Hello Paul

These are what I used, cheaper from Bulgaria, or Russia:

https://www.ebay.co.uk/itm/Silver-Mica-Capacitor-Glass-Silvered-Mica-Military-Cap-Various-Values/120797139825?hash=item1c20121371:m:mwvrEzj9o01auqb5AmhytPg

Tuesday, April 10, 2018, 2:37:37 AM, you wrote:

> The core is 78 material.

> I tried again with different wire. The winding is somewhat tighter
> on the core but definitely not what I was hoping for. Clearly I am
> not bringing required skills to the table on constructing this.

> Drain waveforms became somewhat asymmetrical with one phase having a
> somewhat different shape from the other but peak voltage was
> similar... 65V on one side, 63V on the other with 13VDC supply.

> I'm sure this was a bad idea but out of curiosity I tried adding
> another 500 pf in parallel with the 1500 pf snubber cap on one side
> only. Power output and efficiency did not change but peak voltage on
> that side dropped a couple of volts. I then increased that side to a
> total of 3000 pf. Power output and efficiency has still not changed
> at all but peak voltage on that side is down to 50V and it stops
> ringing significantly sooner than the other side. Does this suggest
> anything other than insanity of the builder?

> Paul






-- 
Best regards,
 Chris                            mailto:[email protected]