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Valve Gallery - Tuning Indicators (1)

Valves: AC/ME, ME41, TV4, EM34.

Shown above is a Mazda AC/ME tuning indicator. "ME" forms part of ident as also known as "Magic Eyes". The AC/ME was one of the earliest magic eyes in the UK, dating from about 1936 and only specified in receivers until 1937. One of only three to use a B7 base with 4v heater.

Shown above is a Mazda ME41. This is the tuning indicator that succeeded the AC/ME in the Mazda range. Uses Mazda octal base with 4v heater. Used from 1938 onwards. Height of 84mm.

Shown above is a Mullard TV4. This was the first tuning indicator offering from Mazda, dating from about 1936. Uses the P Type base (side contact). Now very rare and expensive in working condition. Uses 4v heater. Approx height of 73mm.

Shown above is a Mullard EM34. With International Octal (I.O.) base this had a 6.3v heater and was used during the 1940s and into the early 1950s. Red paint has been scraped badly at some point in the past, though some were produced unpainted anyway. 102mm height.

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