Can anyone assist, please, with British source of UK240V - 12vA/C-A/C power supply with 2amp output?
Google searches only indicate sources with 1amp output max.
Needed for a Churchill make electric massage chair. Churchill refuse to assist with spares. The chair is fitted with massage units made by Raffel Product Development Co Inc in USA and the low voltage supply line carries a label stating "Use transformer #57-12-2000D only". This unit is believed to be made by a US company called CET, but is only available in in USA configuration.
If this is AC, then all that is needed is a transformer, not a 'power supply' as such. This will be reasonably bulky (since the transformer size will be fixed by the need to deliver 24W minimum, and the transformer will be operating at 50Hz). In general there has been a move 'away' from plug in supplies using this type of design, since switch mode AC/DC converters allow higher powers to be packed into smaller spaces. Plain (unboxed) transformers that are probably suitable, will be available from any electronics supplier (Maplin, Quasar, RS etc.). You might also be able to use one of the 'low voltage lighting' supply transformers, since the ones for halogen lamps, are normally 12v AC out. However there is a big 'caveat', that any transformer will produce more than it's rated voltage when operating under a light load, with the change being larger for small transformers. Without a proper specification, you have no way of knowing if a unit that produces (say) 17V unloaded, will be OK. Generally higher power units will droop less than small units in this regard, and in the case of lighting transformers, the coils are designed to keep this to a minimum. The Block HLV50, which is available from most electrical wholesalers, is rated to give 12.4v no load, and 11.5v at 4A, and with the addition of a 2A fuse for safety, might well be a good bet. The same company, also do a range of 'safety isolating transformers', with the SIM60, giving two 12v (nominal) outputs, each rated at 2.5A (12.9% regulation).
240V to 110v step down adapters are readily available, and cheap, so using the proper US transformer, combined with one of these, might well be the safer bet.
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