Edotek has considerable experience with radio, audio amplifiers and technical instruments using valves. We also have an AVO VCM163 valve tester, this model being the last of the series of valve testers produced over several years by AVO, and is described my some as the ‘Rolls Royce’ of valve testers. These instruments are now >40 years old, and depending on ho well they have been treated during their early life, tend to need some maintenance to keep them operational. One of the most common problems is deterioration in the response of the (moving coil) meters which provide the measurements taken on valves; the coils of the meters often showing a lower resistance than expected and indicating lower current passing through them than is the true value.
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