▼ Menu

    
Extras ▼

The 2h-20 is a barretter or current regulator. The regulated current is for series connected heaters to compensate for voltage fluctuations.

The coiled iron wire will be in a hydrogen atmosphere.

The Amperite name on the dome.

The International Octal base.

Original box giving the date as 1955.

Thanks to Mark Mallison for sending the images.

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

Reference: Data-sheet.

Pin Connections

Absolute Maximum Operating Conditions^¶

PDF scanned from an original document held by the museum