>
>
>Jon Ogden wrote:
>
>> Jim,
>>
>> Wouldn't an easy estimate of average dissipation just be the peak
>> dissipation multiplied by the duty cycle?
>>
>
>### That may actually work. Gee, with ssb, we should be getting tons of
>power out. What I'm trying to figure out is this. With a given continuous
>plate diss rating,how does one figure out max power rating to a tube,so as
>not to exceed that rating.
? For voice-SSB. the limiting factor is usually peak cathode emission.
As a general rule of thumb, max. PEP out is about double the diss.
rating. For example, with plenty of anode V, a 3-500Z produces about
1000w PEP.
>
>- I'm trying to figure how hard I can push the 3000A7, with it's 4kw anode
>diss.
? Figure about 8a of peak cathode emission. This will produce 7k - 8k
out.
>The high idling current really brings up average diss.
? Only for turkeys who sit there with the hammer down. . High speed
switching reduces the idle current to zero within mS after operator stops
talking.
> The idling
>power throws a wrench ito your simplistic peak diss x duty cycle theory.
>
? Not for those who do not use Lock to Talk.
>........
- Rich..., 805.386.3734, www.vcnet.com/measures.
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