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The 6DS4 Nuvistor from RCA is a triode for use at VHF as a grounded grid amplifier and it is built into a small metal case. The base is ceramic sealed to the metal case and five fine pins, on a 12 pin grid, form the connections and the electrode supports internally. The 6DS4 is a remote cut-off (vari-μ) version of the 6CW4 and the 2DS4 differs from the 6SD4 in having a 2 Volt heater.

As well as use at VHF in radio equipment the Nuvistor was used for wideband Y amplifiers in oscilloscopes and the the high gm value is required for wide band width use. The Nuvistor was employed in audio amplifiers although not designed for this purpose.

The Nuvistor is built as a series of co-axial electrodes but they are all very small, and small inter electrode capacitances result. Thus the high frequency of operation. Unlike the transistors of the time the Nuvistor had the overload and intermodulation characteristics of the valve, superior to the transistor.

The identification is stamped into the top of the envelope can.

The thin metal tube envelope is 9 mm in diameter, and excluding the base pins is 20 mm tall.

References: Data-sheet & ³⁰⁰². Type 6DS4 was first introduced in 1962. See also 1962 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.