RM Italy KL503 HD 10-Meter Linear Amplifier – 300W Output

Boost your signal with the RM Italy KL503 HD – a high-performance HF linear amplifier designed specifically for the 10-meter amateur radio band (25–30 MHz). Whether you're a base station enthusiast or mobile operator, this amplifier offers reliable performance, compact form factor, and impressive power handling.

🔧 Key Features:

• Frequency Range: 25–30 MHz (10m Band)
• Output Power: Up to 300 Watts
• Compatible Modes: SSB, CW, AM, FM, and Digital
• Transistor Design: 8x RM3 MOSFET + 1x RM4 MOSFET Driver
• Input Power Range: 1–35W max
• Supply Voltage: 13VDC ± 1V (40A required)
• Bypass Capability: Passes up to 50W when OFF
• Receive Preamplifier: Enhances weak signal performance
• 6-level Input Attenuator: For output control
• LED Indicators: Clear status for TX, preamp, and power

💡 Why Choose the KL503 HD?

This amplifier is the "High Drive" version, designed to be used with both 10M Mobile radios and QRP (4W AM) radios, ideal for amateur radio operators looking to enhance their 10m band performance. Its small footprint, powerful output, and flexible mode compatibility make it a favorite among ham operators worldwide.

⚠️ Important: The use of linear amplifiers is regulated in many countries. Ensure you comply with local laws. This unit is intended for licensed amateur radio use only.

📦 What’s in the Box:

• KL503 HD Amplifier
• Power cable with connector
• Quick start guide

🛡️ Warranty: 12-month manufacturer’s warranty (RM Italy is in Italy) with proof of purchase. Damage due to misuse (over-driving, high SWR) or improper input power is not covered.

🇨🇦 Looking to Buy in Canada?

This product is available through Fleetwood Digital, a trusted Canadian source for amateur radio and CB equipment. Shop with confidence — no cross-border delays, no duties, and expert local support.

Please note, linear amplifiers require appropriate licensing to install and operate. These units are not designed for a 100% duty cycle. All units are fully tested and inspected before shipping; however there are no returns and a limited (Manufacturers) warranty applies. Setup and testing should only be performed by qualified individuals.