Three circuit  AC TRF receiver
Cabinet comprising  "Arbolite" panels fitted onto a steel frame. Lockable lift-up lid. The drum-drive scale is to the left of the key, the on/off/wave range selector is to the right of the key. Wave ranges are 200-600 and 800-2000 meters. The volume knob is on the left side panel; the tuning knob is on the right side panel. This was the first Philips radio with one knob tuning. The design is by ir. Louis Kalff.
It is a remarkably heavy receiver: it weighs 21.6 kilos.
The technical 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 November 1928. At the start of the summer of 1929, 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 330,-) 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.
The original price was f 330,-.
The user manual (in Dutch).
Data Valves   Circuit  
Serial numbers: 3209 (PSA: 29454, HF block: 29276)
Dimensions (whd): 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

What was broadcast in 1928?

 

Listen to "Rhythm King" by the Coon-Sanders Orchestra, vocals by Carlton Coon, recorded December 12, 1928

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Publicity picture of a woman with a 2511.
Confirmation of the application for two guarantee certificates. The buyer bought both the Philips 2511 radio and the Philips 2088 loudspeaker.
Warranty certificate for a Philips 2511 with serial number 68355

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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