Guest crankit Posted July 14, 2021 Posted July 14, 2021 The Bottlehead BeePre 2 300B preamp kit I ordered has a PT9 universal transformer (filament voltage regulated) The manual provides a few options for tranny input wiring for Aust nominal 230VAC 1: GREATER than 210V AC and LESS than 225V AC 2: GREATER than 225V AC and LESS than 235V AC 3: GREATER than 235V AC and LESS than 245V AC Given voltage fluctuations I am thinking of option 2 Have I answered my own question or would a better option ring truer? The BeePre 2 will drive my Elekit TU 8600S 300B power amp and have high hopes with combo Appreciate any advice
muon* Posted July 14, 2021 Posted July 14, 2021 (edited) Go the GREATER than 235V AC and LESS than 245V AC. Have you measured the voltage you get at the wall? WA is well know for voltages as high as 260v at times in some locations. Aussie voltage on paper is 230v but in reality it is often 240 and higher, only rarely is it 230v for anyone. Edited July 14, 2021 by muon* 1
RoHo Posted July 14, 2021 Posted July 14, 2021 Agree totally with Muon. Every time I have used a 230V transformer for my DIY tube builds the heater voltages are high ie 6.6-7.0 V rather than the specified 6.3V. Every time! 1
Guest crankit Posted July 15, 2021 Posted July 15, 2021 13 hours ago, muon* said: Go the GREATER than 235V AC and LESS than 245V AC. Have you measured the voltage you get at the wall? WA is well know for voltages as high as 260v at times in some locations. Aussie voltage on paper is 230v but in reality it is often 240 and higher, only rarely is it 230v for anyone. Noted, thanks muon Will be doing voltage measure when I have the PT9 on the bench as not shipped out of US yet 1 hour ago, RoHo said: Agree totally with Muon. Every time I have used a 230V transformer for my DIY tube builds the heater voltages are high ie 6.6-7.0 V rather than the specified 6.3V. Every time! Thanks RoHo, handy advice from a DIYer so will be wiring PT accordingly because Tube Lives Matter
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