18th May 2018, 12:10 pm
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#3
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Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Marconiphone Type 41
Possibly similar in theory to these? (scroll down to auto series variometer):
http://www.valve-radio.co.uk/literat...ers-catalogue/
Lawrence.
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