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Grampian 506
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27th Aug 2019, 11:31 am
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Nuvistor
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Join Date: Aug 2013
Location: Wigan, Greater Manchester, UK.
Posts: 9,433
Re: Grampian 506
Is it an fully isolated transformer or an auto transformer? Other makes have used that system, the Pye R33 for one with a tap for the valve heaters.
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