

• Frequency: 25–30 MHz
• Output power: 300W
• Input power: 1–6W
• Modes: AM, FM, SSB, CW
• Power supply: 13.8V DC ±1V, 40A
• Input current: 30A max
• Input VSWR: 1.1–1.5:1
• Fuse: 3 × 10A fast (5×20mm)
• Dimensions: 300 × 190 × 67mm