hi again,
dave wrote...
>The 3CPX800A7 looks to me as if it could be dropped in
> place of the 3CX800A7 without difficulties. Same filament voltage,
> slightly higher anode voltage, and, interestingly, slightly lower
> interelectrode capacitance and slightly higher maximum frequency without
> derating. Odd thing, though - when you look at the two physically, the
> pulse-rated tube actually has a shorter insulator between anode and
> grid, despite the higher anode voltage rating. I know several hams
> who've gotten the pulse-rated '800 and put it in amps designed for the
> straight 3CX800A7 and changed not a thing.
>
> The '5000 is altogether different. The 3CPX5000A7 is actually a
> 3CX15,000B7 with a smaller anode. If you compare specs on the 3CX
> versus 3CPX version, you'll see that the "P" version requires higher
> filament voltage and current, and the grid is massive in comparison (50
> watts dissipation, if I recall). So in that case, even though they're
> physically identical, you cannot drop one in place of the other.
so there you have it! whether it's the same or not depends on the
tube type!
thanks dave!
73,
George T. Daughters, K6GT
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