Modem,
Thanks for confirming.
Shock,
I got hold of Altronics ( Australian components and bitsa distributor) PCB mounted transformer Altronics stock number M7058A
http://www.altronics.com.au/p/m7058a-powertran-5va-9+9v-pcb-transformer/the image shows 15V centre tap model. Be sure to get the 18V centre tapped model M7058A.
The transformer consists of two secondary winding and a primary side thermal fuse in series with the primary winding.
Itis the primary side of the transformer whihc needs some slight reforming of the niddle pin ( the pin connected to the the point where fuse and coil meet).
This way should the thermal fuse blow the transformer is still recoverable ( yes I know...but buggers cant be choosers).
The alternative is snip the pin off and the transformer slips into place like the proverbial in a sleeve.
On the secondary you will have to install a link between adjacent middle pins. In doing this make sure the linkis as close to the PCB as practicable. Make the link from a tinned bit of wire since You will need a dollop of solder to join the link to the hole where the centre tap of the old transformer used to be.
Thats it. HOWEVER... before soldering the transformer in place use a cable tie, position the transformer in place and tie it down making sure it is held in place by a cable tie.Only after You have secured it down with the cable tie apply solder and subsequently the shorting link.