On 1/31/13 8:30 AM, John Rehwinkel wrote:
The drawback is that adding silicon was what caused the "sleeping sickness" in tubes held in cutoff for long periods, so the computer grade tubes cost more to make, as they were made without the silicon. However, money could be saved by using old punches, winders, and so forth, as linearity was not an issue (this is why computer grade tubes are generally not a good bet for audio or other analog/linear use).
The funny thing is that here are some audio files who think that the computer tubes are *better* for audio use, so they have driven up the price of IBM 6211s.
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