radiomuseum.org
Please click your language flag. Bitte Sprachflagge klicken.

940

940; Eddystone, (ID = 630564) Commercial Re
940; Eddystone, (ID = 464369) Commercial Re
Use red slider bar for more.
940; Eddystone, (ID = 464369) Commercial Re
Eddystone,: 940 [Commercial Re] ID = 464369 400x213
Select picture or schematic to display from thumbnails on the right and click for download.
For model 940, Eddystone, Birmingham
 
Country:  Great Britain (UK)
Manufacturer / Brand:  Eddystone, Birmingham
alternative name
 
Stratton & Co.Ltd.; Birmingham
Year: 1962–1970 Category: Commercial Receiver (may include amateur bands)
Valves / Tubes 12: ECC189 6BA6 6AJ8 6C4 6BA6 6BA6 6AL5 6BE6 12AU7 6AM5 6AM5 GZ34 or 5Z4G VR150-30
Main principle Superhet with RF-stage; ZF/IF 450 kHz
Wave bands Wave Bands given in the notes.
Details
Power type and voltage Alternating Current supply (AC) / 110-125; 200-250; Volt
Loudspeaker - For headphones or amp.
Power out
from Radiomuseum.org Model: 940 - Eddystone, Birmingham
Material Metal case
Shape Tablemodel, low profile (big size).
Dimensions (WHD) 425 x 222 x 381 mm / 16.7 x 8.7 x 15 inch
Notes 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.
Net weight (2.2 lb = 1 kg) 19.5 kg / 42 lb 15.2 oz (42.952 lb)
Price in first year of sale 153.00 GBP
Source of data -- Original-techn. papers.

Model page created by a member from A. See "Data change" for further contributors.



All listed radios etc. from Eddystone, Birmingham
Here you find 234 models, 88 with images and 34 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.



 


Forum contributions about this model
Eddystone,: 940
Threads: 2 | Posts: 2
Hits: 1354     Replies: 0
eddystone: 940 - Parasitic Oscillations;
Bryce Ringwood
14.Jun.09
  1

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

 

Attachments

 
Hits: 1787     Replies: 0
eddystone: 940;
Bryce Ringwood
13.Jun.08
  1

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. 

 
Eddystone,: 940
End of forum contributions about this model

  
rmXorg