I was given a radio...
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Location: Sydney, NSW
Member since 28 July 2017
Member #: 2144
Postcount: 12
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Hi. I am completely new to this site and new to antique radios.
I recently came across an old wooden tabletop valve radio that was kept in the back of someones shed. When I asked them about it they said they didn't want it so I grabbed it with a few ideas in mind for it, but before I did anything with it other than wipe it down and hit it with some compressed air to remove years of dust, I wanted to make sure that it wasn't some missing piece of history that might be worth something. I don't want to sand back the cabinet and recoat it and then find out I just ruined something.
I have done some research and it looks like it is an STC 520B from 1938, made in Alexandria, NSW (totally by coindcisence, the old STC building that it was made in is just a few blocks from where I live).
I am 99.9% certain that is the correct model, but I have not been able to find any other images of this model, except for one on a site which didn't have a description to confirm model it was. The sticker on the back says 520I, but I can't find any reference to that model, and the 520B description fits.
The case is a bit scratched up in places, a couple of the valves have gone, and I am certainly not plugging it in to test it, as power cord is so old that it is mostly bare metal wire. So it is safe to say that it has seen better days. One idea I had if the internals are no good was to restorenthe case and put a Bluetooth speaker system inside so it can still have a home on the shelf and have a use.
If anyone knows anything about this radio or has any advice then it would be greatly appreciated.
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Location: Sydney, NSW
Member since 28 January 2011
Member #: 823
Postcount: 6763
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I am certainly not plugging it in to test it, as power cord is so old that it is mostly bare metal wire
Very wise indeed! In fact cut that cord off and toss it. If the radio is to be restored then it will require a new cord and plug at the very least.
We await some photos, but in the meantime let us know the valve line-up if you can (there may be a valve position diagram on the chassis or inside the case?)
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Location: Sydney, NSW
Member since 28 July 2017
Member #: 2144
Postcount: 12
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Location: Sydney, NSW
Member since 28 January 2011
Member #: 823
Postcount: 6763
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Location: Latham, ACT
Member since 21 February 2015
Member #: 1705
Postcount: 2175
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Please consider having this restored. It can be done and there are people in this page that can help. You can at a later stage add a CD player which is very easy.
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Location: Sydney, NSW
Member since 28 July 2017
Member #: 2144
Postcount: 12
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It is hard to see from that photo and I am looking at it from my phone.
The cabinet looks very much the same, but it looks like the speaker hole is square on that one, but mine is round.
I found a photo that looks just like it on this page, but no description for the image.
http://www.hrsa.asn.au/h_link.htm
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Location: Sydney, NSW
Member since 28 July 2017
Member #: 2144
Postcount: 12
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And yes, it is the plug on the left. Thank you for mentioning it. Is it the length of the pins that makes it unsafe for modern sockets?
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Location: Sydney, NSW
Member since 28 January 2011
Member #: 823
Postcount: 6763
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The photo you linked to is your avatar image.
That's a nice looking set, but it's not the 520B as shown in the 1938 STC advertisement.
And, as above, it's quite likely to be restorable, especially if it's complete and hasn't been seriously hacked about with during its life.
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Location: Sydney, NSW
Member since 28 July 2017
Member #: 2144
Postcount: 12
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On the back is a sticker that says "CODE 520-I.N° " and then it is stamped with 1127. I thought the 520I was the model number, but I haven't been able to find a reference to that model.
I have included an image of the sticker with my uploads so you will hopefully see it soon.
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Location: Sydney, NSW
Member since 28 January 2011
Member #: 823
Postcount: 6763
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Is it the length of the pins that makes it unsafe for modern sockets?
No, it's the fact that the wire connections are not enclosed. These are known as 'suicide plugs'.
Another problem with them is that they crack easily, especially around the sides, making the even more unsafe.
They were often used with twin core (figure 8) cable, which is also no longer approved for 240 volts.
Restoration today would use a modern but antique style cable and plug like this:
https://cdn.shopify.com/s/files/1/0201/8228/products/brown_braided_textile_cord_for_Pendant_Light_Cord_with_Wall_Plug.jpg?v=1484007149
... and the set would be earthed (unless a transformerless 'hot chassis' set -- very dangerous).
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Location: Melbourne, VIC
Member since 20 September 2011
Member #: 1009
Postcount: 1211
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Ok, that makes more sense.
520 is the chassis type & the letters indicates the cabinet style. The other numbers would be serial no's.
Companies like STC would make a standard chassis that would fit in to various cabinet styles.
You will have no trouble finding a schematic for this radio - it is worth restoring.
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Location: Sydney, NSW
Member since 28 January 2011
Member #: 823
Postcount: 6763
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Yes, from what I read in ads of that period, STC models ending in A were horizontal style mantels and B were the upright style mantels.
Haven't come across L in that regard, but there are some STC aficionados on here who may be able to shine more light on that.
You can download the schematic here: http://www.radiomuseum.org/r/stcaus_520a_ch_520.html
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Administrator
Location: Naremburn, NSW
Member since 15 November 2005
Member #: 1
Postcount: 7402
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Photos are uploaded.
‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
A valve a day keeps the transistor away...
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Location: Sydney, NSW
Member since 28 July 2017
Member #: 2144
Postcount: 12
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Thanks Brad. That a picture speaks a thousand words, so they should help my terrible descriptions
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Location: Melbourne, VIC
Member since 20 September 2011
Member #: 1009
Postcount: 1211
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Thanks for the photos.
Now we know this is a model 520-1N. The "1" could be there to distinguish this model from an earlier battery STC radio with a 520 designation.. The "N" of course is the cabinet style.
The schematic shows it as STC Code 520-1.
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