As found at a local estate. Vintage ham radio home made piece ? With knobs on front. I think this is for a linear amplifier – signal tuner – but you ham radio people will know what this is when looking at pictures. Inside has one penta pl-5d22 tube. 1 traide f-22a filament transformer. Tuning capacitors – ef johnson & cardwell. Underneath is a b&w fc-15a. Has box front and sides – no top or back on this – and wear to the finish on the box cabinet. Measures 19″ x 14″(front panel) x 13 deep. We will be listing more ham radio items from the same estate.The item “Vintage Ham Radio Linear Amplifier Signal Tuner Box W Penta PL-5D22 Tube” is in sale since Saturday, February 28, 2015. This item is in the category “Consumer Electronics\Radio Communication\Ham, Amateur Radio\Ham Radio Amplifiers”. The seller is “nutsk42″ and is located in Jacksonville, Florida. This item can be shipped to United States.