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Three circuit  AC TRF receiver Cabinet comprising  "Arbolite" panels fitted onto a steel frame. Lockable lift-up lid. Drum-drive scale. On the right of the scale the on/off/wave range selector. Wave ranges are 200-600 and 800-2000 meters. In the left side panel, a volume control knob is visible, in the right panel the tuning knob. This was the first Philips radio with one knob tuning. It is a remarkably heavy receiver: 21.6 kilos. The design of the radio started in the spring of 1928. A demo-receiver was presented at the Jaarbeurs trade fair in September 1928, but because of technical problems and lack of facilities, production slowly started in January 1929. At the start of the summer an advertising campaign started in The Netherlands. From that time on enough receivers could be produced in the new factory in Eindhoven. In spite of the price (fl 350,-) it was a popular radio that has won a number of prizes and was produced until 1932. Total production exceeded 120,000. Because of the long production period, a number of changes were made. In receivers with a chassis number below 20,000 both HF tubes are regulated with the same screen grid voltage, in later models only one tube is used. Models with a chassis number above 60,000 can also be used with a frame antenna, like the Philips 4104. Data Valves   Circuit   Serial numbers: 3209 (PSA: 29454, HF block: 29276) Dimensions (w×h×d): 49.5 × 27.5 × 23.5 cm Weight: 21.6 kilos Made in: 1928-1932 Purchased in: 2011 Click an a valve for more information Click on the pdf-logo to open             front Top Publicity picture of a woman with a 2511. At first, Philips had trouble keeping up with demand. In the summer of 1929 the first advertising campaign started. Advertisement in Het Centrum, June 8, 1929 At the Olympia Radio Show in London the Philips 2511 was chosen as the best 4 valve receiver by Wireless World. Advertisement in newspaper NRC, November 11, 1929

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