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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment. |
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18th Mar 2022, 11:40 am | #1 |
Diode
Join Date: Mar 2022
Location: Gaeta, Italy.
Posts: 2
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G.E.C. shortwave tube receiver
Good morning everyone,
I am looking for information on this receiver (even just schematic diagram). It is probably an aeronautical receiver, it works, but I would like to restructure and align it. Thank you so much Francesco Nardi |
18th Mar 2022, 12:18 pm | #2 |
Dekatron
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
Posts: 8,932
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Re: G.E.C. shortwave tube receiver
Welcome Francesco, a very nice find and one I do not recognise.
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18th Mar 2022, 12:34 pm | #3 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,867
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Re: G.E.C. shortwave tube receiver
Coverage stopping at 20MHz fits with it being aeronautical. It's not a receiver I recognise.
David
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18th Mar 2022, 6:21 pm | #4 |
Dekatron
Join Date: Nov 2011
Location: Surrey, UK.
Posts: 4,394
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Re: G.E.C. shortwave tube receiver
Hi Francesco and welcome. That's an interesting looking set- I suppose the most familiar aviation radios around are the ones produced in huge numbers during WW2 and dumped on the surplus market, so seeing what looks like a 1950s design that would have been made in much smaller numbers makes for a change. I wonder if the large black object is a transformer associated with a vibrator, or possibly even early germanium power transistors? Looks as though there is something like a 5Y3GT or 5Z4GT rectifier nearby.
The unlabelled small knob with a white dot underneath the pitch control looks like one of the relatively modern miniature integrated "knob-pots", maybe someone had added a manual HF gain control or something like that. With just three-gang tuning and a minimum received frequency of 2MHz, the IF could be relatively high, around 1.6-1.8MHz. It's striking that the valve locations are marked with GEC's consumer valve designations, rather than their CV13x or CV40xx professional-usage codes as might be expected with avionics equipment, whether military or civil. Good luck with finding information about it, but I suspect that there are no big surprises in the circuitry, Colin |
18th Mar 2022, 7:59 pm | #5 |
Nonode
Join Date: Jun 2007
Location: Coulsdon, London, UK.
Posts: 2,163
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Re: G.E.C. shortwave tube receiver
The control knobs look similar to those on the GEC BRT 400 receiver.
That may help to date it. Are there any date codes on the large capacitors? |
18th Mar 2022, 8:08 pm | #6 |
Nonode
Join Date: Jun 2010
Location: Spalding, Peterborough, Cambridgeshire, UK.
Posts: 2,858
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Re: G.E.C. shortwave tube receiver
Sorry, cannot help either.
I really love your receiver. I just wish we had them available over here. It looks to be excellent quality build and should I think work very well, when you get it going. Best of luck with your project. Rob
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18th Mar 2022, 10:42 pm | #7 |
Diode
Join Date: Mar 2022
Location: Gaeta, Italy.
Posts: 2
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Re: G.E.C. shortwave tube receiver
Thank you all for your interventions.
I have found that the two jacks and the knob with white dot are not connected, they probably only serve to close the holes. There is no reference, date or other element to be able to recognize this. Hope someone knows the model. They can't have built just one! |
20th Mar 2022, 11:26 pm | #8 |
Hexode
Join Date: Nov 2011
Location: Chippenham, Wiltshire, UK.
Posts: 322
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Re: G.E.C. shortwave tube receiver
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30th Mar 2022, 1:54 pm | #9 |
Tetrode
Join Date: Jan 2008
Location: Shetland, UK.
Posts: 79
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Re: G.E.C. shortwave tube receiver
It must have had an associated transmitter, hence the two relays.
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