In case anyone is interested (and I know most people aren't but at least it's on topic) this circuit has the following features.

1. Almost constant output level from startup. It does take time to fully stabilize (about 40 seconds) but during that time the peak
output level only changes by 60mV.

2. An FFT on the last 6 seconds with Blackman-Harris window shows 2kHz at -153 dB

Performance can probably be improved further with fine adjustment of some component values.
Any suggestions for further improvement (whether for lower cost or better performance) are welcome.

JM mentioned some time ago that adding buffers for the rectifier phases would improve performance. He wasn't wrong but the ones used
here may be overkill. If you know of a cheaper buffer which will do the same job please let me know.

It won't be cheap to build, if it's ever built. I'd expect test equipment to cost a lot more, assuming equipment exists which can
measure at 153 dB down.

LTSpice 24.1.8 with all component updates (9th May 2025) was used for this simulation.

This circuit only exists in an LTSpice simulation. Reality may be different.

If you want to simulate the full 60 seconds then you probably want to run it overnight.

My next move will be to move this circuit to QSpice. I'll have to use generic op amps but it will be interesting to get familiar
with QSpice. Does anyone know of any suitable op amp and/or buffer models I can import into QSpice?

Version 4.1
SHEET 1 3020 2548
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WINDOW 0 -6 -6 Left 2
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SYMATTR InstName Q1A
SYMATTR Value NSS40301MDR2G
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SYMATTR Value NSS40301MDR2G
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WINDOW 3 99 -31 VRight 2
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WINDOW 3 24 8 Left 2
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SYMBOL cap 112 544 R180
WINDOW 0 24 56 Left 2
WINDOW 3 24 8 Left 2
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WINDOW 3 40 37 Left 2
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SYMBOL diode -128 688 M0
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WINDOW 3 43 34 Left 2
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SYMATTR InstName R27
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WINDOW 3 -33 1 VTop 2
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WINDOW 3 0 56 VBottom 2
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WINDOW 3 32 32 VTop 2
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WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
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SYMATTR InstName R40
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SYMATTR InstName R41
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WINDOW 3 32 56 VTop 2
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WINDOW 3 32 56 VTop 2
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WINDOW 3 32 32 VTop 2
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WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
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WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
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WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
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TEXT -1976 -112 Left 2 !.tran 0 60 0 1u startup
TEXT -1976 -168 Left 2 !.options plotwinsize=0 numdgt=15
TEXT -1480 -176 Left 2 ;Low distortion 1KHz oscillator. 9th May 2025.\nBased on designs and ideas by JM, BS, ER.\n153 dB down at
2kHz in LTSpice 24.1.8 simulation.
TEXT -1280 888 Left 2 !.MODEL NSS40301MDR2G NPN\n+is=6.87023e-12 bf=445.496 nf=1.08926 vaf=60.529\n+ikf=7.23313 ise=2.38192e-09 ne=4
br=23.6872\n+nr=1.10701 var=8.89608 ikr=1.25064 isc=1e-16 \n+nc=1.13174 rb=905.334,irb=2.30349e-07 rbm=1e-10\n+re=0.00600548
rc=0.0300274 xtb=1.2219 xti=4,\n+eg=1.05 cje=3.80477e-10 vje=0.912237 mje=0.397194,\n+tf=5.90916e-10,xtf=0.0998483,vtf=7.09172,itf=0.010481,\n+cjc=8.35472e-11 vjc=0.702862 mjc=0.43477
xcjc=0.899998\n+fc=0.414631 cjs=0 vjs=0.75 mjs=0.5 \n+tr=5.64658e-08 ptf=0,kf=0 af=1

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* Origin: fsxNet Usenet Gateway (21:1/5)