[morzh]

You need a pushpull with impedance conversion Terry just listed from your voice coil impedance (I do not know what it is but if you, after removing the transformer (important!!!) measure across the voice coil of your speaker this will give you a fairly acceptable idea of it). A Hammond 125 pushpull is a good candidate.
http://www.hammondmfg.com/125a.htm

Check your impedance and go by the chart, does not have to be exact, just reasonably close.