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