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Burroughs BD-203 Series
Written by AnubisTTP on 2006-10-11

Description

Devices included in this entry:

Burroughs BD-203 unshielded MBST (pictured in thumbnail)
Burroughs BD-316 shielded MBST

The Burroughs BD-203 series includes the only known 'compact' models of beam switching tube, with a slender envelope and external magnet. The series consists of the unshielded (and extremely rare) BD-203, and the shielded BD-316. The BD-203 and BD-316 are capable of counting at 1MHz.

The short-lived BD-203 is noteworthy as being the direct predecessor to the internal-magnet BX-1000, with which it shares similar electrical and physical specifications.

Detail

Burroughs BD-203, the only unshielded external magnet MBST with a compact envelope. Note the slender envelope body which flares outward to accommodate the 26-pin base.


This BD-203 is an extremely early example, with no protective end caps and an improvised label originally intended for a different part number. Note the affixed part number label, which conceals the original 6700 or 6701 part number.


Burroughs BD-316 compact-envelope beam switching tube with mu shield.


Burroughs BD-316, minor print variation.


BD-316, 26-pin base.


Mounting bracket for BD-316.