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The Y63 is the most probable designation of this 'magic eye' tuning indicator. The valve 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 Y63 was for mains sets and parallel heater connections. The operationally identical Y64 was for AC/DC sets and this suggests that the heater was controlled for both Voltage and current.

The 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. See CV51 for the nearly identical Y65. The Y65 had increased sensitivity requiring 11 volts change for full deflection range.

This is a second generation indicator with a 6.3 Volt heater. This type of indicator was used in many radios.

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 Y63 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.