|[AMRadio] Subj change - HB designs|
brett.gazdzinski at verizonbusiness.com
Tue Jul 24 20:45:58 EDT 2007
>From a size standpoint, the 4-65 is not a great choice.
Running 2000 volts on the plates, you need a plate tuning cap
with about 5000 volt spacing to prevent arc overs on peaks.
Running 1000 volts you need say 2500 volts.
The RF output parts in say a DX100 are quite small.
Just the 5000 volt plate tuning cap (say 120pf) will
be the same size as the entire RF output section of the DX100.
> Jim Wilhite wrote:
> > You are right Tony. Why do 3 or 4 of them requiring a lot
> of filament
> > current when one could use one 4-250 or 4-400 or even two 4-125s.
> > One 4-65 will only give 100 watts out in ideal circumstances if run
> > full bore. Might as well have a DX 100.
> That's kind of the plan, Jim. I want to build a table-top
> using a single 4-65, modulated by a pair, in AB1.
> I have a modulation transformer with a screen winding on it. I could
> use a common supply, running around 2kV from a BC-610 plate
> and a pair of 866's.
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