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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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13th Jan 2020, 6:24 pm | #1 |
Octode
Join Date: Feb 2018
Location: Southampton, Hampshire, UK.
Posts: 1,063
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Trying to put a vintage kit radio together
Of the many bits and pieces I have collected over the years, here is what appears to be an incomplete multiband radio kit. There is no circuit diagram nor are there any instructions. The PCB is for a superhet radio, but there is no space to solder on an oscillator coil or on/off volume control. I have all the required transistors, diode and IFTs for it, including the transformer.
However, I also have a set of four coils, including the MW antenna coil (with three terminals, as opposed to the usual four wires). There is no PCB for these to be mounted on to. Can anyone please help me identify which coil is for which band and how they should be connected to the main PCB to complete the set ? If anyone knows of a similar radio or kit, that might help too. Last edited by Jolly 7; 13th Jan 2020 at 6:26 pm. Reason: Additional details |
13th Jan 2020, 9:17 pm | #2 |
Guest
Posts: n/a
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Re: Trying to put a vintage kit radio together
I would hazard a guess the 1..5 got to a wavechange switch, tuning capacitor and the oscillator and aerial coils. I can't see a detector diode. It would be fairly obvious what to do if the circuit is reverse engineered.
Looks like a fun challenge. |
14th Jan 2020, 1:21 am | #3 |
Octode
Join Date: Feb 2018
Location: Southampton, Hampshire, UK.
Posts: 1,063
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Re: Trying to put a vintage kit radio together
Thanks for that. The AC127 seems to be a printing error. There ought to be a detector diode there instead, connected to IFT3.
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14th Jan 2020, 8:40 am | #4 |
Nonode
Join Date: Jun 2016
Location: Bognor Regis, West Sussex, UK.
Posts: 2,300
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Re: Trying to put a vintage kit radio together
You have not posted a picture of the pcb tracks but I would guess that the base and collector of the AC127 are connected together to use it as a diode. The AC127 is after all a germanium transistor.
Peter |
14th Jan 2020, 9:24 am | #5 |
Nonode
Join Date: Jun 2010
Location: Spalding, Peterborough, Cambridgeshire, UK.
Posts: 2,859
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Re: Trying to put a vintage kit radio together
Looks like that is just the if and audio pcb and there should be a second one for osc and rf ranges.
Rob
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14th Jan 2020, 3:16 pm | #6 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 14,007
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Re: Trying to put a vintage kit radio together
Yes that's the IF-and-audio board; there would have been another for the RF/frequency0changer end.
Interesting the mention of "Stancor" transformer - they were one of the big US transformer-makers in the last century - http://www.stancor.com/index.html |
14th Jan 2020, 7:36 pm | #7 | |
Guest
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Re: Trying to put a vintage kit radio together
Quote:
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14th Jan 2020, 7:45 pm | #8 |
Moderator
Join Date: Jun 2003
Location: Oxford, UK
Posts: 27,970
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Re: Trying to put a vintage kit radio together
The coils look a bit ancient for the PCB, which uses a typical late 60s Si Lockfit / AC128 transistor mix.
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