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Toonzeef (Tone sieve) 4004

Toonzeef 4004; Philips; Eindhoven (ID = 1160045) Misc Toonzeef 4004; Philips; Eindhoven (ID = 1160046) Misc
Toonzeef 4004; Philips; Eindhoven (ID = 1160047) Misc
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Toonzeef 4004; Philips; Eindhoven (ID = 1160045) Misc
Philips; Eindhoven: Toonzeef 4004 [Misc] ID = 1160045 594x991
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For model Toonzeef (Tone sieve) 4004, Philips; Eindhoven (tubes international!); Miniwatt:
Philips 4004 and 2514
Country:  Netherlands
Manufacturer / Brand:  Philips; Eindhoven (tubes international!); Miniwatt
Year: 1927–1935 ? Category: Miscellaneous (Other, Various) - see notes
Main principle RF Converter/Adapter (not voltage converter); something special ? Please give information (notes)
Power out
from Model: Toonzeef 4004 - Philips; Eindhoven tubes
Material Bakelite case
Dimensions (WHD) 30 x 15 x 40 mm / 1.2 x 0.6 x 1.6 inch
Notes Low pass filter for Philips loudspeakers to reduce the sharp high tones.
A Philips 2514 has a B443 (or PM24) output pentode that is fed with 150 volt and a current of 15 mA. The optimal load is therefore 150/0.015 = 10.000 ohm. You wonder why Philips advised loudspeakers with an impedance of 2.000 ohm for this radio, for instance the Philips 2007? The reason for this is that the impedance of loudspeakers in those days was measured at frequencies around 200 Hz. At 1000 Hz the impedance of a Philips 2007 is already over 4x times higher. This explains why Philips delivered a so-called "Toonzeef" (tone sieve) with these radios, to compensate for the fact that the yield for high tones with such a loudspeaker, connected to a B443 (or PM24), is much higher than for low tones. This problem was corrected with Philips 4004 "toonzeef" (Tone sieve). The regular value of the Philips 4004 plugs is 10 nF.
Net weight (2.2 lb = 1 kg) 0.050 kg / 0 lb 1.8 oz (0.11 lb)

Model page created by Rudie Dorrepaal. See "Data change" for further contributors.

All listed radios etc. from Philips; Eindhoven (tubes international!); Miniwatt
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