• Paese
• USA (Stati Uniti d'America)

• Produttore / Marca
• General Radio Company; Cambridge (MA)

• Anno
• 1936–1938

• Categoria
• Strumento da laboratorio

• Radiomuseum.org ID
• 301355

• • alternative name: GenRad

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• Numero di tubi
• 3

• Valvole
• 955 75 1-V

• Gamme d'onda
• - senza

• Tensioni di funzionamento
• Alimentazione a corrente alternata (CA) / Less than 30 W, either 42, 50, 60 Hz, 100-130V or 50 Hz, 200 to 260 Volt

• Altoparlante
• - - Nessuna uscita audio.

• Materiali
• Mobile in legno

• Radiomuseum.org
• Modello: Vacuum-Tube Voltmeter 726-A [75] - General Radio Company;

• Forma
• Soprammobile a leggio (pannello inclinato).

• Dimensioni (LxAxP)
• 9.5 x 14 x 8.5 inch / 241 x 356 x 216 mm

• Annotazioni

• This instrument is listed with picture in the General Radio Co, "Catalog J" from September 1936. On page 54 it is called 726-A Thermionic Voltmeter but on later pages Type 726-A Vacuum-Tube Voltmeter (page 82). We find the description on pages 116 and 117. There is given the tube 75-type. The next catalog (K) is from 1939 and there the instrument carries the tube 6Q7G. See the modelpage here.

  Range 1.5 / 5 / 15 / 50 / 150 V AC, 20 Hz - 50 MHz; with a probe containing the 955 tube. Catalog 1939 mentions less than 1 % between 20 cycles and 50 megacycles. With the probe tips removed, at 100 megacycles the voltage indicated is about 3 % larger than accross heh probe terminals.

  Important: Open the probe head only on the "Low" end: The two screws and the Plug "low" to get to the tube 955.

  There are at least two versions regarding the tube line up: Early models (at least up to Serial Nr. 251) use the tube 75 (From Tungsram) with the 6-Pin-Base, which arrived on the market 1933 - and later sets use the 6Q7G from 1936 with Octal base. Since General Radio Copmpany-Catalog H from April 1935 does not mention the type 726-A (or 726), it is clear that the first introduction via catalog was in 1936. 

   

• Peso netto
• 17.5 lb (17 lb 8 oz) / 7.945 kg

• Prezzo nel primo anno
• 165.00 $

• Letteratura / Schemi (1)
• -- Original-techn. papers.

• Letteratura / Schemi (2)
• - - Manufacturers Literature (Catalog J from September 1936 - for tube type 75, on page 116.)

• Autore
• Modello inviato da Ernst Erb. Utilizzare "Proponi modifica" per inviare ulteriori dati.

• Altri modelli

• In questo link sono elencati 238 modelli, di cui 212 con immagini e 128 con schemi.
  Elenco delle radio e altri apparecchi della General Radio Company; Cambridge (MA)