The BF862 (obsolete) from NXP is very similar to the 2SK932.? I successfully used it in my Wellbrook built.
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The LT-Spice model:
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.model BF862-13 NJF(Beta=47.800E-3 Betatce=-.5 Rd=.8 Rs=7.5000 Lambda=37.300E-3 Vto=-.57093Vtotc=-2.0000E-3 Is=424.60E-12 Isr=2.995p N=1 Nr=2 Xti=3 Alpha=-1.0000E-3 Vk=59.97 Cgd=7.4002E-12 M=.6015 Pb=.5 Fc=.5 Cgs=8.2890E-1 Kf=87.5E-18 Af=1 mfg=NXP)
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regards
Fred