>
>> >- During the entire time that the Plywood Box was in service, it
>> >consumed less than 1 box of 5 fuses. Rated screen dissipation was 275w
>> > The fast blow fuse opened at roughly 200w.
>> >
>> Yes, I see...
>>
>> 73 from Ian G3SEK
>
>Not according to the Littlefuse catalog.
>
? (the Littlefuse catalogue apparently discusses fusing of tetrodes with
handles)
>It shows the fatigue life of fuses, time before opening under various
>loads, and so on.
>
The screen fuse was selected so that it would open when the screen
current exceeded the normal amount.
>It is impossible to find a fuse that reliably holds at under 200 watts
>of load, and opens within a minute at 275 watts of load.. especially
>higher amperage fuses like a transformer primary would require.
>
Is this getting good or what?
>Now you might get a fuse that is rated to safely carry 25
>watts of load
Fuses are rated in amperes, not watts.
>that opens in a reasonable time when the load is 250
>watts or more.
>
>Fuses mainly prevent drastic melt-downs.
[chortle]
>Electronic circuits are
>much more reliable
Transistors that C/E short offer zero protection.
> and hundreds of times faster in most
>applications.
Screen potential was 1200 - 1500 V. Duhhh.
end
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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