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Donation by Robert Coleman

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A collection of valves both donated and lent for photographing. Rob has also been proof reading and sending additional data. Rob's interests are: Music amplifiers (PA, bass guitar, guitar, organ), Industrial Laboratory Equipment (pH meters, spectrometers, chromatography amplifiers etc.), Amateur Radio, 'Hobby electronics' (Heathkit projects, 'Evil Genius' high voltage and laser type).
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