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813 warm up time
On Tue, 1 Apr 2008, Rick wrote: How long after applying filament voltage till the 813 is ready to transmit? Is it like a 3-500 or do I have to wait 30 seconds or so? Rick K2XT When the glow is up to bright orange, then you are ready. If you apply the filament voltage without "management" (i.e. a slow increase over, say 5-10 seconds), the tube should be ready for transmit in, like, about 1-2 seconds. In a heater cathode (rather than a filament cathode), you need to wait for that thin "coat" to come up to a dull orange and that can be half a minute or so depending on the tube. |
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