• Country
• United States of America (USA)

• Manufacturer / Brand
• Philco, Philadelphia Stg. Batt. Co.; USA

• Year
• 1934/1935

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 50479

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Tubes
• 10

• Valves / Tubes
• 78 6A7 78 78 37 75 42 42 42 5Z3

• Main principle
• Superhet with RF-stage; ZF/IF 260 kHz

• Wave bands
• Broadcast and Short Wave (SW).

• Power type and voltage
• Alternating Current supply (AC) / 115 Volt

• Loudspeaker
• Electro Magnetic Dynamic LS (moving-coil with field excitation coil)

• Power out
• 15 W (unknown quality)

• Material
• Wooden case

• from Radiomuseum.org
• Model: 201X - Philco, Philadelphia Stg. Batt

• Shape
• Console with any shape - in general

• Dimensions (WHD)
• 26 x 41.5 x 13 inch / 660 x 1054 x 330 mm

• Notes
• The Philco model 201X (1934-35) was the second high fidelity model introduced by Philco. The ten-tube two-band (BC + SW 4.2-12 MHz) chassis has variable IF bandwidth to trade off selectivity versus fidelity, controlled by a three-gang potentiometer to adjust the Q of two of the three IF transformers and the gain of both IF stages. Unlike most radios of its day, which were restricted to about 4 kHz of audio bandwidth, the 201X has 7.5 kHz of bandwidth at its maximum fidelity setting. The circuit includes a 10 kHz audio filter to remove the high pitched heterodyne that could be caused by the carrier of an adjacent channel. In addition to the fidelity-selectivity control, which functions somewhat like a treble control, there is a bass compensation switch on the side of the cabinet. The chassis has a shadow meter (tuning aid) with its own dedicated control tube (unlike other Philco designs where the shadow meter simply indicates B+ current to the RF and/or IF stages). The push-pull output stage, with one 42 driver tube and two 42 output tubes, delivers 15 watts of undistorted output.
  
  The cabinet is a floor-type console with inclined sounding board.
  
  Philco had introduced another high fidelity model earlier in 1934 - the 200X. It was similar to model 201X but covered only the broadcast band.
  
  A related model is the 509X super deluxe high fidelity radio-phonograph which used the 201 chassis.

• Price in first year of sale
• 250.00 $

• External source of data
• Ernst Erb

• Circuit diagram reference
• Rider's Perpetual, Volume 6 = 1935 and before

• Mentioned in
• Philco Radio 1928-1942

• Literature/Schematics (1)
• Philco 1928-36 Wiring Diagrams, Parts Lists, and Essential Service Data

• Other Models

• Here you find 4041 models, 2218 with images and 3690 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Philco, Philadelphia Stg. Batt. Co.; USA