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The tubes have very similar characteristics. Same focusing method. The only differences are physical characteristics (all wp4 is all glass, and 18-1/2" long instead of metal shell and 17-11/16" long), and higher anode voltage (16k vs 14k for the GP4), and of course the dual field ion trap (instead of the single bent-gun type for the GP4) If he can physically fit it in his application, he has nothing to worry about. Grid voltages and the like are identical.
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Jordan
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