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Original manual weston model 686 vacuum tube analyzer
An original instructions (book) for a Weston Model 686 True Mutual Conductance Vacuum Tube Analyzer, from the Weston Electrical Instrument Corp. Newark 5, New Jersey USA. Company address shows the age (no date that I can find). Printed in USA.
35 pages, 2 blank in the back for Notes. Table of Contents above gives you an idea of areas covered. Lots of black/white photos, graphs and tube & data charts. There is also a single page addendum to 686-9B inside.
CONDITION: GOOD FOR THE AGE. A shadowed stain to the front cover, but overall looks great. No mildew and from a non-smoking household.
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