The Baxandall parallel class-D oscillator "squegs" in real life if you build it with a high value inductance in the current feed and bipolar switches. An LTSpice circuit using the Gummel-Poon model for the bipolar transistors doesn't show this - it settles down to a stable sinusoidal oscillation within less than a hundred cycles.
The obvious effect of using a high value inductor is that the current through the inductor over-shoots dramatically at start-up and actually reverses polarity as it recovers, so the bipolar transistors briefly run inverted (emitter and collector diffusions swap roles). In real life this clearly makes the circuit behave very oddly, but the Gummel- Poon model equally clearly doesn't capture this particular oddness.
VBIC might do better, but it doesn't with the model parameters that I bodged out of Gummel-Poon parameters. Somebody who had a better - some - understanding of the VBIC parameters might well be able to do better.
Version 4 SHEET 1 3272 1144 WIRE -160 -160 -464 -160 WIRE 80 -160 -160 -160 WIRE 368 -160 80 -160 WIRE 80 -128 80 -160 WIRE -160 -64 -160 -160 WIRE 368 -64 368 -160 WIRE -64 -16 -96 -16 WIRE 80 -16 80 -48 WIRE 80 -16 16 -16 WIRE 112 -16 80 -16 WIRE 176 -16 112 -16 WIRE 304 -16 256 -16 WIRE -160 96 -160 32 WIRE -80 96 -160 96 WIRE 0 96 -80 96 WIRE 288 96 64 96 WIRE 368 96 368 32 WIRE 368 96 288 96 WIRE -160 192 -160 96 WIRE -112 192 -160 192 WIRE 80 192 -32 192 WIRE 208 192 80 192 WIRE 368 192 368 96 WIRE 368 192 288 192 WIRE -224 272 -288 272 WIRE 16 272 -144 272 WIRE 80 272 80 192 WIRE 80 272 16 272 WIRE -464 336 -464 -160 WIRE -128 416 -160 416 WIRE -32 416 -128 416 WIRE 192 416 48 416 WIRE 224 416 192 416 WIRE 384 416 304 416 WIRE 400 416 384 416 WIRE 112 464 112 -16 WIRE -160 560 -160 416 WIRE -48 560 -160 560 WIRE 400 560 400 416 WIRE 400 560 32 560 WIRE -464 624 -464 416 WIRE -288 624 -288 272 WIRE -288 624 -464 624 WIRE 112 624 112 544 WIRE 112 624 -288 624 WIRE 192 624 192 416 WIRE 192 624 112 624 WIRE -464 656 -464 624 FLAG -464 656 0 FLAG 16 272 Vct FLAG 384 416 Vout+ FLAG -128 416 Vout- FLAG -80 96 tank- FLAG 288 96 tank+ SYMBOL ind2 -128 208 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 4 56 VBottom 2 SYMATTR InstName L1 SYMATTR Value 250=B5 SYMATTR Type ind SYMATTR SpiceLine Rser=3D0.022 Cpar=3D1p SYMBOL ind2 192 208 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 4 56 VBottom 2 SYMATTR InstName L2 SYMATTR Value 250=B5 SYMATTR Type ind SYMATTR SpiceLine Rser=3D0.022 Cpar=3D1p SYMBOL cap 64 80 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 46 32 VTop 2 SYMATTR InstName C1 SYMATTR Value 100n SYMBOL ind2 -240 288 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L7 SYMATTR Value 33m SYMATTR SpiceLine Ipk=3D0.03 Rser=3D80 Cpar=3D8.5p SYMATTR Type ind SYMBOL voltage -464 320 R0 WINDOW 123 0 0 Left 2 WINDOW 39 24 132 Left 2 SYMATTR SpiceLine Rser=3D0.001 SYMATTR InstName V1 SYMATTR Value 5 SYMBOL ind2 32 0 M270 WINDOW 0 44 45 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L3 SYMATTR Value 1.4=B5 SYMATTR Type ind SYMATTR SpiceLine Rser=3D0.001 Cpar=3D1pF SYMBOL ind2 272 0 M270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L4 SYMATTR Value 1.4=B5 SYMATTR Type ind SYMATTR SpiceLine Rser=3D0.001 Cpar=3D1p SYMBOL res 96 448 R0 SYMATTR InstName R1 SYMATTR Value 3k9 SYMBOL pnp -96 32 R180 SYMATTR InstName Q3 SYMATTR Value 2N3906A SYMBOL pnp 304 32 M180 SYMATTR InstName Q4 SYMATTR Value 2N3906A SYMBOL ind2 -48 432 R270 WINDOW 0 44 45 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L5 SYMATTR Value 22.5=B5 SYMATTR Type ind SYMATTR SpiceLine Rser=3D0.004 Cpar=3D1pF SYMBOL ind2 208 432 R270 WINDOW 0 44 45 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L6 SYMATTR Value 22.5=B5 SYMATTR Type ind SYMATTR SpiceLine Rser=3D0.004 Cpar=3D1pF SYMBOL res 48 544 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R2 SYMATTR Value 1k SYMBOL res 64 -144 R0 SYMATTR InstName R3 SYMATTR Value 1k TEXT -488 720 Left 2 !.tran 0 10m 0m 10n TEXT -488 760 Left 2 !.ic V(tank-)=3D5 V(Vct)=3D4.995 V(tank+)=3D4.99 V(Vo= ut
+)=3D0.0 V(Vout-)=3D-0.0 I(L3)=3D0.00 I(L1)=3D0 I(L2)=3D0 I(L4)=3D-0.0 I(L5)=3D-0.0 I(L7)=3D-0.0033 TEXT -480 800 Left 2 !K1 L1 L2 L3 L4 L5 L6 0.99 TEXT -488 840 Left 2 !.model 2N3906A PNP(ibei=3D2.22716E-18 xii=3D3 Ea=3D1.11 Vef=3D16.8 \n+ Iben=3D7.558f Nen=3D1.536 Ikf=3D.293583 Xin=3D1.= 5 Ver=3D50 ibcn=3D529.3E-18 \n+ Ncn=3D15.51 Ikr=3D10. Rcx=3D.8508 Cjc=3D10.1= 3p Mc=3D. 6993 pc=3D1.006 Fc=3D.5 \n+ Cje=3D10.39p Me=3D.6931 pe=3D.9937 Tr=3D10n Tf= =3D181.2p Itf=3D4.881m rth=3D0. cth=3D0.\n+ Xtf=3D.7939 Vtf=3D10 Rbx=3D10)\n+ Level= =3D9-- Bill Sloman, Nijmegen