There is o significant difference worth mentioning. The filament voltage of the
3CPX1500A7 is
specified by Eimac to br 5.5 volts at 11.2 A while the 8877 is specified at
5.0 volts at 10.5 A.
If the amplifier filament transformer only produces 5 volts, it may reduce
the life span of the YC-257 since the filament will be 10% lower than specified.
Other than that, it is an outstanding tube.
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