BX3000

'Beam-X Switch' family from Burroughs. To reduce the size of the previous beam switch tubes, Burroughs moved the magnetic source inside the electrode structure; 10 small magnets were mounted into the tube, one for each counting position. The Beam-X family had no pin available for zero reset feature.
Glass envelope with 25 pin base, no magnetic shield. BX3000 is the proprietary code for EIA 6712 type.
Operating principle of trochotron.

In the early sixties the use of this counter was investigated in a study on a random noise generator. Probably the noise was of the same kind of the one defined as pink or pseudo-random, described years later, based upon a shift-register with an exclusive-OR in the feedback. Anyway the vague news of this application resulted in the widespread myth of a secret tube, so secret to lead to the destruction of its documents. Nothing further from the truth: the tube was registered as JEDEC 6712 and its datasheet is currently available thanks to the TCA.

		BX3000: Manufacturer's Literature Emilio Ciardiello Mas ...

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