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Chiliofono I (1)

Chiliofono I ; Marelli Radiomarelli (ID = 203569) Radio
Chiliofono I ; Marelli Radiomarelli (ID = 714650) Radio Chiliofono I ; Marelli Radiomarelli (ID = 714649) Radio
Chiliofono I ; Marelli Radiomarelli (ID = 714651) Radio Chiliofono I ; Marelli Radiomarelli (ID = 477236) Radio
Chiliofono I ; Marelli Radiomarelli (ID = 714652) Radio Chiliofono I ; Marelli Radiomarelli (ID = 1036695) Radio
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Chiliofono I ; Marelli Radiomarelli (ID = 714650) Radio
Marelli Radiomarelli: Chiliofono I [Radio] ID = 714650 550x700
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For model Chiliofono I (1), Marelli (Radiomarelli); Sesto San Giovanni (MI)
 
Country:  Italy
Manufacturer / Brand:  Marelli (Radiomarelli); Sesto San Giovanni (MI)
Year: 1931/1932 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 8: 124 124 124 124 127 145 145 180
Wave bands Broadcast only (MW).
Details Record Player (not changer)
Power type and voltage Alternating Current supply (AC) / 110-250 Volt
Loudspeaker -Loudspeaker incorporated, but system not known.
Power out
from Radiomuseum.org Model: Chiliofono I - Marelli Radiomarelli; Sesto
Material Wooden case
Shape Console, Lowboy (legs < 50 %).
Dimensions (WHD) 800 x 1100 x 445 mm / 31.5 x 43.3 x 17.5 inch
Price in first year of sale 3,700.00 ITL
Collectors' prices  
Source of data Guida Pratica Antique Radio II (2000)
Mentioned in La moderna Supereterodina, Ravalico, 1938 (pag. 371)
Literature/Schematics (1) -- Original prospect or advert

Model page created by Alessandro De Poi. See "Data change" for further contributors.



All listed radios etc. from Marelli (Radiomarelli); Sesto San Giovanni (MI)
Here you find 425 models, 316 with images and 244 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.



 


Forum contributions about this model
Marelli Radiomarelli: Chiliofono I
Threads: 1 | Posts: 1
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marelli: The strange volume control of the 'Chiliofono'
Emilio Ciardiello
21.Nov.07
  1 Dear all,

in the Forum thread ‘Old capacitor marking’ Prof. Dietmar illustrated several non-conventional volume control circuits used in the early age of the radio. This review recalled me the strange solution I found in the model ‘Chiliofono’, produced in Italy by Radiomarelli, in the very late twenties. This huge TRF receiver used a voltage divider, from the screen grid voltage (about 120VDC) to ground, to give a positive bias to the cathodes of the first two RF amplifier stages. The volume control is encircled in the diagram below. Considering the combined action of the cathode currents and of the current flowing from the power supply, the DC voltage on both cathodes roughly varied from 2V to 40V. The result was similar to the grid bias illustrated by Prof. Dietmar in the circuit of Fig. 172, the transconductance of the tubes decreasing when the positive cathode voltage was increased. The relatively high current passing in the volume control potentiometer asked for a wirewound type. By the way, the radio used a double section potentiometer, the second section wired as a variable attenuator on the phono pick-up.

                                       
 
Marelli Radiomarelli: Chiliofono I
End of forum contributions about this model

  
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