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Old 9th Dec 2018, 6:04 am   #1
met9911
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Default Stella model ST1000U/15. (Actually an ST100U/15).

Hello to all, just new to this forum.

Please find enclosed some photos of my newly acquired radio. It is a Stella, made in Britain model ST1000U/15.

I'm located in Sydney Australia and I would like to know a little more info on this model. If any member knows this model I would appreciate any feedback and or history on it.

The radio powers up and has a very strong and healthy sound to it.

Many thanks.
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Old 9th Dec 2018, 10:55 am   #2
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Default Re: stella model st1000u/15

Stellas were variations on Philips models made for sale through independent dealers rather than the Philips dealer network.

I don't recognise it, not being a Philips expert, but it appears to be a pretty typical early 50s British AC/DC transformerless design. Be aware that one side of the mains will be directly connected to the chassis - this technique is rare in Australian designs so you may be unfamiliar with it.
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Old 9th Dec 2018, 11:14 am   #3
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Default Re: stella model st1000u/15

Stella ST100U/15.

Lawrence.
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Old 9th Dec 2018, 11:36 am   #4
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Default Re: Stella model ST1000U/15. (Actually an ST100U/15).

Service data available here:-

https://www.service-data.com/section.php/7671/1/st100u
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Old 9th Dec 2018, 11:37 am   #5
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Default Re: Stella model ST1000U/15. (Actually an ST100U/15).

https://www.radiomuseum.org/r/stella_st100ust_100.html

Apparently derived from the Philips BG290U/BX290U:

https://www.radiomuseum.org/r/philips_bg290u.html
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Old 9th Dec 2018, 11:41 am   #6
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Default Re: Stella model ST1000U/15. (Actually an ST100U/15).

I have found some information on a ST100Ubut not the /15 variant.
The Trader service sheet as the circuit etc and this was published in December 1951, the radio was introduced in 1951.
From http://www.thevalvepage.com/tvmanu/stella/stella.htm
Stella was a subsidiary of Philips, as noted by Paul, to be sold by wholesalers not the Philips dealer branches. Announced February 1951, first products May 1951. Company address on the valve page link.

Manufacturers data can be obtained for £1.99 from
https://www.service-data.com/product...64/7671/m15964
Not sure what the /15 differences are.
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Old 9th Dec 2018, 11:44 am   #7
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Default Re: Stella model ST1000U/15. (Actually an ST100U/15).

The fact it has UK station names on the dial suggests it was taken to Australia by someone emigrating from the UK, rather than being imported in bulk.
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Old 9th Dec 2018, 3:44 pm   #8
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Default Re: Stella model ST1000U/15. (Actually an ST100U/15).

/15 is the code for UK versions I think, so the data will be correct.
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Old 9th Dec 2018, 5:54 pm   #9
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Default Re: Stella model ST1000U/15. (Actually an ST100U/15).

I restored a Stella 105U of the same era some time ago and found that it had several pitch-encapsulated paper caps beneath the chassis on which some of the pitch had cracked and crumbled away. I replaced them as a matter of course, and when tested on an insulation tester at the working voltage, most were leaky. See pics 1 & 2 below.

One slight complication is that as with your 100U, it has a volume control with an extra tap. In my case, though the pot worked fine, the ganged wavechange switch didn't, but after dismantling and some jiggery pokery, it worked in the end.

I did wonder if a tapped pot could be simulated as shown in the last pic below.

The original pot of my ST105U is 500K in total, tapped at 50k (10%) from the 'hot' end, the same as your ST100U. I'd wondered if by using a 1 Meg pot in parallel with a potential divider consisting of a 100k and 90 k resistor in parallel with the junction as the tap might suffice as an alternative. It seemed to make sense to me, (still does actually), but not to sundry pundits.

Your set has the added advantage of Short Wave as well as Long and Medium.

The frame aerial works surprisingly well. (You set also has a plate aerial for SW).
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Old 12th Dec 2018, 12:33 am   #10
met9911
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Default Re: Stella model ST1000U/15. (Actually an ST100U/15).

Many thanks to all the members that provided me with good info.

I have been following this hobby of ours for a few years now and it's the very first time I have ever seen or heard of this model here in Australia. I had my suspicions at first glance it was a Philips off shoot, because our Philips model 135 over here bears an aesthetic resemblance complete with the wrap around cardboard type rear cover and yes, I think it was a one off, brought in from England.

Once again, thanks for your input.
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