smallest iron core high voltage transformer ?

[ElectroXa]

Hi everyone 

I recently made this tiny "high" (medium) voltage transformer, which outputs 690V rms at couples of mA, to feed small gas tubes and small multipliers

The transformer consumes 13mA when the secondary is open circuit, and 8mA when the secondary is shorted, with 0.1uF ballast capacitor in series with primary and isolated 230V in the primary.
When run for several minutes, the primary gets a very little warmer.



(the TO-247 mosfet is for size comparison, the core measures 5 cm height, and 3,5cm width)

the main  question is : Did you ever see an even smaller iron core (50-60Hz)  HV transformer, or did I make one of the smallest ? 

[MarcusFunt]

i have never seen smaller mains frequency transformers hv than yours, but the small ones in an electric bugzapper are sometimes made of iron