Re: Mullard Valve Tester Card Project
Mine is an E7600/4 model with horizontal buttons and having recently spent hours checking tolerance and replacing parts I now know it is an exact match to the Operating Manual Issue 4 (1958). It came with a test card index dated January 1966. Perhaps 5% of the 720 cards that came with it have the 'series' letters A or B under the Mullard logo.
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