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SET Asylum Single Ended Triodes (SETs), the ultimate tube lovers dream. |
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SET Asylum Single Ended Triodes (SETs), the ultimate tube lovers dream. |
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In Reply to: VT52 posted by Jim Dowdy on June 3, 2014 at 09:47:32:
From the information in the link, I speculate that the higher (7v) filament rating was used specifically for transmitters because they are intermittent - the loss of lifetime is not a problem if you run it less than 60 seconds at a time. They may well have been identical to the more conservatively rated 6.3v filaments. The specifications are not really independent of the intended application.
FWIW, 7 volts is a standard voltage for three lead-acid cells under continuous charge, as they would be in an automobile, airplane, etc. The same cells used as storage batteries would give a standard 6.3 volts until they become discharged.
Filaments and heaters were often designed to accommodate a range of heater voltage for these reasons - dry cell and hearing aid tubes were especially subject to filament voltage abuse, and presumably tube manufacturers had the technology to deal with it.
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- RE: VT52 - Paul Joppa 20:42:32 06/03/14 (0)
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