9-X-571 Ch= RC-1079

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

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  • Anno
  • 1949
  • Categoria
  • Radio (o sintonizzatore del dopoguerra WW2)
  • Radiomuseum.org ID
  • 54105
    • alternative name: RCA Manufacturing || Victor Talking Machine

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 Specifiche tecniche

  • Numero di tubi
  • 5
  • Principio generale
  • Supereterodina (in generale); ZF/IF 455 kHz; 2 Stadi BF
  • N. di circuiti accordati
  • 6 Circuiti Mod. Amp. (AM)
  • Gamme d'onda
  • Solo onde medie (OM).
  • Tensioni di funzionamento
  • Alimentazione universale (doppia: CC/CA) / 115 Volt
  • Altoparlante
  • AP magnetodinamico (magnete permanente e bobina mobile) / Ø 8 inch = 20.3 cm
  • Potenza d'uscita
  • 1.75 W (qualità ignota)
  • Materiali
  • Bachelite
  • Radiomuseum.org
  • Modello: 9-X-571 Ch= RC-1079 - RCA RCA Victor Co. Inc.; New
  • Forma
  • Soprammobile compatto/con bordi arrotondati/midget senza pulsantiera/tastiera.<= 35 cm (Sometimes with handle but for mains only).
  • Dimensioni (LxAxP)
  • 320 x 240 x 210 mm / 12.6 x 9.4 x 8.3 inch
  • Annotazioni
  • 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.
  • Peso netto
  • 4.6 kg / 10 lb 2.1 oz (10.132 lb)
  • Fonte esterna dei dati
  • Ernst Erb
  • Riferimenti schemi
  • Rider's Perpetual, Volume 20 covering 1950
  • Letteratura / Schemi (1)
  • RCA Victor Instruments Service Notes 1949

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Il modello 9-X-571 fa parte delle collezioni dei seguenti membri.

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Discussioni nel forum su questo modello: RCA RCA Victor Co.: 9-X-571 Ch= RC-1079

Argomenti: 1 | Articoli: 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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