How much energy can be pulled from a C-core transformer ?

[walker1]

I have a C-core transformer salvaged from some audio equipment.

Primary and secondary windings are both placed evenly on each side of the core, which has cross section area of
6.4 sqr.cm (3.2 x 2 cm)

By using the rough estimate that can be used for E-I cores,
that should enable me to draw approx. 6.4*6.4 = 41 VA from the transformer.

But how about a C-core ?
I have heard you can pull more out of such a thing due to a shorter magnetic traveling distance (or something), but I havn't found any specifics or 'rule of thumb' on the web yet.

 

[Warpspeed]

The maximum power you can get out of it will be determined by the allowable temperature rise in the windings.

As you place more load on it, it will become hotter, and that will limit the maximum load.

If you are designing a transformer from scratch there are many other factors to consider. For an existing design, temperature rise is all that need concern you.