Sensibly equivalent¶ to:
6A8G CV578 CV3825
The X63 heptode mixer is typical of the 1930/1940s frequency changer. The triode oscillator is formed between the cathode and g2 acting as an anode, and has to generate a peak to peak voltage of 25 Volts. The mixer is screened by G3 and G5 with the signal injected into the oscillating electron stream at the top cap g4.
The envelope has the etched identification lozenge typical of an M-OV product. Our other X63 has a clear glass envelope.
The classic envelope is 36 mm in diameter and, excluding the IO base pins, is 98 mm tall.
References: Data-sheet, 1040 & 1043. Type X63 was first introduced in 1937. See also 1937 adverts.
Absolute Maximum Operating Conditions¶
Updated January 02, 2021.