The connecting pins are placed around the periphery of the bulb and project radially outward: this maintains short internal leads with low inductance, an important property allowing operation at high frequency.

The pins fit a special socket fabricated as a ceramic ring in which the valve itself occupies the central space.

[2] The 954 and 956 types are sharp and remote cut-off pentodes, respectively, both also with indirect 6.3 V, 150 mA heaters.

The heater has a 6.3 volt rating, which it shares with many other common thermionic valves/electron tubes, and it draws about 150 mA.

The amplification factor obtained is between 20 and 25 depending on details of the specific stage design and operating voltage.