Unusual PSU

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Lardo Boffin
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Unusual PSU

Post by Lardo Boffin »

Along with the early bugged ROM zeddy I just bought I got the PSU below.

A1B89545-D223-4863-A5D3-694CD6615250.jpeg

On all the ones I have seem so far it either says UK700 or UK1200. I don’t remember seeing one with just the ratings on it like this. Anyone else seen one?
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RetroTechie
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Re: Unusual PSU

Post by RetroTechie »

I've seen several marked "EURO 1400" as well. Not sure if other values like 1200 or 700 were also used in combination with that. Iirc some of those supplies had the same transformer inside, just different value capacitors (to 'upgrade' a "1200" to "1400" or similar). And/or same as some Spectrum psu's, but using a different DC plug. (and polarity! :shock: )

Could be related to the plug. With shown psu produced before Sinclair became involved with a variety of export markets. What's on the end of the AC cord?
Lardo Boffin
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Re: Unusual PSU

Post by Lardo Boffin »

RetroTechie wrote: Wed Jun 19, 2019 5:04 am
Could be related to the plug. With shown psu produced before Sinclair became involved with a variety of export markets. What's on the end of the AC cord?
Unfortunately it came without a plug. Being before the exporting of computers makes sense - there would be no need to mark it as UK.
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ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
TS 1000 iss 3, ZXPand AY and +, ZX8-CCB, ZX-KDLX & ChromaSCART
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TS 1500 & 2000
Spectrum 16k (iss 1 s/n 862)
Spectrum 48ks plus a DIVMMC future and SPECTRA
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1024MAK
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Re: Unusual PSU

Post by 1024MAK »

Keep in mind that Sinclair contracted out the supply of power supply units to more than four companies.

The label that was fitted, varied depending on which company made the PSU and which market (country) it was intended to sell it in.

The ZX81 “700” and the “1200” appear to use the same size transformer, but the “1200” normally has either a bigger capacitor (or two capacitors wired in parallel).

The ZX Spectrum “1400” does have a bigger transformer in it.

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Moggy
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Re: Unusual PSU

Post by Moggy »

One of my power supplies was made in Lincolnshire. The board has place of origin on it as part of the design but sadly not the maker. :(
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