9-X-571 Ch= RC-1079

RCA (RCA Victor Co. Inc.); New York (NY)

Data
Forum
Pictures
Collections

  • Year
  • 1949
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 54105
    • alternative name: RCA Manufacturing || Victor Talking Machine

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

 Technical Specifications

  • Number of Tubes
  • 5
  • Main principle
  • Superheterodyne (common); ZF/IF 455 kHz; 2 AF stage(s)
  • Tuned circuits
  • 6 AM circuit(s)
  • Wave bands
  • Broadcast only (MW).
  • Power type and voltage
  • AC/DC-set / 115 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 8 inch = 20.3 cm
  • Power out
  • 1.75 W (unknown quality)
  • Material
  • Bakelite case
  • from Radiomuseum.org
  • Model: 9-X-571 Ch= RC-1079 - RCA RCA Victor Co. Inc.; New
  • Shape
  • Tablemodel without push buttons, Mantel/Midget/Compact up to 14
  • Dimensions (WHD)
  • 320 x 240 x 210 mm / 12.6 x 9.4 x 8.3 inch
  • Notes
  • RCA Victor Model 9X-571 shows the color: maroon. Similar model 5-X-572 (#5X572) is in ivory. Dial lamps: 2 Mazda type 1490, 3.2V, 0.16 amp.
  • Net weight (2.2 lb = 1 kg)
  • 4.6 kg / 10 lb 2.1 oz (10.132 lb)
  • External source of data
  • Ernst Erb
  • Circuit diagram reference
  • Rider's Perpetual, Volume 20 covering 1950
  • Literature/Schematics (1)
  • RCA Victor Instruments Service Notes 1949

 Collections | Museums | Literature

Collections

The model 9-X-571 is part of the collections of the following members.

 Forum

Forum contributions about this model: RCA RCA Victor Co.: 9-X-571 Ch= RC-1079

Threads: 1 | Posts: 4

Static during reception with this model is often caused by internal leakage in the IF transformers caused by silver creap in the internal capacitors that causes leakage current between the primary and secondary.

Note: use care when desoldering and soldering to these IF transformer pins because excessive heat will cause the plastic base surrounding the pin to melt and the pin to loosen which can cause internal connections to break.

This leakage can be checked by disconnecting the secondary (both terminals) of the IF transformer. Test one transformer at a time.  Temporarily connect the two wires together that were disconnected from the transformer secondary so the remaining radio circuitry will not be an open circuit. Connect a high impedance DC voltmeter, such as a vacuum tube voltmeter or a digital voltmeter, to either of the disconnected secondary terminals. Turn on the radio and check for the presence of any DC voltage reading on the meter. This might be a jumpy reading. A transformer with good capacitors will not have any voltage during this test.

If leakage is found it can usually be eliminated by disassembling the IF transformer and making repairs. Sometimes careful visual inspection will show black wiskers on the mica capacitor sheet between the primary and secondary sides which can be scraped away. Sometimes the mica sheets can be carefully cut or broken to separate the primary side from the secondary side. Sometimes the mica sheet capacitors must be disconnected or removed and replaced by temperature-stable ceramic or mica capacitors.

Paul Moyer, 24.Jan.07

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