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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only.

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Old 19th Jul 2021, 11:58 am   #1
nightowl
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Default Lotus SG4 portable

We've just inherited one of the above, there's a few edges of the box covering that's perished over time (it's been in a garage for donkeys....). thought people might want to have a looksy.
If I ever got anyone to get it working again, are there modern versions of the batteries they use to use about?
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Old 19th Jul 2021, 1:12 pm   #2
Cobaltblue
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Default Re: Lotus SG4 portable

Nice set.

Yes the 2V lead acid accumulator can be replaced by a Cyclon or similar.

https://batterygroup.co.uk/Batteries...battery-E-cell

The HT battery can be made up by series connecting a load of PP3's (you will probably need 15 or 16 assuming the HT is 120V and use a lower tap as necessary for the detector.

And the Grid Bias Battery can be made up from 6 series connected AAA batteries as you will need to select a suitable tap.

Make them up into suitable scanned cases and they will look the business

Cheers

Mike T
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Old 19th Jul 2021, 8:44 pm   #3
nightowl
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Default Re: Lotus SG4 portable

thanks for that mike, I looked the lotus up last night, the battery looks like 1 big pin board like the telephone exchange women use to work, so that's 3 batteries inside the 1 case ?
attached some photos of the working parts of the old girl......
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Old 19th Jul 2021, 9:25 pm   #4
Cobaltblue
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Default Re: Lotus SG4 portable

I guess your looking at this picture you can see 3 Batteries

The Big one is the HT (in Red) these often had multiple taps making them suitable for many different sets and valve types.

The Blue one is the Grid Bias it looks as if this has two taps in use.

Lastly the green is the LT accumulator usually a Gel type in portable sets.

Cheers

Mike T
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Old 19th Jul 2021, 9:45 pm   #5
nightowl
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Default Re: Lotus SG4 portable

aye that's the one(or 3)...... were Lotus top middle or bottom of the range equipment back in the day? When I first saw the case I thought it was going to be a gramaphone, but was quite surprised when it was opened.....
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Old 22nd Jul 2021, 11:12 am   #6
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Default Re: Lotus SG4 portable

Before you go any further, you need to check the continuity of the inter-valve transformer and speaker coil as these often fail in suitcase portables due to the battery fumes rotting the copper wire. For a price they can be rewound but it's best to know up front what you are getting into.
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Old Yesterday, 11:11 am   #7
Gridiron
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Default Re: Lotus SG4 portable

The fixed resistors also may require checking and the blue painted Dubilier cap will probably be very leaky.
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Old Today, 6:55 am   #8
nightowl
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Default Re: Lotus SG4 portable

tar muchly, yeah I will get a person that is old technology savy to give it a look over as I am a novices novice when it comes to W/T stuffs......I've not even looked at the speaker innards tbh.....the latches would they have been some sort of chrome or just silver painted (the drawings of them they look light coloured) ?
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Old Today, 9:09 am   #9
Herald1360
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Default Re: Lotus SG4 portable

Possibly nickel plated given its age. Unlikely to be just painted at any rate.
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