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The VI103 'magic eye' tuning indicator is housed in a classic shaped envelope with the electrodes held in a glass pinch. The leads from the pinch are connected to pins in the International Octal base. The inset picture shows the circular display and the target at the centre. The triode section is clearly visible in the main picture and requires a grid voltage change of 22 volts for maximum visual change. The display is green.

This is a second generation indicator with a 6.3 volt heater. This type of indicator was used in many radios including the R1155.

The CV1103 was the Common Valve name for the existing NR69 and VI103.

The classic envelope is 40 mm in diameter and, excluding the IO base pins, is 93 mm tall.

References: Data-sheet, ³⁰⁰², ¹⁰⁴³ & ¹⁰⁴⁰. Type VI103 was first introduced in 1937. See also 1937 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.