From: "Tom Hix" <w4th@charter.net>
> Can someone tell me what makes a 3CPX800A7 is so much better than a plain
> 3cx800a7 tube?
The P version has the same external dimensions but taller ceramic structure
internally, so it can withstand higher anode voltage. Eimac recommends 2250 max
for the 3CX, and 3500 max for the 3CPX. For direct substitution in an amp
designed for the non-P version there probably isn't much advantage, but for new
designs or upgrades the P version allows higher anode voltage, which can give
better efficiency and require less drive power.
73,
Jim, KR1S
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