Those work very well. I use them in my Williamson amps. But I would strongly caution against replacing a KT88 with an 807, unless your circuit is adjusted for much lower plate voltage and current limits. Even replacing a 6L6GC could be more than an 807 can handle. They are rated for 400Vp max and 25 watts of plate dissipation. Some of the multi-tube SE amps, like Dennis Had's Inspire, can take advantage of the sub. My friend Jim used 807s in his Inspire with very nice results. The 807 is about as close as you can get to a 300B in sound, without the hassles or expense.
. It's definitely a more "vintage" sound, warm and a bit rolled-off on top, very pretty if that's what you want.
ETA: To be more clear, if the KT88 amp you ordered is triode-connected, be sure to follow the 400VDC plate maximum. If it's an "ultralinear" design I would still observe that limit. If it's a true "pentode" design with a separate screen supply then you can go higher, up to 600Vp, with a screen voltage limit of 300VDC. But I wouldn't push these very hard. My point is that these are in now way a direct substitute for a KT88.
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