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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Ralin tubes? posted by Joe Backer on October 19, 2021 at 15:57:28:
Just a side note, the 6X4 has a common failure mode where the cathode shorts to the heater. This isn't noted in any of the data sheets I've seen, but it's become a well-known phenomenon over the years. Somehow, Akai must have known about this in the early days, because the power supplies in the old Terecorders and M8s use a separate, floating winding for the 6X4 filament. That's the only way to circumvent the risk. As far as I know, the 6X5 (functional equivalent of the 6X4, but in an octal) does not suffer from this.
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