J.W. One/2 Gallon 505 American tube linear amplifier. It has four Zenith tubes, and is rated at 500W, see pics. Tested for function and working. Has Operate /Standby, Off/On and AM/ SSB switches, an RF Tune meter, and large driver and antenna tune control knobs. Also has a variable power knob. This item is heavy and will be very carefully packed and shipped from Tucson AZ. Incredible USA made amp. Asking $240 shipped. Zelle preferred. Offers ok, no trades.