>
>Rich AG6K wrote:
>> The idea that a tube with a fixed emissive limit can be
>> "upgraded" to provide an "advantage" by upping the anode
>> dissipation rating is hipe
>
>Do you think that when the manufacturer has upped anode dissipation,
>we could increase anode volts and get more Po for same Ia?
>
probably not. The 3-400z and the 3-500z have a 4000v rating.
>At least we can pray that grid/filament shorts are designed out
>of the new Svetlana tube!
>
The filament-grid shorting problem is primarily not due to a design
defect in the 3-400z and 3-500z, rather it is due to failure to
satisfactorily reduce vhf gain at the anode-resonance. On the other
hand, the incidence of filament-grid shorts could probably be reduced if
a means of supporting the midpoints of the filament helices was
incorporated in the design.
- later, Martin
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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