Vintage Triad F-51X filament transformer.  Secondary 6.3 volts 2 amps, 5.0 volts 2 amps, primary 115 volts 60 Hz.  Secondaries have a common lead.  About 3.25 inches by 2.25 inches by 2 inches,  1 pounds 3 ounces.

Shipping can be combined with other parts and tubes from my ebay store for savings.  Add to cart then request total.