Ameritron ARB-704 Amplifier to Transceiver Interface Brand new in box- Never Used $45.00 http://www.ameritron.com/Product.php?productid=ARB-704 With optional PNP-10MY interface cable for Yaesu FT-450,950,1200 $60.00 http://www.ameritron.com/Product.php?productid=PNP-10MY Price includes shipping. Email me at my QRZ address for PayPal information. "Why you need the ARB-704 Amplifiers can damage radios if the amplifier has too much relay control voltage, voltage spikes, or excessive current on the relay control line. Such damage often appears as "stuck" or "sticky" transmit relays in exciters or shorted transistors on transmit control lines. In most cases where the radio is damaged, the system transmits normally but the external amplifier stays locked in a "transmit" mode. This prevents receive signals from coming through the amplifier with normal levels whenever the amplifier is in the "ON" or "OPERATE" position." Price includes shipping. Email me at my QRZ address for PayPal information.