This amplifier build on GU-43B tetrode.

This tetrode is used for wideband power amplification at frequencies up to 100 MHz in RF equipment. For more information see http://www.ok1rr.com/tubes/gu43b.pdf.

Input power from 35 to 40 Watt.

Output power up to 300 Watt.

Frequency band from 3.5 to 28 MHZ