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Dave, C6 and C8 are the C5 and C7 100uf capacitors in the Phillips UM10155 schematic.
Here is some comparison data I took for the two versions.
Input signal for both versions 2 volt peak to peak sine wave
Spice directive for both versions .tran 0 11m 100u uic

Your transistor version with C5 and C7 100uf capacitors installed in the circuit.
24 volt peak to peak output
Simulation time = 1008 seconds using normal solver and producing a 3 GB raw file.

Your transistor version with C5 and C7 100uf capacitors removed from the circuit
26 volt peak to peak output
Simulation time 956 seconds using normal solver and producing a 3 GB raw file

Raymond's transistor version with Robert Talty's modifications with C5 and C7 100uf capacitors removed from the circuit.
27 volt peak to peak output
Simulation time 317 seconds using normal solver and producing a 740 GB raw file.

Oh well, another interesting curiosity that will remain a mystery. time to move on.

Howard


Dave Allen wrote: