Sharp cutoff. See also 6GJ7, 8GJ7. And of course Fred's paraphase circuit... http://www.dogstar.dantimax.dk/tubestuf/paraph.htm
Taking a look at Frank's website, http://www.mif.pg.gda.pl/homepages/frank/sheets/010/p/PCF801.pdf
the pentode curves look to be somewhat remote cutoff. Also at frank's, http://www.mif.pg.gda.pl/homepages/frank/sheets/124/p/PCF801.pdf it says that it's a remote cutoff pentode.
Unless you want to use it for guitar work, it's probably not usable for audio.
the pentode curves look to be somewhat remote cutoff. Also at frank's, http://www.mif.pg.gda.pl/homepages/frank/sheets/124/p/PCF801.pdf it says that it's a remote cutoff pentode.
Unless you want to use it for guitar work, it's probably not usable for audio.
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