Vacuum-Tube Voltmeter (Thermionic) 726-A 75
General Radio Company; Cambridge (MA)
- 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
- 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)
Collezioni
Il modello Vacuum-Tube Voltmeter (Thermionic) fa parte delle collezioni dei seguenti membri.