- Produttore / Marca
- Eddystone (Brand), Stratton and Co., Ltd., Eddystone Radio Ltd.; Birmingham
- Anno
- 1962–1970
- Categoria
- Ricevitore professionale (può includere bande amatoriali)
- Radiomuseum.org ID
- 109326
Clicca sulla miniatura dello schema per richiederlo come documento gratuito.
- Numero di tubi
- 12
- Principio generale
- Supereterodina con stadio RF; ZF/IF 450 kHz
- Gamme d'onda
- Gamme d'onda nelle note.
- Tensioni di funzionamento
- Alimentazione a corrente alternata (CA) / 110-125; 200-250; Volt
- Altoparlante
- - Per cuffie o amplificatori esterni
- Materiali
- Mobile di metallo
- Radiomuseum.org
- Modello: 940 - Eddystone Brand, Stratton and
- Forma
- Soprammobile basso, con andamento orizzontale (grosse dimensioni).
- Dimensioni (LxAxP)
- 425 x 222 x 381 mm / 16.7 x 8.7 x 15 inch
- Annotazioni
- General coverage receiver, 480-1030 kHz / 1,03-2,4 / 2,4-5,4 / 5,4-12,7 / 12,7-30 MHz; AM, SSB (BFO);
S-meter, crystal filter.
- Peso netto
- 19.5 kg / 42 lb 15.2 oz (42.952 lb)
- Prezzo nel primo anno
- 153.00 GBP
- Fonte dei dati
- -- Original-techn. papers.
- Autore
- Modello inviato da un iscritto da A. Utilizzare "Proponi modifica" per inviare ulteriori dati.
- Altri modelli
-
In questo link sono elencati 255 modelli, di cui 125 con immagini e 46 con schemi.
Elenco delle radio e altri apparecchi della Eddystone (Brand), Stratton and Co., Ltd., Eddystone Radio Ltd.; Birmingham
Discussioni nel forum su questo modello: Eddystone Brand,: 940
Argomenti: 2 | Articoli: 2
After using the set for some time, I noticed spurs at several points on the highest frequency range. Some investigation with a hand-held scanner revealed that the ECC189 was oscillating quite strongly at about 60 MHz. Further checks revealed that the problem was also present on the 2.4 - 5.4 MHz range, but I hadn't noticed because aerial noise drowned out the offending spurious responses. They were audible when the aerial was replaced with a 47-Ohm resistor. The spurs on the highest frequency range are also very quickly "tuned through" and may not be noticed.
The ECC189 has a grid stopper, and the grid of the second half of the cascode combination is directly grounded via a number of almost inaccesible capacitors. I am not convinced that these have deteriorated, and suspect that the problem may be caused by my using a different make of ECC189 from that originally in the set. Its also possible that many 940s had this problem from new. None of my ECC189s are Brimar or Mullard.
The problem was solved by using 47 Ohm anode stoppers wired to the wavechange switch as in the attached photo. The performance of the set hasn't changed with these additions. Using a single resistor was considered, and rejected because of the difficulty of accesing the valve base.
Comments invited - Bryce
Allegati
- Eddystone 940 RF Anode Stoppers (45 KB)
Bryce Ringwood, 14.Jun.09
The following may be of interest:
An article in Short Wave Magazine (Aug to October 1988) issues gave instructions for "restoring" (in fact modifying) the Eddystone 940. When purchasing a 940, be aware that it may have been modified and that these changes may not be what you want. The changes to the i.f transformers may be difficult to reverse.
Bryce Ringwood, 13.Jun.08