TRF without regeneration; Neutrodyne. Power type and voltage. Alternating Current supply (AC) / 110 Volt. For headphones or amp. Philco, Philadelphia Stg. Tablemodel, Box – most often with Lid (NOT slant panel). 24.25 x 8 x 11 inch / 616 x 203 x 279 mm. Model 511 was part of Philco’s first family of radio receivers introduced in 1928. It has a common chassis with all other 1928 Philco radio models.