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Old 13th Dec 2018, 9:26 am   #1
David Roberts
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Default Unidentified Bridge Rectifiers?

These fell out of a large bag of vintage radio spares that I bought at a boot fair. They look like bridge rectifiers, but I am unable to find anything on the web that resembles them in appearance, or corresponds with the numbers printed on them.

I would like to give them some useful employment, but am rather stuck without a data sheet. Please let me know if you recognise this type and could give me any more info' about their use &c.

They measure 4 x 3 cm and are numbered N 8138, N 8228, A 8134, A 8234. One of them has 7/18/12/5 scratched on the metal support bracket.

Many thanks,

David
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Old 13th Dec 2018, 12:00 pm   #2
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Default Re: Unidentified Bridge Rectifiers?

From Google images: https://www.ebid.net/us/for-sale/bri...-170272140.htm
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Old 13th Dec 2018, 12:22 pm   #3
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Default Re: Unidentified Bridge Rectifiers?

I've also come across single diodes, dual diodes, SCRs and Triacs in that package... but not, so far, bipolar transistors. I think the package appeared in the early '70s and declined in the mid '80s

The first step is to start finding diode junctions, I guess. Finding they're bridges would be the easiest outcome.

David
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Old 13th Dec 2018, 12:27 pm   #4
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Default Re: Unidentified Bridge Rectifiers?

Somewhere I have a few of these and as David has said other things other than Rectifiers were in this package.

I suspect that the numbers are date codes.

Cheers

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Old 13th Dec 2018, 12:57 pm   #5
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Default Re: Unidentified Bridge Rectifiers?

I don't have the data sheets anymore, but they are bridge rectifiers.
Quite possibly they are the RS ones as per the Ebid link.

The numbers are the the date code, first two = year, second two = week

The tags are colour coded Green - AC, Red & Black DC + & -

You should do a meter check first to check they are still intact.

If anybody has an RS catalog from the 80's, it should have the data.
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Old 13th Dec 2018, 3:54 pm   #6
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Default Re: Unidentified Bridge Rectifiers?

The attached scan of a 1981 RS catalogue is probably what you require

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Old 13th Dec 2018, 5:08 pm   #7
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Default Re: Unidentified Bridge Rectifiers?

10 amp plus rectifiers, AEI and other ancient firms made them, RS used to stock them. They were often fitted to small generators for the exciter field. I have several some where and use one which is mounted on a large heat sink inside a box, I connect it to the output to my Variac to get high DC current when testing motors, works well.
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Old 13th Dec 2018, 5:51 pm   #8
David Roberts
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Default Re: Unidentified Bridge Rectifiers?

Thank you everyone! What an amazing response. The samples that I bought seem to have lost their RS labels so, it will probably prove impossible to identify which of the four versions they are. However, provided I stick to the lowest voltage/amperage combination they should be OK.

Yours in admiration,

David
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Old 13th Dec 2018, 6:02 pm   #9
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Default Re: Unidentified Bridge Rectifiers?

You might want to think about the (small) risk in using them against the very low cost of 1N5408 type rectifiers with known ratings.
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Old 13th Dec 2018, 6:05 pm   #10
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Default Re: Unidentified Bridge Rectifiers?

Just connect a DMM on 1000V range across each diode junction and megger it.
They will work like zena diodes and give you the absolute maximum voltage.
If you then de-rate that by 50% you should be close to the actual rating.
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Old 13th Dec 2018, 7:26 pm   #11
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Default Re: Unidentified Bridge Rectifiers?

I have or had one of these in a battery charger. I think it is still in it, nothing amiss with it as far as I can see.
Les.
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Old 13th Dec 2018, 8:03 pm   #12
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Default Re: Unidentified Bridge Rectifiers?

The ones shown in the first photo definitely remind me of the types we had in 1970s/1980s CAMAC-crate nuclear instrumentation power-supplies.

Yes, the rectifiiers were made by AEI, with Siemens as a second-source.

Typically you'd have a plug-in that took up 3 or 4 CAMAC-bays, incorporating a big toroidal transformer, a couple of those bridges fitted to the back-plate of the module, and some DALY screw-terminal-connected electrolytics.

Think +/-6V or +/- 12V at 15A or so.

[More info on CAMAC here: https://en.wikipedia.org/wiki/Comput...nt_and_Control ]
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