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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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18th Jul 2020, 9:28 pm | #1 |
Heptode
Join Date: Aug 2016
Location: Dumfries, Scotland, UK.
Posts: 549
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GEC " Gecophone" BC2001 a little help please
I've just acquired one and a half GEC BC2001's I need help with the following firstly Valves what I have are toast as per usual what can be used as a substitute that's relatively easy to get hold of ??
Secondly I have everything with the exception of the plug in reactance unit could anyone provide measurements Photos and values to enable me to make one please. Thirdly does anyone have scans of the instruction labels fitted to the insides of the doors please. Any help greatly appreciated I'd love to get this set up and running. |
18th Jul 2020, 10:42 pm | #2 |
Moderator
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Location: Exeter, Devon and Poole, Dorset UK.
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Re: GEC " Gecophone" BC2001 a little help please
You might want to start here
https://www.vintage-radio.net/forum/...d.php?t=141232 The member is still active Cheers Mike T
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Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk |
19th Jul 2020, 9:59 am | #3 |
Heptode
Join Date: Apr 2010
Location: West Midlands, UK.
Posts: 659
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Re: GEC " Gecophone" BC2001 a little help please
As the set is a HF Detector type something like PM1HF and PM1LF should be suitable with 2 volt LT supply or other low gm types of 4 pin triodes as the set was originally intended to be used with R or DER type valves.
I think that the instruction cards were supplied with the set for the owner to fit. Some cabinets look to have never had the cards fitted as there are no pin holes in the doors so if the cabinet you are using hasn't had them fitted, it might be appropriate not to fit them. I have one of these sets, a replica reaction unit is quite a project to make, you will need to be good and have the facilities for metalwork. I can supply details of it and scans of the cards if required, PM me and I will see what I can do. Mike. |
19th Jul 2020, 10:40 am | #4 |
Heptode
Join Date: Aug 2016
Location: Dumfries, Scotland, UK.
Posts: 549
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Re: GEC " Gecophone" BC2001 a little help please
Should probably point out I have access a profesional workshop with just about every form of lathe and milling machine so if I can get the info on the reaction unktmit shouldn't be much bother. I did think the pm series valves might be ok but the originals of course we're 6v heaters.
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19th Jul 2020, 11:40 am | #5 |
Dekatron
Join Date: Dec 2004
Location: East Yorkshire, UK.
Posts: 3,959
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Re: GEC " Gecophone" BC2001 a little help please
I had a set of plans for the reactance control, drawn by no a longer active BVWS member. After spending most of the morning searching my paper work I am unable to find them and running out of places to look.
John.
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19th Jul 2020, 7:01 pm | #6 |
Heptode
Join Date: Apr 2010
Location: West Midlands, UK.
Posts: 659
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Re: GEC " Gecophone" BC2001 a little help please
According to the 1925 Brown Bros catalogue (BVWS Reprint) the set was being supplied by then with either 2 R5(V?) valves and 6 volt accumulator or 2 DER valves (nominally 1.8 volt filaments ) with 2 volt accumulator, it doesn't say whether the same value filament rheostat was used in both versions.
The set originally used 2 R valves with a 6 volt accumulator but as the R valve's filament was rated at 4 volts 0.7 amp the rheostat should be used to reduce the voltage to this, higher voltage would considerably reduce the valve's life. 2 volt filament 4 pin valves are the only ones that are now relatively easy to find, 4 and 6 volt types haven't been used much since the late 20's. Mike. |
21st Jul 2020, 1:10 pm | #7 |
Heptode
Join Date: Aug 2016
Location: Dumfries, Scotland, UK.
Posts: 549
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Re: GEC " Gecophone" BC2001 a little help please
Out of interest any reason why American valves couldn't be used other than the bases something a bit more period looking
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21st Jul 2020, 4:09 pm | #8 |
Dekatron
Join Date: Sep 2005
Location: Seaford, East Sussex, UK.
Posts: 5,997
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Re: GEC " Gecophone" BC2001 a little help please
Yes, they are American... Later DER valves look pretty similar to the PM series.
I have a similar issue with my Marconi 41 which came without either of the two plug-in coils. I have made some replacements and wound the primary which is relatively easy as I just needed to get the resonant frequency right, the secondaries (regen and 2nd valve grid drive) will have to be done by trial and error. You could do the same. http://earlywireless.com/bc2001_picinfo.htm?LMCL=MWTN7W |
17th Nov 2020, 1:54 pm | #9 | |
Dekatron
Join Date: Dec 2004
Location: East Yorkshire, UK.
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Re: GEC " Gecophone" BC2001 a little help please
Quote:
John.
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