raypsi wrote:

snip
I agree it's not a flyback.

I don't think it's resonant converter because you looky at VK3HZ's
data on loading it, the duty cycle would take it way out of resonant.


Thanks to jimmie for the PDF service manual; inspection of the
schematics shows differences between the block diagram (which
seems to show a resonant configuration) and the inverter detail
schematic (which shows a voltage doubler configuration). There
are also mistakes in wiring runs (circuit box outlines confused
as wires and having cross-connect dots misplaced, etc.). After
accounting for these, the above assumptions seem correct.

A quick web search for inverter microwave ovens seems to yield
only Panasonic models, and the cheapest in my area is $158.00
at Walmart. To me, this isn't really cost-effective, and they
are too new to be found in the alley. I intend to continue
to explore utilizing PC PSU parts to build an HV supply.

Michael