First all-transistor phonograph left|thumb|Philco all-transistor model TPA-1 phonograph, developed and produced in 1955 right|thumb|Philco all-transistor model TPA-1 phonograph – Radio and Television News magazine, issue October 1955 In 1955, Philco developed and produced the world's first all-transistor phonograph models TPA-1 and TPA-2, which were announced in the June 28, 1955 edition of The Wall Street Journal.The Wall Street Journal, "Phonograph Operated On Transistors to Be Sold by Philco Corp.", June 28, 1955, page 8. Philco started to sell these all-transistor phonographs in the fall of 1955, for the price of $59.95. The October 1955 issue of Radio & Television News magazine (page 41), had a full page detailed article on Philco's new consumer product. The all-transistor portable phonograph TPA-1 and TPA-2 models played only 45rpm records and used four 1.5 volt "D" batteries for their power supply. The "TPA" stands for "Transistor Phonograph Amplifier". Their circuitry used three Philco germanium PNP alloy-fused junction audio frequency transistors. After the 1956 season had ended, Philco decided to discontinue both models, for transistors were too expensive compared to vacuum tubes, but by 1961 a $49.95 ($ in ) portable, battery-powered radio-phonograph with seven transistors was available.
First all-transistor phonograph left|thumb|Philco all-transistor model TPA-1 phonograph, developed and produced in 1955 right|thumb|Philco all-transistor model TPA-1 phonograph – Radio and Television News magazine, issue October 1955 In 1955, Philco developed and produced the world's first all-transistor phonograph models TPA-1 and TPA-2, which were announced in the June 28, 1955 edition of The Wall Street Journal.The Wall Street Journal "Phonograph Operated On Transistors to Be Sold by Philco Corp.", June 28 1955, page 8. Philco started to sell these all-transistor phonographs in the fall of 1955 for the price of $59.95. The October 1955 issue of Radio & Television News magazine (page 41), had a full page detailed ,article on Philco's new consumer product. The all-transistor portable phonograph TPA-1 and TPA-2 models played only 45rpm records and used four 1.5 volt "D" batteries for their power supply. The "TPA" stands for "Transistor Phonograph Amplifier" Their circuitry used three Philco germanium PNP alloy-fused junction audio frequency transistors. After the 1956 season had ended, Philco decided to discontinue both models, for transistors were too expensive compared to vacuum tubes, but by 1961 a $49.95 ($ in ) portable, battery-powered radio-phonograph with seven transistors was available.